Requirement Analysis Tasks
The requirements analysis task is a process of discovery refinement, modelling and specification. The software scope is initially established by the software engineer and refined during software project planning in detail. Models of the information, operation behaviour and control flow, and data domains are created and at last specification is made. To initiate this task first alternative solutions are analyzed and allocated to various software elements. After allocation the following steps are performed one by one.
1. problem recognition
2. problem evaluation and synthesis
5. Validation criteria
1. Problem Recognition: In the starting the system analyst studied the system specification and software project plan to have the basic idea of the problem to understand it so it is essential for him , to have the complete base about the software. Then he reviews the scope which was used to make the planning estimations. After having such over view of the software to be built, a communication must be established to be sure about the problem recognised. So the analyst will communicate with the management and the technical staff of the user customer organization and the software development organization. The project manager acts as a coordinator of the meeting of the software to discuss the important aspects of the software to be followed. The goal of the analyst is recognition of the basic problem elements as perceived by the user customer.
2. Problem Evaluation and Synthesis: This is the next step to be followed where the analyst must evaluate:
The flow and content of information.
Define and describe all software functions.
Understand software behaviour that affects the system.
Various system interface characteristics. And
Uncover design constraints.
Each of these tasks is used to describe the problem so that the overall approach or solution may be synthesized. Once problem have been identified, the analyst determines the system.
After getting the desired information the analyst begins to synthesize one or more solutions. This process of evaluation and synthesis step will be continued until both analyst and customer feel confident that software can be adequately specified for subsequent development steps. During this task the analyst s main concern is on what to be accomplished not how to accomplish.
3. Modelling: During this task the analyst creates one or more models of the system. A model presents an abstract description of the system. These models also act as a bridge between the user's customers and the development as the models are easily understandable by all the parties. Generally models simplify the situation and picks out most important aspects of a situation. It is imperative that the analyst selects the most suitable model for the situation at hand and uses more than one model, if necessary.
4. Specification: It is an agreement between the end use and system developer. Generally the specification is a document that completely describes what the proposed software should do without describing how the software will do it. The basic goal of the requirement phase is to produce the SRS, which describes the complete external behaviour of the proposed software.
5. Validation Criteria: Once basic information functions performance, behaviour and interfaces are described, validation criteria are specified to demonstrate understanding of a successful software implementation.
6. Review: As the last step, the review is conducted to check the progress of the project and to check whether all the work is performed well according to the user requirement. During the review the review the review members may give their comments feedbacks or praise on the work done. And as a result of review modify function, performance, information representations, constraints or validation criteria.
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