1. 1 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 Supplementary Slides for Software Engineering: A Practitioner's Approach, 5/e Supplementary Slides for Software Engineering: A Practitioner's Approach, 5/e copyright © 1996, 2001 R.S. Pressman & Associates, Inc. For University Use Only May be reproduced ONLY for student use at the university level when used in conjunction with Software Engineering: A Practitioner's Approach. Any other reproduction or use is expressly prohibited. This presentation, slides, or hardcopy may NOT be used for short courses, industry seminars, or consulting purposes.

2. 2 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 Chapter 5 Software Project Planning

3. 3 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 Software Project Planning The overall goal of project planning is to establish a pragmatic strategy for controlling, tracking, and monitoring a complex technical project. Why? So the end result gets done on time, with quality!

4. 4 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 The Steps  Scoping—understand the problem and the work that must be done  Estimation—how much effort? how much time?  Risk—what can go wrong? how can we avoid it? what can we do about it?  Schedule—how do we allocate resources along the timeline? what are the milestones?  Control strategy—how do we control quality? how do we control change?

5. 5 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 Write it Down! SoftwareProjectPlan Project Scope EstimatesRisksSchedule Control strategy

6. 6 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 To Understand Scope...  Understand the customers needs  understand the business context  understand the project boundaries  understand the customer’s motivation  understand the likely paths for change  understand that... Even when you understand, nothing is guaranteed!

7. 7 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 Resources Hardware / software tools Reusable software components People

8. 8 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 Cost Estimation project scope must be explicitly defined task and/or functional decomposition is necessary historical measures (metrics) are very helpful at least two different techniques should be used remember that uncertainty is inherent

9. 9 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 Estimation Techniques  past (similar) project experience  conventional estimation techniques  task breakdown and effort estimates  size (e.g., FP) estimates  tools (e.g., Checkpoint)

10. 10 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 Software Sizing  “Fuzzy logic” – uses the approximate reasoning techniques.  Function point – as discussed in Chapter 4  Standard component – Software is composed of a number of different standard components such as subsystems, modules, screens, reports,...  Change – the project encompasses the use of existing software, so we estimate the number and type of modifications.

11. 11 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 Conventional Methods: LOC/FP Approach  compute LOC/FP using estimates of information domain values  use baseline metrics collected from past projects

12. 12 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 Example: LOC Approach

13. 13 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 Example: FP Approach

14. 14 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 Empirical Estimation Models General form: effort = tuning coefficient * size exponent usually derived as person-months of effort required either a constant or a number derived based on complexity of project usually LOC but may also be function point empirically derived

15. 15 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 Estimation Guidelines estimate using at least two techniques get estimates from independent sources avoid over-optimism, assume difficulties you've arrived at an estimate, sleep on it adjust for the people who'll be doing the job—they have the highest impact

16. 16 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 The Software Equation 0.333 3 4 E = [LOC * B / p] * (1/t ) E = effort in person-month or person-years t = project duration in month or years B = “special skills factor” P = “productivity parameter”

17. 17 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 The Make-Buy Decision Decision tree

18. 18 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 Computing Expected Cost (path probability) x (estimated path cost) (path probability) x (estimated path cost) i i For example, the expected cost to build is: expected cost = 0.30($380K)+0.70($450K) similarly, expected cost = $382K expected cost = $267K expected cost = $410K build reuse buy contr expected cost = = $429 K

19. 19 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 Outsourcing Strategic : business managers consider whether a significant portion of software work can be contracted to others Tactical : project manager determines whether part or all of a project can be best accomplished by subcontracting the software work

20. 20 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 Automated Estimation Tools All performs these six generic functions:  Sizing of project deliverables  Selecting project activities  Predicating staffing levels  Predicating software effort  Predicating software cost  Predicating software schedules