System Development Model

System Development Approaches

Bulbul Sharma Roll No.- 12 PGDM

Presentation Scheme  Meaning

of System Development Approach

 Models    

Waterfall Model Prototyping Model Iterative Enhancement Model Spiral Model

 Conclusion

What is System Development Model ?  “Specify

how the activities of development process are organized in the total system development effort.”

System Development Models Waterfall Model  Prototyping Model  Iterative Enhancement Model  Spiral Model 

Waterfall Model Problem Definition Feasibility Study Requirement Analysis System Design Coding & Testing Implementation System Maintenance

Advantages    

Easy to understand, easy to use Provides structure to inexperienced staff Sets requirements stability Good for management control (plan, staff, track)

Limitations   

All requirements must be known upfront System can be frozen before the design begins Little opportunity for customer to preview the system (until it may be too late)

Prototyping Start Requirement Analysis

Quick Design

Prototype Building

Engineer the Product

Refine Prototype

User Evaluation

Stop

Advantages 

   

Customers can “see” the system requirements as they are being gathered A more accurate end product Unexpected requirements accommodated Allows for flexible design and development Lower overall development costs when requirements change frequently

Limitations  Prototyping

can lead to false expectations.

 Prototyping

can lead to poorly designed systems.

Iterative Enhancement Model Design

Design

Design

Design

Implement

Implement

Implement Implement

Analysis

Analysis

Analysis

Analysis

Advantages  Easier

to test

 Provide

Feedback

Limitations  Provide

incomplete system

 Time

consuming

 High

cost

Spiral Model

Advantages  Risk

assessment

 Users

see the system early because of rapid prototyping tools

Limitations  Time

spent for evaluating risks too large for small or low-risk projects  The model is complex  Risk assessment expertise is required

Conclusion “NO Approach could be termed as the Best Approach.”