Information system

TOPIC : Development of Information System

From: Sowmya C N Sowmya L

MLA ACADEMY OF HIGHER LEARNING

An information system is any organized system for the collection, organization, storage and communication of information. More specifically, it is the study of complementary networks that people and organizations use to collect, filter, process, create and distribute data.

Information system

Steps :

Steps involved in developing information system

The steps involved in developing an Information System are:

1.Analysis2.Feasibility Study 3.System Design 4.Testing5.Implementation6.Documentation

This is a very important part in the development of an Information System and involves looking at an organization or system (such as a nursery school) and finding out how information is being handled at the moment.

Analysis

The aim of a feasibility study is to see whether it is possible to develop a system at a reasonable cost. At the end of the feasibility study a decision is taken whether to proceed or not. A feasibility study contains the general requirements of the proposed system.

Feasibility study

The areas that need to be considered in the design process are listed below:

1. Inputs2 Outputs3. File Design4. Hardware5. Software

Design

To work out the inputs required for a system several questions need to be addressed: What data needs to be entered into the computer system?

How much data needs to be input, and how often?

Where does the data come from? How will the data be entered into the

system?

Design - Inputs

a) Details of the children looked after within the nursery.

Design - Outputs Some of the outputs for a system for a nursery might be:

NameSmith, TonyJackson, JakeTimms, TonyFogett, Carol

Address12 Fields Rd9 Man Gdns87 Colly Row9 Shaw St

Telephone No.0543 34455450563 95457520543 86536530563 9657564

Membership No.001342001234001789001455

Field Type Length Example

Membership No. Numeric 6 352600 Surname Text 20 McSweeney First Name Text 15 Jane Address line 1 Text 25 3 Longlane Address line 2 Text 25 London Post Code Alpha numeric 10 N1 1TH Telephone No. Alpha numeric 10 0181-366-1234 Fees Paid Text 1 Y Fee Date Date 8 22/04/97

Design - File Design

Design - HardwareThis section covers the types of computers and printers thought suitable for the system being analysed. If the system needs to be on a network, details would be specified here.

Design – SoftwareA decision will have to be made as to what software to use. The most common software packages are databases, spreadsheets and word processing packages.

Any new system needs to be thoroughly tested before being introduced. First of all the system should be tested with normal data to see if it works correctly.Secondly, the system is tested with data containing known errors to try and make it fail ('crash').Thirdly, the system is tested with very large amounts of data to see how it can cope.

It is important that processing time and response rates remain acceptable with varying amounts of data

Testing

Implementing or introducing a new system can be done in two ways: 1. Direct Implementation2.Parallel Running

Implementation

• A number of documents are produced during the development of a new computer application. Essentially there are two types:

1.User Guides2.Technical Documentation

Documentation