Investigate linked variances and improve decisions
Combine variance evidence, test causes, improve future standards and make a recommendation that includes financial and non-financial factors.
Cambridge International AS & A Level Accounting 9706, 2026–2028 syllabus, Version 2. Topic 4.2 teaches standard costing, the listed material, labour, fixed-overhead and sales variances, their causes and relationships, and evidence-based business decisions. Practice is self-checked, not an official Cambridge grade. Full timed Papers 1–4 and human subject-teacher review remain outstanding.
Before you begin
- Use Topic 2.1–2.2 cost behaviour, contribution and absorption-costing ideas. In each question, identify the period, actual output, budget and standard before calculating a variance.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which information can help explain a variance?
What you will learn
- Relate variance causes without assuming them
- Use results to improve standards and budgets
- Make a supported business recommendation
Build a cause-and-effect investigation
Material price and usage, labour rate and efficiency, fixed-overhead volume sub-variances, and sales price and volume can be related. For example, a discount may increase volume; overtime may raise labour rate while meeting a demand peak; cheaper inputs may or may not affect waste.
First check calculations and bases. Then compare actual price, input quantities, hours, output, sales, quality and timing with the standard. Separate a plausible explanation from evidence that supports it, and distinguish controllable from external causes.
Turn investigation into action
Use recurring, well-supported findings to revise future budgets or standards and improve budget preparation and business performance. A standard should not be changed simply to erase an unfavourable result; record the new assumptions and effective period so later comparisons remain meaningful.
A recommendation should state the evidence, expected benefit, cost and risk, then identify relevant non-financial factors such as product quality, safety, staff welfare, delivery, customer demand and environmental impact. Set a follow-up measure to see whether the action worked.
Pause and explain
A cost standard is lowered after an adverse result but no process or price evidence has changed. What is the risk?
Worked example
A promotion caused a $2,400 adverse sales-price variance and a $3,100 favourable sales-volume contribution variance. State the net standard profit effect and two checks before repeating it.
Show the worked solution
- Net = $3,100 favourable − $2,400 adverse = $700 favourable.
- The result is based on the supplied standard contribution comparison, not necessarily actual final profit.
- Check extra promotion costs, capacity, customer retention, stock and whether the volume is repeatable.
Answer The two supplied effects net to $700 favourable on the standard profit basis. Before repeating the promotion, check additional selling costs and whether demand, capacity and customer retention support it.
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.
A factory has a favourable price variance, adverse usage variance and rising defect returns. Give a short investigation plan.
Give me a hint
Connect the purchasing and production records, then check product outcomes.
Compare my reasoning
- Verify the standard and calculate each variance on its correct quantity basis.
- Compare material specification, supplier batches, waste, rework and output records.
- Review defect returns and customer evidence before deciding whether the price saving is worthwhile.
Check the calculations, material grade, supplier batch, usage, scrap and defects. Decide on the source and specification using total cost and customer-quality evidence, not the price variance alone.
Look for these in your work
- Calculation bases checked
- Purchasing and process evidence included
- Customer quality included
A month shows fixed-overhead capacity variance $8,000 adverse and efficiency variance $2,500 favourable. What is the volume variance and what two operating questions should management ask?
Give me a hint
Add the sub-variances using their favourable/adverse directions.
Compare my reasoning
- $8,000 adverse offset by $2,500 favourable gives $5,500 adverse volume.
- Ask why actual operating hours were below budget, such as downtime or demand.
- Ask whether hours per unit improved and whether quality, maintenance and output were protected.
$5,500 adverse fixed-overhead volume variance. Investigate capacity shortfall and the efficiency/quality evidence separately.
Look for these in your work
- Net volume correct
- Capacity cause investigated
- Efficiency and quality separated
A production team meets a favourable standard-cost target by skipping safety training and using thinner material. Recommend how the business should change its performance review.
Give me a hint
Retain cost measures but add quality, safety and workforce measures to the decision.
Compare my reasoning
- Report price, usage, rate and efficiency variances with the underlying output and cost basis.
- Include product specification, defect, safety and training evidence in the review.
- Set standards that reflect approved operating requirements and investigate deviations before rewarding cost savings.
Do not reward the cost result alone. Include safety, training, specification and defect measures, and use standards that preserve required quality and safe work.
Look for these in your work
- Cost evidence retained
- Non-financial measures added
- Recommendation aligned with safe standards
Common mistakes
- Treating net variances as proof of actual profit or causation
- Updating standards to hide poor results
- Ignoring safety, quality, staff or customer effects
What can you explain now?
What is a sound use of a persistent, evidence-supported variance?
Compare with the explanation
Investigate its cause and improve future budgets or standards where assumptions have changed
Use evidence to improve assumptions and action; do not change a standard merely to conceal performance.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
Name two financial and two non-financial checks to include in a variance-based recommendation.
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.