1. Systems Development Life Cycle

2. Definitions
System life cycle is an organizational process of developing and maintaining systems. It helps in establishing a system project plan, because it gives overall list of processes and sub-processes required developing a system. System development life cycle means combination of various activities. In the System Analysis and Design terminology, the system development life cycle means software development life cycle.

3. What is system development life cycle ?

5. Following are the different phases of software development cycle:
System study/Recognition of need
Feasibility study
System analysis
System design
Coding
Testing
Implementation
Maintenance

6. 1. System study
Preliminary Investigation
Request clarification
2. Feasibility study
Technical, Economic. Operational
Request approval
3. Determination of system requirements
Detailed evaluation of present system
Data Collection

7. 4. Design of system
Output/Input
Files
Procedures
Development of software
System Testing
5. Implementation, Post implementation
and maintenance
Evaluation
Maintenance
Enhanancement

8. Consideration Of Candidate System
There is more demand for computer services than there are resources available to meet the demand. The demand is made up of the following demands.
Advantages :
Operation of existing system.
Maintenance that focuses on programs.
Enhancement that involve major modifications in program structure.
Requests for candidate system.

9. Prototyping Prototyping :
Building a scaled-down working version of the system.
It is “Paralysis by Analysis” technique.
It advocates building a simple system through trial and error and refining it through an iterative.
Advantages :
Shorter development time, more accurate user requirement and greater user participation and support

10. Identify user requirements Analyze prototype I/P/O
System Development Lifecycle with Prototyping
Revise through iterative process
Identify user requirements
Analyze prototype I/P/O
Implement Prototype
Final Conversion
Post- Implementation
Maintenances

11. The basic Steps of prototyping are :
Identify the user’s information and operating requirements.
Develop a working prototype that focuses on only the most important function.
Allow the user to use the prototype, discuss requested changes and implement the most important changes.
Repeat the procedure of the prototype with further changes incorporated untill the system fully meets user requirements

12. End