Page 212 - DCAP302_ENTERPRISE_RESOURCE_PLANNING

Enterprise Resource Planning

notes storage requirements

Identify organization, content, and size of databases, types and frequency of updating and
inquiries, and the length and rationale for record retention.
control requirements

Identify validation rules, security requirements, and adaptability requirements for the system
input, processing, output, and storage functions.
Finally, the overall system definition needs to be refined to prepare detailed software specifications
covering:
1. Information flow (DFD)
2. Interfaces
3. Functional requirements

4. Design requirements &constraints
5. Coding structures
6. Testing criteria
A Software Requirement Specifications (SRS) which is the basis for software development gets
prepared at this stage.

12.4.2 Design considerations

System analysis describes what a system, should do to meet the information needs of users.
Systems design specifies how the system will accomplish this objective and generates the system
specifications that satisfy the functional requirements identified in the earlier phase.
The design should be traceable to the analysis model. The design should “minimize the intellectual
distance” between the software and the problem and should be structured to accommodate
change. The design should be reviewed to minimize conceptual errors.
The overall structure of the software is the architecture of the software to be built.
It is a representation that enables a software engineer to:
1. Analyze the effectiveness of the design in meeting its stated requirements,

2. Consider architectural alternatives at a stage when making design changes is still relatively
easy, and
3. Reduce the risks associated with the construction of the software.

The design phase translates the SRS into a workable solution and defines the following:
1. Database Design defines the database structures and the data dictionary.
2. Menu Design defines the alternate options and selection mechanisms
3. Input Design defines the user interfaces to capture the information. It covers two aspects -
Input Form Design and Input Screen Design.
The input form is the basic input that is received from the external entity. In today’s environment,
depending on the application, it is possible to provide a screen to the external entity to input this
information. However there are situations where such a thing is not feasible and hence an input

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