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Cost of Quality (CoQ)

The total expenditure over the product's entire life tied to quality: what you spend to prevent defects, to check and verify compliance, and what it costs when requirements are not met (both internal and external failures).

Key Points

  • CoQ spans the full life cycle: development, delivery, operations, support, and end-of-life.
  • It includes cost of conformance (prevention + appraisal) and cost of nonconformance (internal + external failure).
  • Investing in prevention and appraisal typically lowers failure costs and overall CoQ.
  • Used to justify quality investments and balance short-term spend against long-term savings and risk.

Example

A software project budgets for developer training, code reviews, and automated testing (prevention/appraisal). These actions reduce defect leakage, avoiding expensive rework, customer support, and warranty payouts after release (failure costs), lowering the total CoQ.

PMP Example Question

While planning quality, a project manager weighs added spending on training and inspections against the expected drop in warranty claims and rework. What concept is the PM applying?

  1. Cost of Quality (CoQ)
  2. Earned Value Management
  3. Opportunity Cost
  4. Value Engineering

Correct Answer: A — Cost of Quality (CoQ)

Explanation: CoQ considers prevention and appraisal costs versus the costs of failures across the product life, guiding investment to minimize total quality-related costs.

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