Spiral Model

2. Introduction Malik Khurram BS (telecom) Section 4th (B) Topic spiral model Software Engineering-I

4. This model was not the first model to discuss iterative development, but it was the first model to explain why the iteration matters.Software Engineering-I

6. System Development lifecycle (SDLC)

7. Combines features of prototyping and waterfall model Software Engineering-I

9. For medium to high-risk projects

10. Users are unsure of their needs

11. Requirements are complex

12. New product line

13. Significant changes are expected Software Engineering-I

14. Four Fold Procedure Evaluating the first prototype in terms of its strengths, weaknesses, and risks. Defining the requirements of the second prototype Planning and designing the second prototype Constructing and testing the second prototype Software Engineering-I

15. Phase in spiral model There are four phases in the “SPIRAL MODEL” which are: Plan Risk analysis Engineering Customer evaluation Software Engineering-I

18. This phase identify and resolve all the possible risks in the project developmentSoftware Engineering-I

20. The output of this phase is passed through all the phases iteratively in order to obtain improvements in the same. Software Engineering-I

24. For smaller projects, the concept of agile software development is becoming a viable alternativeSoftware Engineering-I

26. Critical high-risk functions are developed first

27. The design does not have to be perfect

28. Users can be closely tied to all lifecycle steps

30. Critical high-risk functions are developed first

31. The design does not have to be perfect

32. Users can be closely tied to all lifecycle steps

33. Early and frequent feedback from usersSoftware Engineering-I

35. The model is complex

36. Risk assessment expertise is required Software Engineering-I

38. http://wikipedia.org/wiki/Spiral_model

39. http://scitec.uwichill.edu/spiralmodel.htm

40. http://images.google.com.pk