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System Design Definition

system design is the evaluation of different alternatives and the specification of a detailed solution to a problem information

has 3 phases:

1. selection system design.
2. Acquisition System Design.
3. design and systems integration.

design of systems selection

Objectives:

1. identify and investigate alternative solutions manual and computer type that can provide support for obtaining information system.
2. evaluate the feasibility of alternative solutions and recommend the best of these from a global perspective.

selection activities

1. Specify alternatives

2. Analyze the feasibility of alternative solutions:

• Technical feasibility
• operational feasibility
• economic feasibility
• Feasibility time

(It results in a matrix for evaluating alternative candidates)

3. Recommend a solution to the information system

The product of this phase is a proposed formal systems containing the plans, estimated size, candidate solutions, feasibility analysis and a selection

Acquisition design

Objectives:

1. Identify and research specific products that could serve to support the recommended solution for the system information object.
2. solicit, evaluate and rank the proposals from potential suppliers.
3. Select and recommend the best of these proposals.
4. prescribe the integration of products from selected suppliers.

Activities

1. Investigate options and technical criteria

2. solicit proposals (or quotes) to vendors

3. Validate the statements and performance expressed by the sellers

4. Evaluate and rank the proposals from vendors

5. Make the contract and inform vendors unselected

6. Establish integration requirements

Design Design and Integration Systems

has a double objective:

1. First, and as a top priority, design a system that meets the needs and attractive to end users.
2. Present clear and complete specifications.

Design:

1. Networks
2. Data
3. Procedures

Technology and Persons:

1. Analyze and distribute data

2. Analyze and distribute processes

3. Split into design units

4. I design databases files

5. Designing computer inputs and outputs

6. Designing interactive user interfaces

7. Present and review the design