INTRUDUCTION TO SYSTEMS ANALYSIS AND DESIGN

IS

A Collection of components that work together to realize some objectives forms a system.

Consequently

Every system has three major components

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Input

Processing

Output

System life-cycle

An organizational process of:

IS

MAINTAINING SYSTEMS

DEVELOPING

A combination of:

MEANS

VARIOUS ACTIVITIES

THAT

HELPS

STABLISHING A SYSTEM PROJECT PLAN

PHASES OF SYSTEM DEVELOPMENT LYFE CYCLE

Preliminary system study

Feasibility Study

Detailed system study

System analysis

System Design

Coding

Testing

Implementation

Maintenance

It is necessary to:

Eliminate errors in the system during its working life

To tune the system to any variations in its working environments

Is the stage of a project during which theory is turned to practice

The major steps involved in this phase are:

Conversation

User training

Acquisition and installation of hardware and software

Documentation

It is an important phase of a successful system

After codifying the whole programs of the system, a test plan should be developed and run on a given set of test data

It is the most crucial phase in the developments of a system

Normally the design proceeds in two stages:

Preliminary or general design

Structured or detailed design

The system desgn needs to be implemented to make it a workable system, this demands the coding of design into computer inderstandable langauge, programing language.

Is the first phase of a system development life cycle

This is a brief investigation of the system under consideration

This is basically the test of the proposed system in the light of its workability, meeting user´s requirements, effective use of resources an the cost effectiveness

The detailed investigation of the system is carried out accordance with the objectives of the proposed system

System analysis is a process of collecting factual data, understand the processes involved, indentifying problems and recommending feasible suggestions for improving the system functioning