Cost of Quality • testingvn.com


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Cost of Quality

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Cost of Quality

Postby tvn » Wed 01 Apr, 2015 5:45 pm

DEFINITION

Cost of Quality (COQ) is a measure that quantifies the cost of control/conformance and the cost of failure of control/non-conformance. In other words, it sums up the costs related to prevention and detection of defects and the costs due to occurrences of defects.

Definition by ISTQB:
    cost of quality: The total costs incurred on quality activities and issues and often split into prevention costs, appraisal costs, internal failure costs and external failure costs.

EXPLANATION

    Cost of Control (Also known as Cost of Conformance)
      Prevention Cost
        The cost arises from efforts to prevent defects.
        Example: Quality Assurance costs
      Appraisal Cost
        The cost arises from efforts to detect defects.
        Example: Quality Control costs
    Cost of Failure of Control (Also known as Cost of Non-Conformance)
      Internal Failure Cost
        The cost arises from defects identified internally and efforts to correct them.
        Example: Cost of Rework (Fixing of internal defects and re-testing)
      External Failure Cost
        The cost arises from defects identified by the client or end-users and efforts to correct them.
        Example: Cost of Rework (Fixing of external defects and re-testing) and any other costs due to external defects (Product service/liability/recall, etc)

FORMULA / CALCULATION

    Cost of Quality (COQ) = Cost of Control + Cost of Failure of Control

where

    Cost of Control = Prevention Cost + Appraisal Cost

and

    Cost of Failure of Control = Internal Failure Cost + External Failure Cost

Nguon: http://softwaretestingfundamentals.com/cost-of-quality/
tvn
 
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