IFS310: Module 9 Systems Design - Procurement Phase - Software Design.

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Presentation transcript:

IFS310: Module 9 Systems Design - Procurement Phase - Software Design

IFS310: Module 9 What is Systems Design ? Systems design is the evaluation of alternative solutions and the specification of a detailed computer-based solution. It is also called physical design

IFS310: Module 9 From Definition Phase Business Requirements Vendors Users

IFS310: Module 9 Configuration Phase Define Candidate Solutions Analyze Feasibility of Alternative Solutions Recommend a System Solution

IFS310: Module 9 Hardware and Software Acquisition (Procurement Phase) Research technical criteria (if necessary) Solicit proposals and/or quotes from vendors (a letter) Evaluate vendor proposals and a congratulation letter

IFS310: Module 9 Design and Integration Phase Analyze and Distribute Processes Analyze and Distribute Data Design Files and Database(s) Design Computer Outputs and Inputs Design User Interfaces Present and Review Design

IFS310: Module 9 Strategies For Software Design Modern Structured Design Prototyping JAD RAD Object-Oriented Design (OOD)

IFS310: Module 9

Modern Structured Design Structured design seeks to factor a program into the top-down hierarchy of modules. The software model derived from structured design is called a structure chart.

IFS310: Module 9 Representing Design Specifications Structure Charts –Shows how an information system is organized in hierarchical modules –Shows how parts of a system are related to one another –Shows breakdown of a system into programs and internal structures of programs written in third and fourth generation languages

IFS310: Module 9

Highly Cohesive and Loosely Coupled Modules should be highly cohesive; that is, each module should accomplish one and only one function. Modules should be loosely coupled; in other words, modules should be minimally dependent on one another.

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