Automation of PESCO (Chapter-4)

 

SYSTEM DESIGN

                

                                                  MAIN TOPICS COVERD

·         Input Design

·         Output Design

·         Code Design

·         User Interface Design

·         Database Design

 

 

4.1    Input Design:

The input design plays a very important role to provide relevant data for processing and producing result. Well-designed forms increase the level accuracy. The computerized data base system requires manually prepare documents to provide input data to the data entry operator, who is responsible to enter the correct data into the system. A good data entry system should be designed to give an over all responsible performance.

4.1.1. Planning

            Planning is the first phase of database development process (information engineering). The goal of planning is to align information technology with strategies of the organization. Organizations can achieve a competitive advantage when they are able to develop a series of practice information plans and convert those plans in to series of practical information system projects.

·         Information systems planning is accomplished in three steps

·         A functional decomposition diagram, showing the break down of high-level organizational functions into low-level supporting functions.

·         A set of planning matrices that links the various components in the sub models.

·         Function decomposition is the process of breaking function of an organization down into progressively greater level of detail.

4.1.2. Characteristics of a well-designed system:

• Acceptability:

Success of new system depends upon its acceptance or rejection by organization personal. System should be designed in such a way that it should be welcomed by the organization as well as operating personal. It is necessary for the operating personal of the organization to participate in the project team in every phase of changing over because they constitute the organization, which must live with the newly designed system.

• Decision Making Ability:

A well-designed system also produces information that facilitates decision-making.

• Flexibility:

The newly designed system must be flexible in nature. It must be capable of adopting the environmental changes.

• Reliability

The reliability of the new system refers to the new consistency of operation. Data inputs, processing modes, procedures and the informational out put must be consistence over an extended period of operation.

• Simplicity

The trademark of newly designed information is composed of the         simplicity. The newly designed system, simplicity must be provided with the straight-line flow from one step to next, avoid needless backtracking and duplication.