Design Methods | Process Of Software Development | Compilation

Design Methods

Designing is the first step for obtaining solution of a given problem.The purpose of designing is to represent solution for a system.It is difficult to design a large system because the complexity of system cannot be represented easily. Some of the design methods are given below.

1. Top-Down Design

Every system has several hierarchies of components.The top level represents the whole system.

Top-Down design starts from top level component to lowest components.In this design method,the system is divided into some major components. Then each major component is divided into lower level components.Similarly other components are divided until the lowest level component.

2. Bottom-Up Design

Bottom-Up design method is reverse of Top-Down design approach.It starts from the lowest level components to the highest level components. It first designs the basic components and from these basic components highest level components are designed.

3. Modular Approach

In this,a large program / system is divided into modules. Module is logically a well-defined part of program which has its own specific task.It is easy to modify a program written in modular approach.It is also easy to check for bugs.

Process Of Software Development

Software is a collection of program and a program is a collection of instructions given to the compiler. Development of software is a stepwise process, before developing a software a number of processes are done.

following are the steps:

1.User Requirement

2.Problem Analysis

3.Determine Input Output

4.Design Algorithm

5.Programming

6.Testing/Debugging

7.Documentation

Compilation Process