This phase is the first step in moving from problem domain to solution domain. Starting with what is needed to how to obtain them.

The design phase focuses on

• Data structure
• Understanding what exactly the software must do is the most important factor
• Software architecture
• Procedural detail
• Interface design

Design phase is divided into 2 stages

• System (Preliminary) design
• Detailed design

System design defines components that are required

• General structure of software
• Major modules
• Functions provided by each module
• Interface between each module
• Major data structure
• Output format of the system

Detailed design defines

• On how each component can be implemented
• Specifies internal logic of each module specifying the algorithms and more detailed data structure

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