1. Software Quality assurance SQA – SWE 333
Software Quality Costs
Hussein Alhashimi

2. Costs of software quality
Objectives of cost of software quality metrics

3. Cost of Quality (COQ)
It’s a term that's widely used – and widely misunderstood.
The "cost of quality" isn't the price of creating a quality product or service. It's the cost of NOT creating a quality product or service.
Every time work is redone, the cost of quality increases. Obvious examples include:
The reworking of a manufactured item.
The retesting of an assembly.
The rebuilding of a tool.

4. Cost of Quality (COQ) -2 The correction of a bank statement.
The reworking of a service, such as the reprocessing of a loan operation or the replacement of a food order in a restaurant

5. Types of Quality Costs Prevention Costs:
The costs of all activities specifically designed to prevent poor quality in products or services.
Examples are the costs of:
New product review
Quality planning
Supplier capability surveys
Process capability evaluations
Quality improvement team meetings
Quality improvement projects
Quality education and training

6. Types of Quality Costs Appraisal Costs:
The costs associated with measuring, evaluating or auditing products or services to assure conformance to quality standards and performance requirements.
These include the costs of:
Incoming and source inspection/test of purchased material
In-process and final inspection/test
Product, process or service audits
Calibration of measuring and test equipment
Associated supplies and materials

7. Types of Quality Costs Failure Costs
The costs resulting from products or services not conforming to requirements or customer/user needs. Failure costs are divided into internal and external failure categories.
Internal Failure Costs:
Failure costs occurring prior to delivery or shipment of the product, or the furnishing of a service, to the customer.
Examples are the costs of:
Scrap
Rework
Re-inspection
Re-testing
Material review
Downgrading

8. Types of Quality Costs External Failure Costs:
Failure costs occurring after delivery or shipment of the product — and during or after furnishing of a service — to the customer.
Examples are the costs of:
Processing customer complaints
Customer returns
Warranty claims
Product recalls
Total Quality Costs:
The sum of the above costs. 

9. Identify software quality Cost
Project quality plan
Number of errors per 1000 line of code (KLOC)
Over time hours to finish software inspection
Configuration management tool purchase
Detailed design walkthrough
Re-programming of defects of a program before shipment
Room temperature
Payment of external consultant to participate in unit testing
Payment of external consultant to prepare software quality assurance procedures and checklists
Purchase of software unit to integrate with our application
Training of programmers in a course " Java advanced programming"
Correction of software defects for installed software after customer complaints
Construction of new company building

10. Importance of software quality cost model
To help the project management team in distributing the cost to the four parts and to check the outcomes.
Based on theses outcomes the budget is adjusted and redistributed i.e. a kind of decision making for management.

11. Identify software quality Cost
Project quality plan
NIL
Number of errors per 1000 line of code (KLOC)
Over time hours to finish software inspection
Appraisal Cost
Configuration management tool purchase
Prevention Cost
Detailed design walkthrough

12. Identify software quality Cost-2
Re-programming of defects of a program before shipment
Internal failure Cost
Room temperature
NIL
Payment of external consultant to participate in unit testing
Appraisal Cost
Payment of external consultant to prepare software quality assurance procedures and checklists
Prevention Cost

13. Identify software quality Cost-3
Purchase of software unit to integrate with our application
NIL
Training of programmers in a course " Java advanced programming“
Prevention Cost
Correction of software defects for installed software after customer complaints
External Failure Cost
Construction of new company building

14. Identify software quality Cost-4
Purchase of software unit to integrate with our application
NIL
Training of programmers in a course " Java advanced programming“
Prevention Cost
Correction of software defects for installed software after customer complaints
External Failure Cost
Construction of new company building