Software Estimation: Components of Software Estimations, Estimation methods, Problems associated with estimation, Key project factors that influence estimation. Size Estimation: Two views of sizing,

software requirements size estimation

1. UNTI 4 1.Software Estimation 2.Size Estimation:

2. UNIT 4 Software Estimation: Components of Software Estimations, Estimation methods, Problems associated with estimation, Key project factors that influence estimation. Size Estimation: Two views of sizing, Function Point Analysis, Mark II FPA, Full Function Points, LOC Estimation

3. Components of Software Estimations

4. Components of Software Estimations SIZE EFFORT SCHEDULE COST

5. Estimation methods Characteristics :

6. Estimation methods

7. Estimation methods

8. Problems associated with estimation Estimation without integrity No time to estimate Incomplete or incorrect requirements No past data available Invalid estimation assumption 1–productivity is independent of the size of the software Invalid estimation assumption 2: productivity is independent of imposed schedule Other important project factors not considered

9. Problems associated with estimation

10. Problems associated with estimation

11. Key project factors that influence estimation 1 . availability and stability of development environment. 2. team capability and experience 3.team stability 4.maturity of the processes 5.accounting for reusable software available 6.estimating for reusable software to be built . 7.extent of communication possible with the users or customers . 8.extent of automated tools used for software development and maintenance 9.cohesion of stakeholders and teams. 10.lack of training and skills in estimating. 11.poor tracking of estimates during the project exaction. 12.concept of tolerance not used .

12. Size Estimation: Requirements of a project 1. functional requirements 2.non functional requirements , speed, user friendliness, volume, etc. 3.constraints under which the system is to operate. 4. the interfaces the system should have with other systems.

13. Two views of sizing Users view Developers view Users functional perspective Developers technical perspective

14. Two views of sizing

15. Two views of sizing

16. Function point anaalysis

17. Function point anaalysis

18. Counting development function points

19. Counting development function points

20. Counting development function points

21. Counting development function points

22. Counting development function points