Lecture Softwareengineering-Vertiefung

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1 Lecture Softwareengineering-Vertiefung 1 Introduction Summer term 2014 TU Chemnitz Department of Computer Science Dr. Dirk Müller

2 Overview Introduction Organizational issues Process of software inspection, process of software production Prototyping, configuration and version management Project management, methods of effort/cost estimation, software metrics Software quality, maintenance and software evolution Generic programming, templates, reflection in Java Design patterns (Singleton, Decorator, Adapter, Factory), adaptive and aspect-oriented programming 2/10

3 Organizational Issues Module: Softwareengineering-Vertiefung Time: Monday, 11:30 13:00 Place: room 1/205 3 or 5 credit points Test in written form, 60 min or 90 min, at the end of summer term 12 sessions: 7.4., 14.4., Easter Monday, 28.4., 5.5., 12.5., 19.5., 26.5., 2.6., 9.6. Whit Monday, 16.6., 23.6., 30.6., 7.7., /10

4 Text Books Ian Sommerville: Software Engineering 9, Addison-Wesley, 2010 [Som10] Helmut Balzert: Lehrbuch der Softwaretechnik. Softwaremanagement, 2. Auflage. Springer-Verlag, 2008, [Bal08] Helmut Balzert: Lehrbuch der Softwaretechnik. Basiskonzepte und Requirements Engineering, 3. Auflage. Springer-Verlag, 2009, [Bal09] Helmut Balzert: Lehrbuch der Softwaretechnik. Entwurf, Implementierung, Installation und Betrieb, 3. Auflage, Springer-Verlag, 2011 [Bal11] 4/10

5 Magic Triangle Good software shall be created quickly and at low costs. In most cases, focusing on two goals necessary since 1968 (NATO conference in Garmisch) engineer-like approach advertised because size and complexity with unstructured methods no more manageable Quality Time Costs 5/10

6 Definitions Goal: cost-effective development of SW of high quality David Parnas [1]: Design for Change multi-person construction of multi-version programs Helmut Balzert: Zielorientierte Bereitstellung und systematische Verwendung von Prinzipien, Methoden und Werkzeugen für die arbeitsteilige, ingenieurmäßige Entwicklung und Anwendung von umfangreichen Softwaresystemen. Zielorientiert bedeutet die Berücksichtigung z. B. von Kosten, Zeit, Qualität. [Bal09], S. 17 IEEE [2]: The application of a systematic, disciplined, quantifiable approach to the development, operation, and maintenance of software; that is, the application of engineering to software. 6/10

7 Quality of Software: ISO/IEC 9126 from 2001 Functionality Reliability Usability Suitability Accuracy Interoperability Security What? Maturity Fault tolerance Recoverability Understandability Learnability Operability In all groups: + compliance Software quality Resource utilization (e.g. memory, energy) Time behavior Analyzability Changeability Stability Testability Adaptability Installability Replaceability Efficiency Maintainability Portability Design for Change How? (non-functional properties) 7/10

8 Quality of Software: ISO/IEC 250mn from 2011 Software product Quality Requirements and Evaluation (SQuaRE) 2 new main criteria, now 8 in total Security Compatibility: Co-existence and Interoperability Functionality was renamed to Functional suitability Efficiency was renamed to Performance efficiency Maintainability with modularity and reusability Reliability with availability 8/10

9 Challenges Repeating error patterns, debugging after tests is late and expensive => Software inspection Customer wants to have visible results quickly: Prototyping Requirements are corrected and extended, great number of versions=> Version management Time and costs are well measurable, but quality? => Software metrics Operation is normally longest phase => Maintenance and software evolution Concrete methodologies Templates, reflection, design patterns, aspect-oriented programming 9/10

10 References [1] Parnas, David Lorge. Software engineering or methods for the multiperson construction of multi-version programs. Programming Methodology. Springer Berlin Heidelberg, [2] Abran, A. and J.W. Moore (exec. eds); P. Borque and R. Dupuis (eds.) SWEBOK: Guide to the Software Engineering Body of Knowledge. Piscataway, NJ, USA: IEEE 10/10

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