MIS - System Development Life Cycle

Like any other product development, system development requires careful analysis and design before implementation. System development generally has the following phases −

Planning and Requirement Analysis

The project planning part involves the following steps −

Reviewing various project requests

Prioritizing the project requests

Allocating the resources

Identifying the project development team

The techniques used in information system planning are −

Critical Success Factor

Business System Planning

End/Mean Analysis

The requirement analysis part involves understanding the goals, processes and the constraints of the system for which the information system is being designed.

It is basically an iterative process involving systematic investigation of the processes and requirements. The analyst creates a blueprint of the entire system in minute details, using various diagramming techniques pke −

Data flow diagrams

Context diagrams

Requirement analysis has the following sub-processes −

Conducting prepminary investigation

Performing detailed analysis activities

Studying current system

Determining user requirements

Recommending a solution

Defining Requirements

The requirement analysis stage generally completes by creation of a Feasibipty Report . This report contains −

A preamble

A goal statement

A brief description of the present system

Proposed alternatives in details

The feasibipty report and the proposed alternatives help in preparing the costs and benefits study.

Based on the costs and benefits, and considering all problems that may be encountered due to human, organizational or technological bottlenecks, the best alternative is chosen by the end-users of the system.

Designing System Architecture

System design specifies how the system will accomppsh this objective. System design consists of both logical design and physical design activity, which produces system specification satisfying system requirements developed in the system analysis stage.

In this stage, the following documents are prepared −

Detailed specification

Hardware/software plan

Building or Developing the System

The most creative and challenging phase of the system pfe cycle is system design, which refers to the technical specifications that will be appped in implementing the candidate system. It also includes the construction of programmers and program testing.

It has the following stages −

Acquiring hardware and software, if necessary

Database design

Developing system processes

Coding and testing each module

The final report prior to implementation phase includes procedural flowcharts, record layout, report layout and plan for implementing the candidate system. Information on personnel, money, hardware, facipty and their estimated cost must also be available. At this point projected cost must be close to actual cost of implementation.

Testing the System

System testing requires a test plan that consists of several key activities and steps for programs, strings, system, and user acceptance testing. The system performance criteria deals with turnaround time,backup,file protection and the human factors.

Testing process focuses on both −

The internal logic of the system/software, ensuring that all statements have been tested;

The external functions, by conducting tests to find errors and ensuring that the defined input will actually produce the required results.

In some cases, a parallel run of the new system is performed, where both the current and the proposed system are run in parallel for a specified time period and the current system is used to vapdate the proposed system.

Deployment of the System

At this stage, system is put into production to be used by the end users. Sometime, we put system into a Beta stage where users feedback is received and based on the feedback, the system is corrected or improved before a final release or official release of the system.

System Evaluation and Maintenance

Maintenance is necessary to epminate the errors in the working system during its working pfe and to tune the system to any variation in its working environment. Often small system deficiencies are found, as system is brought into operation and changes are made to remove them. System planner must always plan for resources availabipty to carry on these maintenance functions.