ACCT90009 Chap.11 Managing Cost, Quality and Time

Managing Cost, Quality and Time

Standard canon anchored to Week 11. Classify prevention, appraisal, internal and external failure; decompose cycle time; trace defects, queues and bottlenecks; and evaluate system customer value rather than local cost.

Detailed chapter study map

AskSia Library · ACCT90009 · Strategic Cost Management · University of Melbourne QUALITY AND TIME Week 11 · standard canon STANDARD CANON Manage the system, not one cost line Prevention, appraisal, failure, cycle time and customer value The official Week 11 topic is Cost Management in Quality and Time.

This chapter presents standard accounting canon. Quality and time are economic drivers: defects consume rework and warranty resources, delays consume capacity and customer trust, and rushed local savings can transfer cost downstream. Strategic management connects prevention, flow and customer outcome. Quality-cost relationship Prevention and appraisal generally rise while failure cost falls.

The total-cost shape is contextual; the figure marks a decision region, not a universal guaranteed

optimum. Original schematic. Quality is conformance and fitness Conformance asks whether output meets specification; design quality asks whether the specification creates customer value. Perfectly conforming output can still solve the wrong problem.

Measures should connect internal defects to customer experience and lifecycle consequences. Time is a resource and an outcome Waiting and rework consume capacity without creating value. Shorter response can increase willingness to pay and reduce working capital, but speed gained by skipping controls can raise failure. Analyse the full stream. !

Lowest visible cost can be highest system cost Cutting training, maintenance or validation may improve current expense and worsen defects, delay and churn. Trace the causal chain before recommending. Prevention creates value

when it removes failure and delay rather than merely adding another control.

Quality–time principle {PG} · asksia.ai/explore AskSia Library · ACCT90009 · Strategic Cost Management · University of Melbourne QUALITY COST Cost of quality Prevention, appraisal, internal and external failure Classify to redesign, not to celebrate totals Category Purpose/event Examples Strategic question Prevention Avoid defects Design review, training, process control Does it remove a failure trigger?

Appraisal Detect before release Testing, inspection, audit Can prevention reduce dependence? Internal failure Defect before customer Scrap, rework, retest, delay Why was it created? External failure Defect reaches customer Warranty, refund, complaint, churn What trust/lifetime value was lost? A cost-of-quality report makes failure visible and directs improvement.

Classification can

be ambiguous: test automation may be appraisal, while design validation may prevent defects. Choose the label that reflects the causal purpose and keep policies consistent. The objective is not shifting cost between categories; it is lowering failure and total lifecycle burden.

External failure is often understated Accounting systems capture refunds and warranty better than lost trust, negative referrals or future churn. Quantify only with credible evidence and show ranges. Do not claim speculative lifetime loss as exact, but do not assume unrecorded consequences are zero. Prevention needs verification More prevention spending is not automatically effective.

Link each activity to defect mechanism, measure leading control performance and track downstream failure. Remove redundant checks after process capability

improves. P11.1 Classification Answer included Inspection finds a defect before shipment. Category? Answer. Inspection is appraisal; correcting the discovered defect is internal failure. P11.2 External Answer included Refund recorded but churn unmeasured.

Treat churn as zero? Answer. No. Estimate cautiously or disclose as unquantified risk with a plan to improve evidence.

{PG} · asksia.ai/explore AskSia Library · ACCT90009 · Strategic Cost Management · University of Melbourne QUALITY ECONOMICS Quality economics Find the failure mechanism and prevention leverage Expected cost, severity, probability and control EXPECTED-LOSS VIEW Expected failure cost = probability of failure × consequence per failure, adjusted for exposure and timing. Use ranges when probability or consequence is uncertain.

Expected cost helps compare prevention with

failure exposure, but rare severe outcomes need risk judgement beyond averages. Safety, compliance and trust can impose constraints. Map defect creation, detection and escape points, then invest where a control reduces the most consequential pathway. Leading and lagging measures Failure rates and complaints are lagging.

Process capability, validation coverage, maintenance compliance and training are leading. A balanced dashboard avoids waiting for customers to discover whether prevention failed. Cost transfer across functions Procurement saving can raise production scrap; production speed can raise service failure; inspection can protect customers while masking unstable processes.

Assign improvement to the end-to-end value stream rather than allowing each function to optimise its own budget.

Failure pathway Leading control Lagging outcome Material

defect Supplier capability Scrap/warranty Assembly error Poka-yoke/training Rework/returns Software release Automated validation Incidents/churn Service handoff Checklist/data completeness Repeat contacts/delay ✓ Prioritise by leverage Estimate how much a prevention action changes failure probability or severity, not merely how much it costs.

Pilot where evidence is weak. P11.3 Expected cost Answer included 2% failure × $500 consequence over 1,000 units? Answer. Expected quantified failure cost $10,000, before tail risk and unmeasured trust effects. P11.4 Constraint Answer included Expected fine is lower than compliance cost. Violate? Answer. No. Legal/ethical requirements are constraints, not merely expected-cost choices.

{PG} · asksia.ai/explore AskSia Library · ACCT90009 · Strategic Cost Management · University of Melbourne TIME MEASURES Time measures Processing is only

one part of elapsed time Inspection, movement, waiting and rework Time stream and rework loop Only part of elapsed time transforms the offering. Mapping inspection, movement, waiting and rework reveals delays and quality loops that local cost reports can hide.

Original schematic. TIME DECOMPOSITION Cycle/throughput

What this chapter covers

• 01

  Cost of quality

• 02

  Expected failure and prevention

• 03

  Cycle time and bottlenecks

• 04

  Value-chain quality and balanced measures

AskSia-authored practice weighting (not an official mark scheme): Validation investment

Key terms

Prevention cost

Cost to avoid defect creation.

Cycle time

Processing, inspection, movement, waiting and rework time.

Managing Cost, Quality and Time FAQ

Exam move

Map failure and time streams, quantify only supported effects, and pair cost with quality, flow and customer outcomes in every recommendation.

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