on Software Development Design

Transkript

1 Werner Mellis A Systematic on Software Development Design Folie 1 von 22

2 How to describe software development? dimensions of software development organizational division of labor coordination process formalization motivation and leadership... engineering requirements engineering quality assurance architectural methods... dimensions of software development process kind of horizontal division of labor kind of coordination important coordination mechanism interface to the customer quality assurance Folie 2 von 22

3 standard - explicit prescriptions - dimensions of software development process kind of horizontal division of labor kind of coordination important coordination mechanism interface to the customer quality assurance PSQM in advance planning, organizational programming batch, unidirectional, narrow band, formal... verification Folie 3 von 22

4 standard - implicit assumptions - dimensions of software development process kind of horizontal division of labor kind of coordination important coordination mechanism interface to the customer quality assurance PSQM incremental, sequential process oriented in advance planning, organizational programming batch, unidirectional, narrow band, formal... verification Folie 4 von 22

5 Are there alternatives? - not caused by ignorance and inability -?? dimensions PSQM process kind of horizontal division of labor increm ental, sequential process oriented ad hoc kind of coordination in advance mutual adjustment important coordination mechanism interface to the customer planning, organizational programming batch, unidirectional, narrow band quality assurance verification Folie 5 von 22

6 approach characteristics of the strategy environmental characteristics significance of effects effects of software development task characteristics situational conditions technology characteristics Folie 6 von 22

7 unclear task approach clear task adaptive model dimensions process kind of horizontal division of labor kind of coordination important coordination mechanism transformational model increm ental, sequential process oriented in advance planning, organizational programming interface to the customer batch, unidirectional, narrow band quality assurance verification Folie 7 von 22

8 Clear and Unclear Development Tasks Unclearness of Requirements Customer and technological requirements are unclear. Dynamic Nature of Requirements Customer and technological requirements change during development time. Technology Dynamics Knowledge about software technology and software proc-ess technology change during development time. Folie 8 von 22

9 Informations Flows and Interdependencies Development activities s 1- x Analyse 1 Analyse 2 Design 1 Design 2 Implem. 1 Implem. 2 Test 1 Test 2 Analyse x Design x Implem. x Test x Information flow in case of clear developpment task. Information flow in case of unclear development task. Folie 9 von 22

10 Process Design Project Start Concept Freeze Market Introduction Concept Development Implementation Concept Time Total Lead Time Response Time Project Start Concept Freeze Market Introduction Concept Development Implementation Concept Time Response Time Total Lead Time Folie 10 von 22

11 Design of Positions, Structure Development activities s 1- x Analyse 1 Analyse 2 Design 1 Design 2 Implem. 1 Implem. 2 Test 1 Test 2 Analyse x Design x Implem. x Test x Information flow in case of clear developpmentask. Information flow in case of uncleardevelopmentask. Folie 11 von 22

12 Quality Assurance Verification vs. validation prove correctness vs. help to understand the problem formal vs. informal Folie 12 von 22

13 Interface to the Customer Development process Development process Development process Development process Folie 13 von 22

14 Coordination coordination in advance by plan by program ad hoc coordination direct advice mutual adjustment Folie 14 von 22

15 unclear task clear task adaptive model parallel product oriented extensively ad hoc mutual adjustment dimensions process kind of horizontal division of labor kind of coordination important coordination mechanism transformational model increm ental, sequential process oriented extensively in advance planning, organizational programming frequent, bidirectional, broad band interface to the customer batch, unidirectional, narrow band validation, informal quality assurance verification, formal Folie 15 von 22

16 Transformational model system test architecture review review Interface test module test architecture module coding integration integration requirements modules interfaces function and behavior Internal structure of modules prescriptions for implementation Program code prescriptions for integration Folie 16 von 22

17 Adaptive model environment (application, competition, technology) architect / allocator Software module 1 module 2 team 1 team 2 Organization Folie 17 von 22

18 Thank you for listening! Folie 18 von 22