Process Patterns in Software Development Methodologies, Slides of Software Development Methodologies

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Software Development Methodologies Lecturer:

Raman Ramsin

Lecture 18 Process Patterns

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Software Development Methodologies – Lecture 18 Process PatternsProcess

Patterns

„^ Results of applying abstraction to recurring processes andprocess components „^ Create means for developing methodologies throughCreate

means for developing methodologies through composition of appropriate pattern instances „ Reflect the state of the practice and are based on well-established, refined concepts

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Sharif University of Technology

Software Development Methodologies – Lecture 18 Process Patterns: AmblerProcess

Patterns: Ambler

„^ Ambler is the author of the only books so far written on object-oriented process patterns. „^ Defines a process pattern as “a pattern which describes aproven

successful approach and/or series of actions for proven, successful approach and/or series of actions fordeveloping software” „ Defines an object-oriented process pattern as “a collection ofgeneral techniques, actions, and/or tasks (activities) ford^

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developing object-oriented software”.

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Software Development Methodologies – Lecture 18 Ambler

's Process Patterns: Types

Ambler s Process Patterns: Types^ „^ In the ascending order of abstraction level:„^ In

the ascending order of abstraction level:1.^ Task Process Pattern: depicting the detailed steps to execute a specific

task of

the process.2. Stage Process Pattern: depicting the steps that need to be done in order toperform a

stage of the process. A

stage process pattern is usually made up of

several

task process patterns.

3.^ Phase Process Pattern: depicting the interaction of two or more

stage process

patterns in order to execute the

phase to which they belong.

„^ In any process,

phases are performed in serial order, whereas the

stage

patterns inside them can be executed iteratively. „ Ambler proposes many patterns of each type, complete with detailedsteps and guidelines for integrating and shaping the patterns into acomprehensive process.

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co^ p e e s

e p ocess

Software Development Methodologies – Lecture 18 Ambler

's Process Patterns: Stage – Example

Ambler s Process Patterns: Stage

Example

Program Department of Computer Engineering

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Sharif University of Technology

[Ambler 1998]

Software Development Methodologies – Lecture 18 Ambler

's Process Patterns: Phase – Example

Ambler s Process Patterns: Phase

Example

Construct Department of Computer Engineering

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Sharif University of Technology

[Ambler 1998]

Software Development Methodologies – Lecture 18 Ambler's Process Patterns: Strengths and Weaknesses „^ Strengths^

Comprehensive and detailed specification document Full coverage of generic development lifecycle activities Iterative-incremental process

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equirements-based development

^ Based on functional, behavioural, and structural modeling

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of the problem domain and the system.

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Software Development Methodologies – Lecture 18 Ambler's Process Patterns: Strengths and Weaknesses „^ Strengths (Contd.)^

Accommodates comprehensive modeling at all levels(enterprise to problem domain to system objects; logicalto physical). Rich modeling-language support (UML), especially instructural and behavioural modeling features Support for formalism (through UML/OCL) Traceability supported through use cases

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Software Development Methodologies – Lecture 18 Ambler's Process Patterns: Strengths and Weaknesses „^ Weaknesses (Contd.)^

Configurability not addressed Seamlessness damaged due to hitches in model mapping Seamlessness damaged due to hitches in model mapping Prohibitive number of models Substantial potential for inconsistency of models

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Software Development Methodologies – Lecture 18 References „^ Coplien, J. O., A development process generative pattern language. InProceedings of the First Annual Conference on Pattern Languages of

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Programming (PLoP), 1994. „ Ambler, S. W.,

Process Patterns: Building Large-Scale Systems Using

Object Technology. Cambridge University Press, 1998. „ Ambler, S. W.,

More Process Patterns: Delivering Large-Scale Systems

Using Object Technology. Cambridge University Press, 1999.

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