UK Parliament and US Congress | Edexcel A-Level Politics
Updated: 6 hours ago
For Specification 9PL0
Edexcel A-Level Politics | Free Revision Notes
Estimated study time:Â 60 to 75 minutes
The UK Parliament and US Congress are both bicameral legislatures, but the balance of power between their two Houses is very different. This UK Parliament and US Congress A-Level Politics revision page compares the powers, strengths and weaknesses of the House of Commons, House of Lords, House of Representatives and Senate. It also examines how equal the chambers are and uses rational, cultural and structural approaches to explain the differences. The topic builds directly on constitutional differences and prepares you for comparing the executive-legislative relationship.
Learning Objectives 🎯
By the end of this revision page, you should be able to:
Compare the powers of the House of Commons, House of Lords, House of Representatives and Senate.
Explain the main strengths and weaknesses of each legislative chamber.
Analyse similarities in the legislative functions of Parliament and Congress.
Examine why the two chambers of Congress are more equal than the two Houses of Parliament.
Apply rational, cultural and structural approaches to similarities and differences between the legislatures.
Construct direct UK-US comparisons supported by appropriate political terminology.
Revision Notes đź“š
What does the specification require?
Edexcel requires students to compare and debate the UK and US legislative branches and their impact on politics and government.
You must understand:
the powers, strengths and weaknesses of each House
the extent to which the Houses are equal
the extent to which rational, cultural and structural approaches can account for similarities and differences
This means the comparison involves four chambers:
House of Commons
House of Lords
House of Representatives
Senate
The specification does not require you simply to describe Parliament and Congress separately. The important skill is explaining how and why the chambers differ.
This lesson draws on your earlier study of the UK chambers and Congressional structure.
Bicameralism in the UK and USA
Both Parliament and Congress are bicameral, meaning that the legislature consists of two chambers.
UK Parliament | US Congress |
House of Commons | House of Representatives |
House of Lords | Senate |
This creates an obvious structural similarity. In both systems, legislation normally has to be considered by two legislative chambers.
However, bicameralism operates differently because the relationship between the chambers is different.
The key distinction is:
Congress = relatively equal bicameralism
Parliament = unequal bicameralism
The Senate and House of Representatives have equal legislative status in passing ordinary legislation, whereas the House of Commons is constitutionally and politically stronger than the House of Lords.
Similar legislative powers of Parliament and Congress
Although their constitutional positions differ, the UK and US legislatures perform several similar legislative functions.
The 2025 mark scheme identifies important similarities:
proposing legislation
scrutinising proposed legislation
debating legislation
proposing amendments
voting on legislation
using committees to examine legislation
scrutinising the executive's involvement in legislation
carrying out a representative function through legislation
Introducing legislation
Members of both Congress and Parliament can participate in introducing legislation.
In both systems:
a proposal is introduced into a chamber
it is debated and scrutinised
amendments may be proposed
members vote on its progress
the other chamber also becomes involved before legislation is completed
The exact procedures differ, but the fundamental legislative function is similar.
This links to your detailed work on the UK law-making process and the US Congressional law-making process.
Debating and amending legislation
Members of all four chambers can contribute to the scrutiny of proposed legislation.
They may:
debate proposals
question those supporting a proposal
propose amendments
vote on whether legislation should progress
This gives both legislatures an important scrutiny function.
However, the significance of that scrutiny varies because the four chambers do not possess identical constitutional power.
Committee work
Both Parliament and Congress use committees as part of their legislative and scrutiny functions.
The 2025 mark scheme identifies a clear similarity: members of Congress, Members of Parliament (MPs) and members of the House of Lords can serve on committees where proposed legislation can be examined in greater depth.
The significance of committees differs between the two political systems, but committees strengthen both legislatures by allowing more detailed scrutiny than would be possible through debate in the full chamber alone.
Representation
The elected chambers in both countries have a representative role.
Members of the:
House of Commons
House of Representatives
Senate
may consider the interests of the voters they represent when deciding how to act.
The House of Lords is different because its members are not elected to represent geographical constituencies.
This affects both its strengths and weaknesses.
Lords cannot claim a direct electoral mandate, but their lack of electoral accountability may allow them greater independence when scrutinising legislation.
The 2023 mark scheme makes this contrast directly when comparing the Senate and Lords.
The House of Commons
The House of Commons is the dominant chamber of the UK Parliament.
Its importance is closely connected to:
its elected status
its democratic mandate
its exclusive powers
the ability of the Commons ultimately to prevail over the Lords in important legislative disputes
the fusion of executive and legislative power
Your earlier comparison of the UK chambers provides the detailed UK foundation for this comparison.
Strengths of the House of Commons
Democratic mandate
MPs are elected.
This gives the Commons democratic legitimacy and strengthens its claim to make final political decisions.
In contrast, the House of Lords is unelected.
The Commons can therefore argue that it should prevail where the two chambers disagree.
Legislative dominance over the Lords
The Commons is stronger because the Lords cannot permanently exercise an equal legislative veto.
The Parliament Acts 1911 and 1949Â allow legislation to be passed without the agreement of the Lords in specified circumstances.
This contrasts sharply with Congress, where neither chamber can ordinarily force legislation through against the wishes of the other.
Executive scrutiny
The Commons has mechanisms through which ministers can be held accountable.
These include:
questions to ministers
Prime Minister's Questions
select committees
opposition scrutiny
parliamentary debate
These connect with your study of Parliamentary scrutiny.
Weaknesses of the House of Commons
Executive dominance
The UK's fusion of powers can weaken legislative independence.
The government is drawn from Parliament and usually depends on support from MPs belonging to its party.
A government with a substantial Commons majority may therefore find it relatively easy to secure passage of its legislative programme.
By contrast, the US separation of powers means that a president cannot automatically rely upon Congress to approve their proposals.
The 2020 and 2022 mark schemes identify this as a central difference between Parliament and Congress.
Stronger party discipline
Party control can limit the independence of individual MPs.
UK governments can use:
party loyalty
the whip system
prospects of political advancement
to encourage MPs to support government policy.
Members of Congress are less directly controlled by the executive because the presidency and Congress are institutionally separate.
This does not mean that US parties have no whips. Examiner reports specifically warn against that misconception.
The House of Lords
The House of Lords is the weaker chamber of Parliament in formal legislative terms.
However, weaker does not mean powerless.
It can:
introduce legislation
debate bills
scrutinise legislation
propose amendments
delay some legislation
contribute to detailed legislative revision
scrutinise the executive
The 2023 mark scheme explicitly warns against treating the Lords as wholly subordinate, noting that it can introduce bills as well as amend and revise legislation.
Strengths of the House of Lords
Legislative scrutiny and revision
The Lords performs an important revising role.
Its members can examine proposals and propose amendments.
Its relative independence can strengthen scrutiny.
Independence from elections
Members of the Lords do not face constituency elections.
This means that they do not have to consider their own immediate re-election prospects when scrutinising legislation.
The 2023 mark scheme therefore suggests that Lords may sometimes act more independently than elected senators.
Potential independence from government
Because the Lords does not operate in exactly the same way as the Commons and members are not seeking constituency re-election, it can provide an additional source of legislative scrutiny.
This may be particularly valuable where the government dominates the House of Commons.
Weaknesses of the House of Lords
Lack of electoral mandate
The most obvious limitation is that the Lords is unelected.
This weakens its democratic legitimacy when challenging decisions made by the elected Commons.
Formal inferiority to the Commons
The Lords is not constitutionally equal to the Commons.
The Parliament Acts can allow the Commons to overcome opposition from the Lords.
The Lords is therefore unable to insist upon agreement in the same way that the Senate can.
Salisbury Convention
The Salisbury Convention also limits the circumstances in which the Lords should oppose legislation implementing commitments from the government's election manifesto.
This is another reason that unequal bicameralism exists in the UK.
The House of Representatives
The House of Representatives is one of two constitutionally important chambers of Congress.
The Constitution grants powers to Congress, including powers exercised concurrently by both chambers as well as exclusive powers belonging to particular Houses.
Strengths of the House of Representatives
Equal role in ordinary legislation
The House of Representatives and Senate must agree upon legislation.
The House therefore cannot normally be bypassed by the Senate when passing ordinary legislation.
This makes it structurally more powerful than the House of Lords.
Electoral accountability
Members of the House of Representatives are elected.
Its relatively frequent election cycle increases accountability to voters.
The 2020 and 2022 materials contrast this with the complete absence of elections to the House of Lords.
Constitutional powers
The House possesses powers assigned to it within the constitutional structure of Congress.
This strengthens its institutional position and distinguishes it from the Lords, whose powers have been limited over time.
Weaknesses of the House of Representatives
Dependence on agreement with the Senate
Equality can create weakness as well as strength.
Because legislation must secure the agreement of both congressional chambers, disagreement may prevent legislation from progressing.
This can contribute to gridlock.
Election pressures
Frequent elections can make representatives highly responsive to electoral considerations.
A representative may therefore have to balance:
national policy considerations
party pressures
constituency interests
their own prospects of re-election
This gives the House a clear representative role, but can also complicate law-making.
The US Senate
The Senate is the upper chamber of Congress, but unlike the House of Lords it is not a clearly subordinate second chamber.
The Senate is:
elected
constitutionally important
equal to the House of Representatives in ordinary legislation
given significant exclusive powers
This makes it substantially stronger than the House of Lords.
Strengths of the Senate
Equal legislative power
The most important point is that the Senate has an equal role with the House of Representatives in ordinary legislation.
A bill must reach an agreed form acceptable to both chambers.
The House cannot simply override the Senate.
In the UK, by contrast, the Commons can ultimately overcome Lords opposition using the Parliament Acts.
This is the clearest evidence that US bicameralism is more balanced than UK bicameralism.
Exclusive constitutional powers
The Senate also possesses powers that the House of Representatives does not share.
Provided mark schemes identify examples such as:
confirming presidential appointments
ratifying treaties
The 2021 mark scheme uses these powers to demonstrate why the Senate is substantially stronger than the House of Lords.
Electoral mandate
Senators have a state-wide electoral mandate.
This gives them democratic legitimacy and makes it more difficult for other institutions simply to disregard Senate opposition.
The 2021 mark scheme explicitly links this electoral mandate to the Senate's political influence.
Weaknesses of the Senate
Gridlock
The Senate's strength can itself contribute to legislative weakness.
Because Senate agreement is normally required alongside House agreement, conflict between the two chambers can prevent legislation progressing.
The 2023 mark scheme therefore contrasts the Senate's greater formal power with the danger of becoming caught in political gridlock.
Checks and balances
The Senate is powerful, but it does not operate without limitations.
Its position exists within the US constitutional system of:
separation of powers
checks and balances
bicameralism
This requires cooperation between political institutions.
The consequence is that strong institutional independence can make decisive legislative action harder.
Comparing the House of Commons and House of Representatives
These are both elected lower chambers, so they offer an important like-for-like comparison.
House of Commons | House of Representatives |
Elected chamber | Elected chamber |
Has a representative function | Has a representative function |
Participates in legislation and scrutiny | Participates in legislation and scrutiny |
Stronger than the Lords | Constitutionally equal in ordinary legislation with the Senate |
Closely linked to the executive through fusion of powers | Institutionally separate from the presidency |
Strong party discipline may increase executive influence | Executive has less direct control over members |
Similarity: representation
Both chambers consist of elected representatives.
Members therefore have incentives to take their constituencies into account.
This can be explained partly through the rational approach, since elected individuals may consider whether their decisions will improve their prospects of electoral support.
Difference: relationship with the executive
The Commons operates within fusion of powers.
The House of Representatives exists within separation of powers.
This is a powerful structural explanation for why the House may be more independent of the executive than the Commons.
Difference: relationship with the upper chamber
The Commons is dominant over the Lords.
The House of Representatives has no comparable general superiority over the Senate.
This makes the internal structure of Congress more balanced.
Comparing the Senate and House of Lords
This is one of the most useful comparisons for examination questions because they are both upper chambers but differ significantly.
US Senate | House of Lords |
Elected | Appointed |
State-wide electoral mandate | No direct electoral mandate |
Equal legislative status with House of Representatives | Weaker than Commons |
Cannot normally be overridden by House | Can be overcome through Parliament Acts |
Has exclusive constitutional powers | No equivalent range of exclusive constitutional powers |
Representative function | No geographical constituency role |
Electoral pressures may influence senators | Greater freedom from electoral pressures |
Powerful but can contribute to gridlock | Weaker but can provide independent scrutiny |
The 2023 mark scheme identifies these differences explicitly.
Are the House and Senate equal?
The two chambers of Congress are substantially equal in legislative terms.
Ordinary legislation generally requires agreement between both chambers.
Neither chamber can simply order the other to accept its version.
This creates strong bicameralism.
However, equality does not mean that the Houses possess exactly the same powers.
Each chamber also has particular constitutional roles.
The Senate, for example, has exclusive powers concerning appointments and treaties.
Therefore:
equal legislative status does not mean identical constitutional powers.
This is a useful distinction to make in an examination.
Are the Commons and Lords equal?
No.
The House of Commons is clearly the stronger chamber.
Reasons include:
its democratic mandate
its exclusive powers
the Parliament Acts
the Salisbury Convention
the greater political authority associated with an elected chamber
The Lords can still exercise influence through scrutiny and amendment, but it does not possess legislative equality with the Commons.
Therefore:
UK Parliament = asymmetrical bicameralism
US Congress = substantially symmetrical legislative bicameralism
Why is Congress more evenly balanced?
The difference can be traced to the constitutional systems studied in UK and US Constitutions.
The US system is characterised by:
codification
separation of powers
constitutionally specified powers
checks and balances
The UK system combines:
parliamentary sovereignty
fusion of powers
an elected Commons
an unelected Lords whose powers have been restricted
These constitutional foundations create very different legislative relationships.
Comparing legislative strengths
Congress is stronger in institutional independence
Separation of powers means members of Congress do not form part of the presidential executive.
The president cannot rely simply upon membership of Congress to control legislation.
This can strengthen congressional independence.
Parliament may be stronger in passing legislation efficiently
The same structural arrangement that weakens the independence of Parliament may also make law-making more efficient.
Where the UK government enjoys reliable Commons support, fusion of powers can help it secure legislation.
By contrast, separation of powers and equality between the congressional chambers can contribute to gridlock.
The key evaluative point is:
power and effectiveness are not necessarily the same thing.
Congress may have greater independence but greater difficulty producing legislation.
Parliament may be more influenced by the executive but more able to pass legislation efficiently.
Comparing legislative weaknesses
UK Parliament | US Congress |
Government may dominate Commons | Institutional conflict may create gridlock |
Lords lacks democratic mandate | Frequent elections may increase electoral pressures |
Strong party discipline may constrain MPs | Party, constituency and interest-group pressures may complicate agreement |
Unequal chambers weaken Lords' ability to block Commons | Equal chambers mean disagreement can prevent legislation altogether |
The 2020 mark scheme captures this contrast clearly: the Senate and House must cooperate, which can create gridlock, whereas the Commons can ultimately prevail over the Lords.
Checks on the legislative branches
Another difference arises from the constitutional framework surrounding the legislatures.
Presidential veto
In the USA, the president can veto legislation passed by Congress.
Congress can override a presidential veto, but this requires a two-thirds vote in both chambers.
This can significantly limit congressional legislative power.
The equivalent final UK stage, Royal Assent, is not an effective political veto on Parliament.
The 2020 mark scheme expressly identifies this difference.
⚠️ Do not confuse this with the majority normally required to pass ordinary US legislation.
Ordinary legislation does not generally require a two-thirds majority in Congress. Two-thirds is relevant to particular procedures such as overriding a presidential veto.
This distinction has repeatedly caused problems for candidates.
Judicial limitations
The US Supreme Court can declare congressional legislation unconstitutional.
This represents a significant constitutional check on Congress.
The UK Supreme Court does not possess an equivalent power to strike down primary legislation passed by the sovereign UK Parliament.
This difference again connects legislative power to the different constitutional structures of the countries.
Party unity and legislative power
Party organisation also affects how the legislatures operate.
In the UK, strong party discipline can:
make government legislative success more likely
reduce the independence of governing-party MPs
strengthen executive influence over Parliament
In Congress, members are less directly controlled by the executive.
Party remains important, but congressional members may also respond strongly to:
constituency
congressional caucuses
pressure groups
lobbyists
These factors are part of your earlier study of congressional voting behaviour.
Applying the structural approach
The structural approach is particularly useful for this comparison because it focuses on political institutions and formal processes.
Separation versus fusion of powers
A structural explanation can argue:
USA:Â Congress is separate from the executive.
UK:Â Parliament contains the political executive because ministers sit in Parliament.
Political consequence:Â Congress has greater institutional independence from the executive, whereas a UK government with a reliable parliamentary majority may exercise greater influence over legislation.
This was the most common successful theoretical approach identified by the 2019 examiner report.
Equality of the chambers
Another structural explanation focuses on bicameralism.
Congress:Â legislation requires agreement between two constitutionally powerful chambers.
Parliament:Â the Commons is constitutionally stronger than the Lords.
Therefore:
Congress contains stronger internal legislative checks
Parliament can be more efficient
Congress is more vulnerable to gridlock
the Lords is less able to prevent legislation supported by the Commons
The formal structure produces the difference.
Applying the rational approach
The rational approach focuses on individuals choosing actions they believe will produce beneficial outcomes.
This can help explain legislative behaviour.
Elected legislators
An MP, representative or senator may consider:
constituency preferences
re-election
promotion
party support
political influence
when deciding how to act.
The 2025 mark scheme explicitly notes that members of Congress and MPs may vote in ways they believe will benefit their constituents, particularly as elections approach.
This can be expressed as:
electoral incentive → individual choice → voting behaviour
Lords
Members of the Lords face different incentives because they do not seek constituency re-election.
Their rational calculations may therefore differ from those of elected politicians.
They may have less reason to modify legislative behaviour in response to short-term electoral pressure.
Senators and political influence
The 2021 mark scheme also suggests a rational comparison based on individual political ambition and influence.
Senators may possess substantial individual political influence, while members of the Lords operate within a very different system without the same electoral career incentives.
Applying the cultural approach
The cultural approach focuses on shared ideas, beliefs and values within political groups.
It can help explain differences that cannot be understood through formal rules alone.
Party culture
UK parliamentary politics traditionally places substantial emphasis on party loyalty.
This contributes to MPs often supporting the party line.
In Congress, political culture gives individual members greater scope to balance party positions against constituency and other pressures.
The formal structure is important, but shared expectations about how legislators should behave also matter.
Perceptions of the upper chambers
The 2021 mark scheme provides a particularly clear cultural comparison:
the Senate is perceived as a prestigious chamber within the US political system
the House of Lords is often criticised as outdated and in need of reform
These perceptions can affect the authority attached to each institution.
A cultural explanation therefore focuses not just on the legal powers of a chamber but on how political groups and wider society understand its legitimacy and role.
Comparing all three approaches
Consider the greater power of the Senate compared with the House of Lords.
Structural explanation
The Constitution grants the Senate equal legislative status and specific exclusive powers, while the Lords is formally weaker than the Commons.
Cause:Â institutional design.
Rational explanation
Elected senators have incentives connected to voters, political careers and influence, while Lords do not face constituency re-election.
Cause:Â individual calculations.
Cultural explanation
The Senate carries substantial prestige as an elected constitutional chamber, while the Lords faces continuing questions about its unelected status.
Cause:Â political beliefs and expectations surrounding the institutions.
The theories are therefore not competing definitions. They provide different explanations for the same political comparison.
Which approach is most useful?
For legislative powers, structural theory is often particularly effective.
Many differences arise directly from:
separation versus fusion of powers
constitutional powers
equal versus unequal bicameralism
the Parliament Acts
the relationship between legislature and executive
However, the examiner reports make clear that candidates should choose whichever theory best supports their actual comparison.
There is no requirement to use all three in a Section B answer.
How to build a comparative-theory paragraph
A strong paragraph should follow this chain:
1. Establish a direct comparison
The Senate has greater legislative power than the House of Lords because the Senate is constitutionally equal to the House of Representatives, whereas the Lords is subordinate to the Commons.
2. Explain the mechanism
A bill must receive the agreement of both congressional chambers, while the Commons can ultimately overcome Lords opposition using the Parliament Acts.
3. Explain the political consequence
The Senate can therefore prevent legislation from progressing, while the Lords cannot exercise the same permanent legislative veto.
4. Apply theory
This difference is best explained structurally because the formal constitutional rules create relatively equal bicameralism in Congress but unequal bicameralism in Parliament.
The theory has now explained the comparison rather than being bolted onto it.
Legislative powers versus other powers
Be very careful about the precise focus of an examination question.
If a question asks specifically about legislative powers, concentrate on powers connected with making legislation.
This includes:
introducing bills
debating bills
amending bills
committee scrutiny
voting
the relationship between the two chambers during law-making
Some congressional powers are important but are not legislative powers in the narrow sense.
The 2019 examiner report found that candidates sometimes discussed matters such as appointments or impeachment when asked specifically to compare legislative powers. Those responses did not answer the question set.
A comparison grid for revision
Factor | UK Parliament | US Congress | Main explanation |
Bicameralism | Commons dominant over Lords | Chambers broadly equal legislatively | Structural |
Executive relationship | Fusion of powers | Separation of powers | Structural |
Legislative efficiency | Can be high with government majority | Can be limited by inter-chamber conflict | Structural |
Party discipline | Generally stronger | Generally weaker executive control | Cultural / structural |
Electoral incentives | Commons elected, Lords unelected | Both chambers elected | Rational |
Upper-house legitimacy | Lords has no direct mandate | Senate has state-wide mandate | Cultural / structural |
Scrutiny | Both Houses scrutinise | Both Houses scrutinise | Structural similarity |
Gridlock | Less likely between chambers because Commons can prevail | More likely because both chambers must agree | Structural |
Representation | Commons represents constituencies | House and Senate represent electorates | Rational / structural |
Executive veto | Royal Assent not an effective political veto | Presidential veto can block legislation | Structural |
Connecting this topic to later learning
The relative independence of Congress and Parliament cannot be fully understood without examining their relationship with political executives.
Your next comparative lesson, UK and US executives, develops this by comparing:
the UK Prime Minister and US President
their powers
their relationships with their legislatures
the extent to which each can be held accountable
Your understanding of Congressional oversight will be particularly useful when making these comparisons.
Hints from the Examiner Reports đź’ˇ
Examiner hint:Â Make direct comparisons rather than writing a US section followed by a UK section.
The 2019 and 2022 reports consistently found that stronger candidates organised their answers around comparative factors and explicitly connected the countries.A strong structure is:
Factor 1: upper chambers
US Senate → direct contrast → House of Lords → consequence.
Then move to the next factor.
Examiner hint:Â Compare like with like.
Do not compare one unrelated power of the Senate with a completely different feature of the Lords. The strongest responses identify a common criterion, such as legislative equality, mandate or scrutiny, and apply it to both chambers.
Examiner hint:Â Read every word of the question.
The 2019 examiner report found that some candidates answered a question about legislative powers by discussing unrelated congressional powers. Some otherwise knowledgeable responses therefore received little or no credit.
Underline the precise focus:
legislative powers
is different from:
powers
which is different again from:
checks and balances.
Examiner hint:Â Integrate comparative theory rather than bolting it onto a paragraph.
The 2019 report found structural theory particularly effective for comparing Parliament and Congress, especially through separation and fusion of powers. Strong candidates used the theory to explain why the difference existed.
Weak:
This is structural theory.
Strong:
Structural theory explains this difference because the US Constitution requires agreement between two powerful chambers, whereas the UK's constitutional arrangements allow the Commons ultimately to prevail over the Lords.
Examiner hint:Â You need at least one comparative approach for the compulsory theory question.
Provided mark schemes state that an answer with no comparative theory cannot access Level 4. You do not need all three approaches.
Examiner hint:Â Use precise specialist terminology.
The 2022 examiner report noted that stronger answers used accurate vocabulary such as veto, gridlock and unconstitutional, rather than vague expressions such as saying an institution can simply "throw out" legislation.
Examiner hint:Â Give both countries proper attention.
Top comparative responses need evidence and developed knowledge from both systems. Examiners have repeatedly criticised answers that rely heavily on US knowledge while treating the UK superficially.
Examiner hint:Â A 12-mark comparative response does not need a lengthy essay-style introduction or conclusion.
Use the available time on developed, directly comparative analytical paragraphs.
Common Mistakes ⚠️
Mistake: Saying the House of Lords has no legislative power
Why this is incorrect: The Lords can introduce, debate, scrutinise and amend legislation.
Its powers are more limited than those of the Commons, but it is not powerless.
How to improve: Write:
The Lords is a weaker legislative chamber than the Commons, rather than claiming that it has no legislative power.
Mistake: Treating the Senate and House of Lords as equivalent simply because both are upper chambers
Why this is incorrect: The Senate is elected, has an electoral mandate, possesses specific constitutional powers and is equal to the House of Representatives in ordinary legislation.
The Lords is appointed and formally weaker than the Commons.
How to improve: Use "upper chamber" as the starting point for comparison, not as evidence that they possess the same power.
Mistake: Saying the US Senate is more powerful than the House of Representatives in all respects
Why this is incorrect: The Senate has important exclusive powers, but both chambers are needed for ordinary legislation.
The key point is that they possess equal legislative status while also having some different exclusive powers.
How to improve: Distinguish between:
equal concurrent legislative power
different exclusive constitutional powers
Mistake: Saying ordinary US legislation requires a two-thirds majority
Why this is incorrect: The examiner reports repeatedly identify this as a factual error.
A two-thirds majority is relevant to particular constitutional procedures, such as overriding a presidential veto. It is not the normal requirement for passing ordinary legislation.
How to improve: Do not automatically associate "Congress" with "two-thirds majority". Identify the specific procedure first.
Mistake: Saying there is no party whip system in Congress
Why this is incorrect: Congress does have party whips.
The difference is that party discipline and executive control operate differently from the UK.
How to improve: Write that the UK whip system and party discipline are generally stronger, rather than claiming US whips do not exist.
Mistake: Confusing legislative power with other congressional powers
Why this is incorrect: A question about legislative power is specifically about participation in making law.
The 2019 examiner report found candidates discussing powers such as executive appointments when these were not relevant to the wording of the question.
How to improve: For legislative powers, think:
introduce → debate → scrutinise → amend → vote → pass legislation
Mistake: Assuming that a stronger legislature must always produce more legislation
Why this is incorrect: Congressional independence can produce gridlock because multiple powerful institutions must agree.
The Commons may be less independent of the executive but more effective at passing a government's legislative programme.
How to improve: Distinguish between:
institutional power
and
legislative efficiency.
Mistake: Naming comparative theory without explaining causation
Why this is incorrect:
"Congress is more powerful because of structural theory"
does not explain the relationship.
How to improve: Identify the actual structure:
Congress is more independent because separation of powers prevents the executive from being institutionally fused with the legislature, whereas UK ministers operate within Parliament.
Mistake: Writing separate mini-essays on Britain and America
Why this is incorrect: AO2 rewards comparative analysis.
Two descriptions do not automatically create comparison.
How to improve: Build each paragraph around a single criterion:
equality of chambers
mandate
legislative powers
executive influence
gridlock
party discipline
Then analyse both countries within the same paragraph.
Exam-Style Questions ✍️
Question 1
Define bicameralism. (2 marks)
reveal mark scheme and indicative content
Award up to 2 marks for:
identifying a legislature with two chambers or Houses
demonstrating understanding that both chambers form part of the same legislature
Question 2
Explain one reason why the House of Commons is more powerful than the House of Lords. (4 marks)
reveal mark scheme and indicative content
Award up to 4 marks for one developed reason.
Indicative answer:
The Commons has greater power because it is the elected chamber and therefore possesses a democratic mandate that the appointed Lords lacks. Its dominance is reinforced by the Parliament Acts, which can allow legislation to pass despite Lords opposition. The Lords can scrutinise and delay legislation but does not possess equal legislative power.
Question 3
Explain one important similarity in the legislative powers of the US Congress and UK Parliament. (4 marks)
reveal mark scheme and indicative content
Award up to 4 marks for one developed similarity.
Possible answers include:
members of both legislatures can introduce legislation
both debate and scrutinise bills
both can propose amendments
both use committees
members vote on legislation
both legislatures scrutinise the executive's role in legislation
A strong response explains the similarity rather than merely identifying it.
Question 4
Study the following comparison.
Legislature A | Legislature B |
Both chambers must agree before ordinary legislation can progress. | The elected lower chamber can ultimately overcome opposition from the upper chamber. |
Both chambers are elected. | Only the lower chamber is elected. |
The executive is institutionally separate from the legislature. | Members of the executive sit within the legislature. |
Analyse two ways in which the legislative structures shown could produce different political outcomes. (6 marks)
reveal mark scheme and indicative content
Award up to 6 marks.
Indicative points:
Equality of chambers
Legislature A resembles Congress because both chambers must agree. This creates strong internal checks but may also produce gridlock.
Legislature B resembles Parliament because its lower chamber can ultimately prevail, making legislation potentially easier to complete but weakening the upper chamber.
Executive relationship
Legislature A resembles Congress because separation of powers gives legislators greater institutional independence from the executive.
Legislature B resembles Parliament because fusion of powers gives the executive greater opportunities to influence legislative behaviour.
Credit developed causal analysis.
Question 5
Examine the differences between the US Senate and the House of Lords. (12 marks)
reveal mark scheme and indicative content
Indicative content could include three like-for-like differences.
Mandate
Senate is elected.
Lords is appointed.
Senators have electoral legitimacy and accountability.
Lords may have greater independence from election pressures.
Legislative status
Senate is equal to the House of Representatives in ordinary legislation.
Lords is weaker than Commons.
Commons may ultimately use Parliament Acts.
Senate agreement cannot simply be bypassed.
Powers
Senate has explicit exclusive constitutional powers.
Lords does not possess an equivalent range.
Lords nevertheless remains significant in legislative scrutiny and revision.
For the highest marks, comparisons should be direct and developed rather than presenting separate descriptions.
Question 6
Examine the similarities in the legislative powers of the US Congress and UK Parliament. (12 marks)
reveal mark scheme and indicative content
Indicative content includes:
Introducing legislation
Members of Congress, MPs and members of the Lords can participate in introducing legislation.
Debate and amendment
All chambers debate legislation, propose amendments and vote.
Committee scrutiny
Both systems use committees for detailed examination of legislation.
Executive scrutiny
Both legislatures scrutinise executive involvement in law-making, although the institutional relationship differs.
Representation
Elected members in both countries may use legislative decisions to represent constituents, although this does not apply in the same way to the appointed Lords.
The question asks for similarities, so differences should only be used where necessary to develop the similarity rather than becoming the focus.
Question 7
Analyse how the US Congress can be considered more independent of the executive than the UK Parliament. In your answer you must consider the relevance of at least one comparative theory. (12 marks)
reveal mark scheme and indicative content
A strong response might use:
Separation versus fusion of powers
Congress exists separately from the presidency.
Ministers sit within Parliament in the UK.
Structural theory explains greater congressional institutional independence.
Party and executive influence
UK governments may use strong party discipline and prospects of advancement to encourage MPs' loyalty.
A US president cannot offer congressional members Cabinet office while they remain in Congress.
This can make Commons members more responsive to government leadership.
Checks on independence
Greater independence does not necessarily mean greater effectiveness.
Congress may experience gridlock.
A UK government with reliable Commons support may secure its legislative programme more efficiently.
Comparative theory should be integrated into the explanation.
Question 8
Analyse why the two Houses of Congress are more equal than the two Houses of the UK Parliament. In your answer you must consider the relevance of at least one comparative theory. (12 marks)
reveal mark scheme and indicative content
Indicative content:
Ordinary legislation
House and Senate must both agree.
Commons can ultimately overcome Lords resistance.
Structurally, US bicameralism therefore creates more equal legislative chambers.
Constitutional basis
US chamber powers are defined within the constitutional structure.
Lords powers have been restricted, including through the Parliament Acts.
This produces stronger formal equality in Congress.
Mandate
Both congressional chambers are elected.
Only the Commons is elected in the UK.
The Senate therefore has stronger democratic legitimacy than the Lords when challenging the lower chamber.
Cultural approach
The Senate possesses substantial political prestige as an elected constitutional chamber.
The Lords faces continuing questions about the legitimacy of an appointed upper chamber.
Rational approach
Representatives and senators must consider electoral incentives.
Lords do not face constituency re-election, creating different motivations and forms of accountability.
The strongest conclusion is that structural factors provide the clearest explanation of chamber equality, because formal constitutional rules require cooperation between House and Senate while giving the Commons ultimate superiority over the Lords. Rational and cultural factors help explain how members behave within those structures.
Answers and mark scheme
Question 1
Award up to 2 marks for:
identifying a legislature with two chambers or Houses
demonstrating understanding that both chambers form part of the same legislature
Question 2
Award up to 4 marks for one developed reason.
Indicative answer:
The Commons has greater power because it is the elected chamber and therefore possesses a democratic mandate that the appointed Lords lacks. Its dominance is reinforced by the Parliament Acts, which can allow legislation to pass despite Lords opposition. The Lords can scrutinise and delay legislation but does not possess equal legislative power.
Question 3
Award up to 4 marks for one developed similarity.
Possible answers include:
members of both legislatures can introduce legislation
both debate and scrutinise bills
both can propose amendments
both use committees
members vote on legislation
both legislatures scrutinise the executive's role in legislation
A strong response explains the similarity rather than merely identifying it.
Question 4
Award up to 6 marks.
Indicative points:
Equality of chambers
Legislature A resembles Congress because both chambers must agree. This creates strong internal checks but may also produce gridlock.
Legislature B resembles Parliament because its lower chamber can ultimately prevail, making legislation potentially easier to complete but weakening the upper chamber.
Executive relationship
Legislature A resembles Congress because separation of powers gives legislators greater institutional independence from the executive.
Legislature B resembles Parliament because fusion of powers gives the executive greater opportunities to influence legislative behaviour.
Credit developed causal analysis.
Question 5
Indicative content could include three like-for-like differences.
Mandate
Senate is elected.
Lords is appointed.
Senators have electoral legitimacy and accountability.
Lords may have greater independence from election pressures.
Legislative status
Senate is equal to the House of Representatives in ordinary legislation.
Lords is weaker than Commons.
Commons may ultimately use Parliament Acts.
Senate agreement cannot simply be bypassed.
Powers
Senate has explicit exclusive constitutional powers.
Lords does not possess an equivalent range.
Lords nevertheless remains significant in legislative scrutiny and revision.
For the highest marks, comparisons should be direct and developed rather than presenting separate descriptions.
Question 6
Indicative content includes:
Introducing legislation
Members of Congress, MPs and members of the Lords can participate in introducing legislation.
Debate and amendment
All chambers debate legislation, propose amendments and vote.
Committee scrutiny
Both systems use committees for detailed examination of legislation.
Executive scrutiny
Both legislatures scrutinise executive involvement in law-making, although the institutional relationship differs.
Representation
Elected members in both countries may use legislative decisions to represent constituents, although this does not apply in the same way to the appointed Lords.
The question asks for similarities, so differences should only be used where necessary to develop the similarity rather than becoming the focus.
Question 7
A strong response might use:
Separation versus fusion of powers
Congress exists separately from the presidency.
Ministers sit within Parliament in the UK.
Structural theory explains greater congressional institutional independence.
Party and executive influence
UK governments may use strong party discipline and prospects of advancement to encourage MPs' loyalty.
A US president cannot offer congressional members Cabinet office while they remain in Congress.
This can make Commons members more responsive to government leadership.
Checks on independence
Greater independence does not necessarily mean greater effectiveness.
Congress may experience gridlock.
A UK government with reliable Commons support may secure its legislative programme more efficiently.
Comparative theory should be integrated into the explanation.
Question 8
Indicative content:
Ordinary legislation
House and Senate must both agree.
Commons can ultimately overcome Lords resistance.
Structurally, US bicameralism therefore creates more equal legislative chambers.
Constitutional basis
US chamber powers are defined within the constitutional structure.
Lords powers have been restricted, including through the Parliament Acts.
This produces stronger formal equality in Congress.
Mandate
Both congressional chambers are elected.
Only the Commons is elected in the UK.
The Senate therefore has stronger democratic legitimacy than the Lords when challenging the lower chamber.
Cultural approach
The Senate possesses substantial political prestige as an elected constitutional chamber.
The Lords faces continuing questions about the legitimacy of an appointed upper chamber.
Rational approach
Representatives and senators must consider electoral incentives.
Lords do not face constituency re-election, creating different motivations and forms of accountability.
The strongest conclusion is that structural factors provide the clearest explanation of chamber equality, because formal constitutional rules require cooperation between House and Senate while giving the Commons ultimate superiority over the Lords. Rational and cultural factors help explain how members behave within those structures.
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