System Development Life Cycle (SDLC)

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System Development Life Cycle (SDLC)

Bu yazıda Whitten/Bentley/Barlow’ın “System Analysis & Design Methods” adlı kitabından yararlanarak System Development Life Cycle (SDLC) hakkında kısa bilgiler vereceğiz. Kitabın özgün dilini (İngilizce) bozmadan, sistem geliştirmenin (diğer bir deyişle sistem analizinin) temel aşamalarını aşağıda sunuyoruz.

System analysis phase
1. Survey project scope and feasibility
2. Study current system
3. Define the end user’s requirement
4. Select a feasible solution (from candidate solutions)

System design phase
5. Design the new system
6. Acquire computer hardware and software

System implementation phase
7. Construct the new system
8. Deliver the new system

System support phase
9. Maintain and improve the system

Survey and study phase tasks

Learn how current system operates
Analyze problems, limitations and constraints
Brainstorm preliminary solutions
Update scope and feasibility
Present findings

Definition phase tasks

Define systems objectives and priorities
Outline requirements for new system
Define detailed requirements for new system

Selection phase tasks

Specify alternative solutions
Analyze feasibility of alternetive solutions
Prepare design and implementation schedule
Sell the system

Acquisition phase tasks

Research technical criteria and options
Solicit proposals/quotes from vendors
Validate vendor claims and performance
Evaluate and rank vendor proposals
Award contract and debrief losing vendor

Design phase tasks

Review program structures
Design top modules
Code and test top modules
Design lower modules
Code and test lower modules
Program test
System test

Physical design phase tasks

Design computer files and/or databases
Design computer outputs
Design computer inputs
Design terminal dialogues
Design methods and procedures
Design computer program specifications
Present and review the design

Construction phase tasks

Install hardware and software (site preparation, install and test)
Plan for programming
Build test data, test files, and databases
Write and test computer programs
Install applications software
Modify applications software

Delivery phase tasks

Install files and databases
Train end user to use the new system
Convert to the new system
Postimplementation review (immediate review-delayed review)

Yararlanılan kaynak: System Analysis & Design Methods, Whitten/Bentley/Barlow, Second Edition, Irwin, 1989