Managing Software Requirements: A Use Case Approach, Second Edition

Chapter 3. Requirements and the Software Lifecycle

Key Points

• The team's development process defines who is doing what, when, and how.

• In the waterfall model, software activities proceeded through a sequence of steps, and requirements were “fixed” early.

• In the spiral model, the first steps were taken to a more risk-driven and incremental approach to development.

• The iterative approach, a hybrid of the waterfall and spiral models, decouples the lifecycle phases from the software activities that take place in each phase.

• The iterative model is a more robust model and provides for successive refinement of the requirements over time.

Traditional Software Process Models

Effective requirements management can occur only within the context of a reasonably well-defined ...