Generic Procedure

Start with a high-level description of what the software/program does. Refine each part of the description by specifying in greater detail the functionality of each part. These points lead to a Top-Down Structure.

Problem in Top-Down Design Method

Mostly each module is used by at most one other module and that module is called its Parent module.

Solution to the Problem

Designing of reusable module. It means modules use several modules to do their required functions.

The design process for software systems often has two levels. At the first level, the focus is on deciding which modules are needed for the system based on SRS (Software Requirement Specification) and how the modules should be interconnected.

Function Oriented Design is an approach to software design where the design is decomposed into a set of interacting units where each unit has a clearly defined function.