CMMI for High-Performance with TSP/PSP

Transcription

1 Dr. Kıvanç DİNÇER, PMP Hace6epe University CMMI for High-Performance with TSP/PSP

2 Systems & SoFware The Systems usage has experienced an growth over the past years. IT Systems are much more sofware dependent than before.

3 Cost and Schedule Performance Trends - 2

4 Cost and Schedule Performance Trends

5 So6ware Process Quality SoFware is the only modern technology that ignores quality test. Most sofware defects are found in or afer test when defect removal is the most expensive and least This strategy results in buggy products and unnecessary rework, development costs.

6 Cost to Fix Defects Source: Construx SoFware Builders, Inc.

7 CMMI with TSP and PSP

8 CAPABILITY MATURITY MODEL INTEGRATED (CMM / CMMI)

9 CMM as a Remedy In the late 1980s and early 1990s the SEI developed the Capability Maturity Model (CMM) which captured organiza@onal best prac@ces for sofware development.

10 What is CMMI? The Purpose of CMM is to provide guidance for improving your s processes and your ability to manage the development, and maintenance of products and services

11 CMMI In a Nutshell

12 CMMI Staged - 5 Maturity Levels Level 4 Quan@ta@vely Managed Level 5 Op@mizing Process performance con@nually improved through incremental and innova@ve technological improvements. Processes are controlled using sta@s@cal and other quan@ta@ve techniques. Level 1 Level 3 Defined Level 2 Managed Processes are well characterized and understood. Processes, standards, procedures, tools, etc. are defined at the organiza@onal (Organiza@on X ) level. Proac@ve. Processes are planned, documented, performed, monitored, and controlled at the project level. O6en reac@ve. Ini@al Processes are unpredictable, poorly controlled, reac@ve.

13 CMMI Terminology and Structure Maturity Levels (1-5) Process Area 1 Process Area 2 Process Area n Required. Specific for each process area. Specific Goals Commitment to Perform Generic Goals Common Features Ability to Perform Direc@ng Implementa@on Required. Common across all process areas. Verifying Implementa@on Specific Prac@ces Required Required Generic Prac@ces Sub prac@ces, typical work products, discipline amplifica@ons, generic prac@ce elabora@ons, goal and goal and prac@ce notes, and references Sub prac@ces, typical work products, discipline amplifica@ons, generic prac@ce elabora@ons, goal and goal and prac@ce notes, and references

14 Examples For the Requirements Management Process Area: An example Goal (required): Manage Requirements An example to support the Goal (required): Maintain bi- traceability of requirements Examples (suggested, but not required) of typical Work Products might be Requirements traceability matrix or Requirements tracking system

15 CMMI TR den Örnekler

16 Maturity Levels and Performance Many people believe that when you achieve a higher CMMI maturity ra@ng that higher performance follows. Achieving a higher CMMI maturity ra@ng doesn t guarantee higher performance The performance you achieve will depend on your implementa@on of CMMI.

17 CMM / CMMI CMMI is a model not a process. It describes characteris,cs of effec@ve processes, not the processes themselves. The trick is to translate the model into a high- performance, high- maturity implementa@on. Also, to do this effec$vely and efficiently.

18 CMMI Challenges - 1 There can be considerable performance varia@on in implementa@ons of CMMI prac@ces. Why? The example prac@ces don t all have equivalent performance, e.g. informal reviews aren t as effec@ve as formal inspec@ons. The same example prac@ce can have substan@al varia@on in performance, e.g. average inspec@on yield* can range from 30% to 70%. Complete, detailed, performance metrics for the process are lacking and what isn t measured isn t managed. Remember that sa@sfying a prac@ce is no guarantee of performance. *Yield is the percentage of defects found during the inspec@on

19 CMMI Challenges - 2 CMMI is a model of organiza@onal capability and so implementa@ons tend to be focused at the organiza@on level. There is increasingly less focus on the processes of projects and teams individual managers and developers What does organiza@onal performance depend on? It is a func@on of the process performance of the projects and teams which is a func@on of the process performance of the managers and developers.

20 CMMI Challenges - 3 Process ins@tu@onaliza@on is a key implementa@on challenge. coverage the percentage of the organiza@on that is using the process. process fidelity the degree to which the process is prac@ced and measured as defined.

21 (cont d) Impact on Performance Example of impact on performance using Assume: Only code are conducted (process design flaw) Only half the modules are inspected (process fidelity issue) Only half of the projects are using the process (problem with coverage) yield is only 30% (poor Only about 75% of the defects will be found before system test instead of the 95% that would be found if were fully implemented. Cost to the more defects to find and fix in system test.

22 CMMI: Time to Move Up

23 CMMI with TSP and PSP

24 PERSONAL SOFTWARE PROCESS (PSP)

25 Birth of PSP SEI Fellow Wa6s Humphrey decided to apply the underlying principles of the CMM to the sofware development of a single developer. The result of this effort was the Personal SoFware Process (PSP). It is designed to be a CMM level 5 process for individual sofware developers.

26 What is a Process? A process is a defined set of steps for doing a job. A process guides your work. A process is usually defined for a job that is done A process provides a founda@on for planning. A process is a template, a generic set of steps. A plan is a set of steps for a specific job, plus other things such as effort, costs, and dates.

27 Personal So6ware Process The PSP is a process designed for individual use that applies to structured personal tasks. With PSP, developers use defined and measured personal processes. They gather and defect data as they work. They used the data to plan and track their work, Manage the quality of the products they produce Measurably improve performance

28 PSP Steps

29 Process Planning Framework

30 PSP Changes So6ware SoFware work is planned. Plans are based on processes and are based on historical process data. SoFware work is measured and tracked. Status is based on the data. SoFware quality is also planned, tracked, and managed.

31 Why Define and Use a Personal Process? Benefits include Consistency Efficiency Basis for improvement

32 1/3 Consistency Using a defined personal process helps you to achieve consistent results. Your results are more likely to be similar that you use the process. Your work becomes more predictable.

33 2/3 Efficiency Using a defined personal process helps you to be more efficient. It structures and guides your work. Orders the steps Avoids rework It keeps you focused on what needs to be done. Fewer restarts Manage interrupts You can accomplish your work in

34 3/3 Efficiency By gathering data on your work, you can determine which steps Take the Cause you the most trouble Are the least With this you can for improving your results by making changes to your process.

35 PSP Improves Performance accuracy Fewer More accurate balanced around zero Quality Yield imroves by 2x to 3x Fewer defects in unit test, test, and system test COQ is flat or reduced Effort Accuracy

36 PSP Reduces Defects Effort Accuracy

37 PSP Improves

38 TEAM SOFTWARE PROCESS (TSP)

39 CMMI with TSP and PSP

40 Birth of TSP It soon became obvious that, while excellent results were possible using the PSP, it was almost impossible to maintain the discipline required for PSP if the surrounding environment did not encourage and demand them. Humphrey then developed the Team SoFware Process (TSP) for the smallest unit in most the project team. TSP was designed to be a CMM level 5 process for project teams.

41 Working in Teams Successful teams are both and rare. Although many teams come close to their product and business goals, they ofen do so at the expense of the team members. A jelled team works together smoothly and efficiently. A jelled team is greater than the sum of its parts and the enjoyment people derive from the work is greater than you would expect. Peopleware, DeMarco & Lister. TSP is a proven- effec@ve way of building jelled teams quickly.

42 Team So6ware Process The Team SoFware Process (TSP) is a sofware development process for engineering teams. TSP is a process- based solu@on to common sofware engineering and management issues cost and schedule predictability produc@vity and product quality process improvement

43 TSP Teams are Self- Directed

44 the How- to Technologies Used as of CMMI or to augment to improve performance and achieve higher maturity. Introduces self- direct team management style required for high performance teams.

45 Building High- Performance Teams TSP builds high- performance teams from the bo6om- up.

46 TSP Process Elements

47 TSP Coverage of CMMI By Maturity Level

48 TSP Improves Effort (Cost) and Schedule Predictability

49 TSP Improves Product and Process Quality An analysis of 20 projects in 13 showed TSP teams averaged 0.06 defects per thousand lines of new or modified code. Approximately 1/3 of these projects were defect- free. These results are be6er than those achieved in high maturity Source: CMU/SEI TR- 014

50 TSP System Test Performance Range and Average

51 TSP Accelerates CMMI Improvement

52 NAVAIR AV- 8B TSP/CMMI Experience AV- 8B is a NAVAIR System Support Ac@vity. They integrate new features into the Marine Harrier aircraf. They used TSP to reduce to go from CMM Level 1 to CMM Level 4. Similar results can be achieved with CMMI.

53 TSP is a prac@cal, accessible method for achieving the benefits of high maturity process on a much accelerated schedule. Several organiza@ons have used the TSP to move up the maturity ladder in much than reported averages, including one NAVAIR group that went from level 2 to level 4 in just 16 months largely on the strength of its TSP implementa@on.

54 The results demonstrate that a high- performance CMMI implementa@on is possible with the use of PSP & TSP. high performance maturity Predictable and improved cost and schedule Near defect- free quality Sa@sfied developers, managers and customers

55 The results demonstrate that a more successful CMMI implementa@ons are possible with the use of PSP & TSP. high performance maturity Predictable and improved cost and schedule Near defect- free quality Sa@sfied developers, managers and customers SUMMARY

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