Requirement change management
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This document discusses requirements change management. It begins with an introduction stating that requirements often change before a system is deployed, and that changes should be formally documented and controlled. It then describes the requirements change management process, including recording change proposals, analyzing impacts, deciding on changes, and implementing approved changes. It also discusses the importance of requirements traceability. Finally, it concludes that systematic change management helps ensure useful and successful system development.
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Requirement change management
- 1. SoberIT Software Business and Engineering Institute Requirements Change Management
- 2. SoberIT Software Business and Engineering Institute Agenda • Introduction • Requirements Change Management Process • Traceability • Summary
- 3. SoberIT Software Business and Engineering Institute Introduction (1/3) requirements definition specification & design & coding & testing acceptance testing requirements management Requirements management is the process of managing changes to a system’s requirements [Kot98], and it is an important part of requirements engineering.
- 4. SoberIT Software Business and Engineering Institute Introduction (2/3) • It is often the case that more than 50% of a system’s requirements will be modified before it is put into service [Kot98]. • New requirements emerge and existing change due to • errors • increased understanding • change in external circumstances.
- 5. SoberIT Software Business and Engineering Institute Introduction (3/3) Changes to the requirements should be documented and controlled formally. Change management process ensures that • changes are made systematically •similar information is collected for each proposed change •overall analysis is made about the costs, benefits and timing • the requirements document is updated.
- 6. SoberIT Software Business and Engineering Institute Requirements Change Management Process (1/5) requirements change management process • updated user requirements document • change history recording analysing deciding implementing • approved user requirements document • change proposal
- 7. SoberIT Software Business and Engineering Institute Requirements Change Management Process (2/5) Recording a change proposal: • Stakeholders submit proposals for requirements changes using a pre-defined form.
- 8. SoberIT Software Business and Engineering Institute Requirements Change Management Process (3/5) Analysing a change request: • The proposed change is analysed to see • if it is valid. Sometimes stakeholders misunderstand the requirements and suggest unnecessary changes. • how many requirements and system components are affected • how much it would cost, in both time and money, to make the change • what the benefits of the change are.
- 9. SoberIT Software Business and Engineering Institute Requirements Change Management Process (4/5) Deciding on a change request: • Change requests are considered formally by a group or a person who decide whether or not the change should be accepted.
- 10. SoberIT Software Business and Engineering Institute Requirements Change Management Process (5/5) Implementing a change: • Updating the requirements document. • Informing all the necessary people.
- 11. SoberIT Software Business and Engineering Institute Traceability • Requirements cannot be managed effectively without requirements traceability [Kot98]. • Traceability types [Som97] • requirements - sources • requirements - rationale • requirements - requirements • requirements - architecture • requirements - test cases
- 12. SoberIT Software Business and Engineering Institute Summary (1/2) User requirements definition User requirements management Design, coding and system testing Acceptance testing Requirements Engineering Useful and Successful Products
- 13. SoberIT Software Business and Engineering Institute Summary (2/2) Systematic requirements change management ensures that product development produces useful and succesful systems.
- 14. SoberIT Software Business and Engineering Institute References • [Kot98] G. Kotonya and I. Sommerville, Requirements Engineering - Processes and Techniques, John Wiley & Sons, New York, 1998. • [Som97] I. Sommerville and P. Sawyer, Requirements Engineering - A Good Practice Guide, John Wiley & Sons, New York, 1997.