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