Assess performance and payment obligations
Use the entire-performance rule and its exceptions without treating every defect as either full completion or total non-payment.
Exam scope and assessment notes
A Level · section 3.3.1. Original educational scenarios about the law of England and Wales, checked on 14 October 2026. Model answers are formative reasoning, not advice about a real dispute, Cambridge marks or predicted grades. Read the exact statute, case and exam-year source where a rule is disputed or changes. A larger annotated authority bank, full unseen papers and specialist law-teacher review remain outstanding.
Before you begin
- Read a short source carefully and separate its rule from the facts
- Explain which element a fact supports and what is still uncertain
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
What should a legal problem answer connect?
What you will learn
- Explain strict/entire and substantial performance
- Apply partial, divisible, prevented, tendered and vicarious performance
Read the payment condition
An entire obligation may require completed performance before the agreed payment falls due, illustrated by Cutter v Powell. That is not a rule that every agreement has one indivisible payment condition. Divisible stages can create separate payment rights. Substantial performance may allow the price less a proper allowance for defects, as in Hoenig; serious defects can defeat substantial performance, as Bolton illustrates.
Voluntary acceptance of partial performance can support reasonable remuneration, but having no real choice about work left on one's property is not necessarily voluntary acceptance, as Sumpter illustrates. Preventing the other party's completion may create a different remedy; the preventer cannot simply invoke its own obstruction as if nothing else occurred.
Check how performance is provided
A valid tender of performance can affect the consequences of refusal, but offering money does not itself erase an unpaid debt. Time is not automatically a condition in every contract: the terms, context and applicable rules determine its importance. Personal skill obligations may not be delegated as if any substitute is equivalent.
Vicarious performance means the promised work is carried out through another; it does not automatically release the contracting promisor from responsibility. Distinguish delegation of work, assignment of rights and transfer of obligations. Use the agreement's actual completion, quality, timing and personnel requirements before calculating payment.
Sources for this lesson
Pause and explain
Does substantial performance necessarily mean every defect is ignored?
Worked example
A substantially performed £1,000 job has £100 of remediable defects, with substantial performance and the allowance stipulated. Calculate the simple payment position.
Show the worked solution
- Substantial performance permits the stipulated price claim.
- Deduct the proper £100 allowance.
- Do not label the whole job unpaid or flawless.
Answer On the stipulated substantial-performance facts, the simple amount is £900. The deduction recognises defective work without treating completion as either perfect or entirely worthless; real valuation and contractual issues need their own evidence.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Guided: Calculate the stipulated price less defects.
Give me a hint
Use the given allowance once.
Compare my reasoning
- Start with £1,000.
- Deduct £100.
- Explain why the allowance matters.
The simple amount is £900 on the supplied substantial-performance assumptions. The deduction compensates for the stipulated defects; the exercise does not establish substantial performance for every incomplete job.
Look for these in your work
- Calculates correctly
- Uses stipulation
- Preserves qualification
Independent: Work is abandoned on an owner's land and cannot practically be returned. Does keeping it automatically prove voluntary acceptance?
Give me a hint
Practical lack of choice matters.
Compare my reasoning
- Identify abandonment.
- Assess whether acceptance was genuinely voluntary.
- Check a proper remuneration basis.
Retaining work that cannot practically be returned does not automatically show voluntary acceptance of partial performance. A remuneration claim requires its own contractual or other legal basis rather than an inference from unavoidable retention.
Look for these in your work
- Uses circumstances
- Tests voluntary choice
- Requires legal basis
Application: A contractor employs another worker to perform the job and claims it is no longer responsible. Explain the distinction.
Give me a hint
Delegating work does not necessarily transfer the promise.
Compare my reasoning
- Identify the original contractual promisor.
- Check whether delegation is permitted.
- Separate performance through another from release.
The original contractor ordinarily remains responsible for its promised performance unless obligations are validly transferred or released. Permitted use of another worker is vicarious performance, not automatic removal of contractual liability.
Look for these in your work
- Names promisor
- Checks permission
- Separates release
Common mistakes
- Applying an entire obligation to every bargain
- Calling forced retention voluntary acceptance
- Confusing delegation with release
What can you explain now?
Does substantial performance necessarily mean every defect is ignored?
Compare with the explanation
No
A proper allowance for defects can remain due even where substantial performance supports payment.
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Make it stick
Does substantial performance necessarily mean every defect is ignored?
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.