System Design Life Cycle (SDLC)

Definition: SDLC specifically refers to the set of processes or phases related to the design aspect within the broader SDLC. It concentrates on the detailed planning and creation of the system’s architecture, components, modules, interfaces, and data for a specific project.

Phases of SDLC:

1. Preliminary Design:
   • Defining overall system architecture.
   • Identifying major components and modules.
   • Establishing data storage and processing mechanisms.
2. Detailed Design:
   • Developing detailed specifications for each component/module.
   • Designing algorithms and data structures.
   • Creating interface designs.
3. Implementation:
   • Translating design specifications into executable code.
   • Developing and integrating individual components/modules.
   • Ensuring adherence to design principles and standards.
4. Testing:
   • Unit testing of individual components.
   • Integration testing to verify interactions.
   • System testing to validate the entire system.
5. Maintenance:
   • Correcting design-related issues.
   • Updating design documentation.
   • Adapting the design to accommodate changes.

Key Characteristics of SDLC:

• Primarily concerned with the design aspect of the information system.
• Emphasizes creating detailed specifications and plans for system components.
• Works closely with the broader SDLC but has a narrower focus.
• Iterative, with the design evolving based on feedback and testing results.

The System Development Life Cycle (SDLC) and System Design Life Cycle (SDLC) are two distinct but interconnected processes involved in the development of information systems.

Let’s explore each life cycle and highlight their key differences: