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Procurement Phase and Systems Design

Procurement Phase and Systems Design. - Procurement Phase - Software Design. What is Systems Design ?. Systems design is the specification of a detailed computer-based solution. It is also called physical design .

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Procurement Phase and Systems Design

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  1. Procurement Phase and Systems Design - Procurement Phase- Software Design

  2. What is Systems Design ? • Systems design is the specification of a detailed computer-based solution. It is also called physical design. • The purpose of the systems design phase is to create a blueprint that will satisfy all requirements for the system.

  3. 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

  4. 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

  5. Strategies For Software Design • Modern Structured Design • Prototyping • JAD • RAD • Object-Oriented Design (OOD)

  6. 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.

  7. 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

  8. 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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