IMPROVE SOFTWARE QUALITY BY REUSING KNOWLEDGE AND EXPERIENCE

Transcription

1 Empirical i lmodel lbuilding and Methods Prof. Dr. Dr. h.c. Dieter Rombach SS 2011 IMPROVE SOFTWARE QUALITY BY REUSING KNOWLEDGE AND EXPERIENCE SandraArango / Olesia Oliinyk 1

2 AGENDA Software Quality Improvement (Problems and Differences) A Mature Software Organization Traditional and Expanded Focus of Software Development QualityImprovement Paradigm (QIP) NASA example Conclusions 2

3 SOFTWARE QUALITY IMPROVEMENT/PROBLEMS AND DIFFERENCES Quality improvement process for so ware development Quality improvement process for manufacturing industry In Manufacturing quality models are based on collection of data from repeated function Software is developed ones > quality can not be controlled by repetition. In SE quality of product can be detected only after implementation, but it is expensive to correct. So Quality improvement in SE should ldfocus on earlier stages. Approaches from manufacturing can not deal with software nature. They assume a picture of good software. 3

4 A MATURE SOFTWARE ORGANIZATION Applies recent management strategies to: Understand dthe software process and product Define business needs Evaluate aspects of the process Collect and use information for project control feedback from projects to the company to help in the quality improvement program. Build competencies of the business by packaging and reusing experience. 4

5 TRADITIONAL AND EXPANDED FOCUS OF SOFTWARE DEVELOPMENT Traditional Focus Delivering specific products and services Decomposing a complex problem into simpler ones Designing and implementing Expanded Focus Developing capabilities Unifying different solutions into more general ones g g p g Analyzing and synthesizing Detailing Validating and verifying Abstracting from detail Experimenting 5

6 QUALITY IMPROVEMENT PARADIGM (QIP) 6

7 QUALITY IMPROVEMENT PARADIGM (QIP) QIP is an iterative framework Based on: development of strategic capabilities Goal Oriented Measurement (GQM) approach Experience Factory 7

8 QIP & DEVELOPMENT OF STRATEGIC CAPABILITIES development of strategic capabilities Experience reuse and organizational sharing Acquisition of core competencies that support strategic capabilities 8

9 Goal Oriented Measurement (GQM) Goal: Propose Issue Object Viewpoint Context Questions Metrics QIP & GQM to identify and control business processes in a measurable way define corporate goals setting and evaluation enhances the evaluation of projects 9

10 QIP & THE EXPERIENCE FACTORY Experience Factory Infrastructure to transform and package artifacts and experiences provided by projects asreusable units: experience packages Supports other projects providing those reusable units. 10

11 SYNERGIES BETWEEN PROJECT ORGANIZATION AND EXPERIENCE FACTORY 11

12 NASA EXAMPLE Software Engineering Laboratory at NASA has a goal to understand and improve Software development processes and products in Flight Dynamics Division Characterize It defined the development processes and built models to improve the process s s manageability Set Goal Develop core competences for object oriented design and Ada. Choose process A system > FORTRAN, standard dmethodology Bsystem > ADA, object oriented Execution Implement A and B Analyze Quality of B improvement over A (error density) Package Experience report on lessons learned Recommendations to the methodology 12

13 CONCLUSIONS The approach presented in the article is based on QIP, GQM and Experience Factory. Using this approach an organization can improve quality focusing on itsstrategict t i capabilities. Example shows that these ideas are feasible and have been successfully applied in a production environment to create a continuously improving organization. 13

14 QUESTIONS???