Week 1

Software Components

• Example: Amazon
  • Inventory Management System: Updates based on purchasing trends.
  • Payment Gateway: Manages transactions.

Key Point: Large software systems are made up of separate components (modules) that work together to fulfil requirements.

Requirement Specification

• First Step:
  • Study existing components to understand interaction.
  • Analyse similar systems for features (e.g., PayTM, PhonePe).

Requirements:

• Define goals of the system.
• Must meet client needs (e.g., mobile banking for bank customers).

Clients:

• External Users: End customers.
• Internal Users: Company employees.
• Other Software: Systems interacting with the software (e.g., payment gateways).

Key Point: Understanding client needs is crucial in the requirement specification phase.

Software Design and Development

• Challenges without design:
  • Developers may have different implementation ideas.
  • Integration issues.
  • Big picture view is necessary for adding features.

Design:

• Provides a structure for the software system.
• Helps visualise the big picture.

Development Phase: