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Thursday, September 06, 2007

Common Software System Development Methodologies

There are 4 common software system development methodologies. These methodologies comprise of:

(1) A process - to define activities or tasks to achieve the goal of the methodology
(2) A vocabulary - to describe the process and work products created during the process application.
(3) Rules and guidelines - to define the quality of the process and the work products

The four methodologies are shown in the table below along with their strengths and weaknesses.

Domain

RUP

Shlaer-Mellar

CRC

XP

Emphasis

- Incremental and iteration

- Execution for verification

Scenarios and simplicity

Simplicity, design through integration and refactoring

Strengths

- Comprehensive

- Well Defined artifacts and roles

- Incremental deliveries

- Simulation capability

- Well defined testing rules

- Well defined transition from one step in the process to another

- Real-time system support

- Simplicity

- Easy to use to transition from procedural to object oriented concepts

- Focuses on object value, leading to optimized system

- Focuses and cares about the programming environment

- Supports and requires close relationship between clients and developers

- Accounts for changes in the development process

Weakness

- Large and difficult

- Complicated rules

- Customization is not straight-forward

- Limited vendors supporting the process

- Considerable learning curve

- Focuses too much on state modeling.

- Limited vendors supporting the process

- Supports primarily classes

- Requires a facilitator

- Relies on an ideal development environment

- Depends extensively on client commitments

- Requires high quality human interaction among development team

- The system is in a constant state of maintenance

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