INTRODUCTION TO SDLC
SDLC system development method involves the system undergoing through various stages in order to be used. There are seven stages involved in SDLC, namely;
1. Problem recognition and definition
In this stage, we will seek to answer two questions
Once the business-planning process determines the need for a new system, there are four steps to defining the system:
Assessing the feasibility of the project
The feasibility study is basically the test of the proposed system in the light of its workability, meeting user’s requirements, effective use of resources and of course, the cost effectiveness.
Types of feasibility
Economic feasibility - The likely benefits outweigh the cost of solving the problem which is generally demonstrated by a cost/ benefit analysis.
Operational feasibility - Whether the problem can be solved in the user’s environment with existing and proposed system workings? It establishes the extent to which the users are comfortable or happy with the proposed or the new system.
Technical feasibility - Whether the problem be solved using existing technology and resources available?
Schedule feasibility – This establishes whether the development of the proposed system will be accomplished within the available time.
This is the process of acquiring data that should be used to design the proposed system this process is also called fact finding or information gathering.
Some of the methods used to collect data include:
1. Studying available documentation
This requires the system analyst to study the system and procedures needed to arrive at certain objective. This will be the source of information that could be used to design the proposed system.
An interview is a face-to-face meeting especially official in nature. A system analyst will seek to find answers to challenges through conducting interviews to stakeholders and staff. For a successful interview, the following guidelines should be followed:
A questionnaire is a special purpose document that allows a person to collect information and opinions from the people who receive and respond to it.
Advantages of questionnaires
This is the action or process of observing something or someone carefully in order to gain information. This method exposes the system analyst about the challenges at place as he/she seeks solutions to these challenges.
5. Automated Methods
Automated is used when the system analyst wants to get actual data which may be difficult to get through interviews, observations and questionnaires. Such data may be collected using devices that automatically capture data from the source, for example, video cameras, tape recorders etc.
Preparing and presenting the fact finding report
At the end of the information gathering stage, the analyst must come up with requirements definition report that has the following details:
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