Need of analysis and design

Analysis and design should be done before coding because coding without a plan leads to wrong, costly and hard-to-maintain programs.

• Clear understanding: analysis tells exactly what the inputs, outputs and requirements are, so the right problem is solved.
• Correct logic: designing an algorithm and flowchart lets us check the logic on paper, where mistakes are cheap to correct.
• Saves time and cost: errors found after coding take much more effort to fix.
• Efficient and structured code: a good design chooses a better method, data structure and modules.
• Easy coding: each step of the design converts directly to statements.
• Fewer bugs and easier testing: a planned program has fewer logical errors.
• Documentation and teamwork: the design can be shared and used for later maintenance.