Software of cost 4
0 likes906 views
The document discusses the costs of software quality, which can be categorized as: 1) Costs of control including prevention costs (quality infrastructure investments) and appraisal costs (error detection activities for specific projects). 2) Internal failure costs for correcting errors found before customer use. 3) External failure costs for correcting failures found after customer use. It provides examples for each category such as design reviews, testing, and resolving customer complaints. The document also mentions managerial preparation/control costs and costs of managerial failures.
Software of cost 4
- 1. Cost of Software Quality Luthfiya Ulinnuha - 5209100115
- 2. Cost of Software Cost of failure of Cost of Control control Internal failure Prevention Cost Cost External failure Appraisal Cost cost
- 3. What is? • Cost of software is the economic assesment of software quality dvelopment and maintenance -is just another class of software quality metric, where financial values are used as the measuring tools.
- 4. Why must be? Control organization-initiated costs regarding software error Evaluation of the economic damages of software failures Evaluation of plans to increase or decrease SQA
- 5. Cost of Control • Costs of control include costs that are spent to prevent and detect software errors in order to reduce them to an accepted level. Prevention Cost • Prevention costs include investments in quality infrastructure and quality activities that are not directed to a specific project or system, being general to the organization. Appraisal Cost • Appraisal costs include the costs of activities performed for a specific project or software system for the purpose of detecting software errors.
- 6. Prevention Cost • Investment in a new development 1. Procedures and work instructions 2. Support devices: templates, checklists, etc. 3. Software configuration management system 4. Software quality metrics. • Reqular implementation SQA 1. Instruction of new employees 2. Instruction of employees in new and updated SQA. 3. Certification of employees 4. Consultations on SQA Control of SQA 1. Internal quality reviews 2. External quality audits by customers 3. Management quality reviews.
- 7. Appraisal Cost • Appraisal costs are devoted to detection of software errors in specific projects or software systems. Reviews • Formal design reviews (DRs) • Peer reviews (inspections and walkthroughs) • Expert reviews. Cost of software Testing • Unit tests • Integration tests • Software system tests • Acceptance tests Cost of quality of external participants
- 8. Internal Failure Cost • Internal failure costs are those incurred when correcting errors that have been detected by - design reviews - software tests - and acceptance tests performed before the software has been installed at customer sites.
- 9. Internal Failure Cost Type(cont’d) Cost of redesign Cost of re-progamming Cost of repeated design review
- 10. External Failure Cost • External failure costs entail the costs of correcting failures detected by customers or maintenance teams after the software system has been installed at customer sites.
- 11. External Failure Cost Type (con’td) Type : Rsolution of customer complaints Correction of software bugs detected during regular operation
- 12. Another Extended Cost Managerial Costs of carrying out contract Preparation reviews and control cost Costs of preparing project plans Costs of periodic updating of associated project and quality plans. with activities Costs of performing regular per- progress control (internal) formed to prevent Costs of performing regular managerial progress control (external) failures or reduce prospects of their occurrence.
- 13. Another Extended Cost (cont’d) Managerial Unplanned cost Failure cost Damaged Paid for unrealistic schedule proposal Damaged Paid for management’s failure to recruits Domino effect