1. “Simulation Approach for Impact Analysis of Requirement Volatility Considering Dependency Change” Tiemen Roest

2. Paper Title Simulation Approach for Impact Analysis of Requirement Volatility Considering Dependency Change Authors Wang*, Li, Wang, Zhang, Wang Researchers at Chinese Academy of Sciences * Graduate at Chinese Academy of Sciences

3. Paper Purpose Proposing a solution (simulation approach) in the problem (risk) of Requirement Change during software projects Structure -Introduction of the problem -The DepRVSim* approach * DepRVSim = Requirements Volatility Simulation considering Dependency relationship - Case Study (scenario & evaluation) - Discussion - Related work - Conclusions & future work

4. Background (related literature) Risk of Requirement volatility Requirement is the “most significant risk factor” to a software project (Houston, Mackulak & Collofello, 2001) Costs of Requirement volatility “A requirements error found at the requirements stage costs only about one-fifth of what it would if found at the testing stage, and one-fiteenth of what it would cost after the system is in use” (Kotonya & Sommerville, 1996) Earlier described framework Simulation approach RVSim (Liu, Wang, Xiao, Li & Li, 2008). 2 Shortcomings of RVSim: - Dependency relationship not considered in detail - Changes in dependency relationship not modelled

5. Events: 3 routines - Addition -Modification -Deletion Event generator Influenced concepts (requiremens) 3 rules PDD

6. Process side

7. Deliverable side

8. Example - Software project at a mobile phone company - 20 requirements Requirement 14: Online login with mobile phone number and password - Customer change request Change the mobile phone number & password login method The dependency relationship between the requirements (Wang et al., 2012).

9. Adjusts complete Software Project Plan Modification Calculates new task effort for modification of R 14 Modifies dependency relationship of R 14 Calculates new task effort for modification of dependent requirements

10. Questions?