Systems analysis and development CIS210 ch 13

CIS 210
Systems Analysis
and Development
Week 8 Part I
Finalizing Design Specifications


Objectives
• Upon completion of part I you will be able to:
– Understand and be able to explain the concepts
related to system design specifications
– Understand and be able to explain the concepts
related to structured charts
– Understand and be able to explain the concepts
related to evolutionary and throwaway prototyping
– Understand and be able to explain the concepts
related to the role of CASE tools in capturing design
specifications


Overview
• Today’s Emphasis on Speed
– Blurring the lines
• Analysis and design
• Design and implementation

• Traditional Design Specification
– Clear lines
– Completed by analysts

• Agile Methodologies

– Focus on software
– Rapid iterative movement between design and coding


Finalizing Design
Specifications
• Overview
– Result of the SDLC
– Software requirements specifications

• The Final Design Specification Process
– Blueprint for physical system

• Deliverables and Outcomes
– Set of physical design specifications


Traditional Methods
• Overview
– Pre-CASE
– Natural language documents

• Specification Documents
– Computer-based requirements documents

• Structure Charts
–
–
–
–

–

Show breakdown of the system
Modules
Data couple
Flag
Pseudocode


Traditional Methods
for Representing Specifications
• Prototyping
– Overview
• Construction of model system
• Allows testing by users and developers

– Evolutionary prototyping
• Prototype becomes actual system

– Throwaway prototyping
• Does not preserve prototype
• Quick development


Traditional Methods
for Representing Specifications
• Rapid Application Development (RAD)
–
–
–

–
–
–

Planning
Design
Construction
Cutover
Advantages
Disadvantages


Agile Methodologies
• Overview
–
–
–
–

Requirements
Functional design
Code
Testing

• eXtreme Programming
– Simple design
• constraints

– Refactoring

Summary
•
•
•
•
•
•

Finalizing design specifications
Specifications documents
Structure charts
Prototyping
Rapid application development
Agile methodologies