development of information system
- 1. TOPIC : Development of Information System From: Sowmya C N Sowmya L MLA ACADEMY OF HIGHER LEARNING
- 2. 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
- 3. Steps : Steps involved in developing information system
- 4. The steps involved in developing an Information System are: 1. Analysis 2. Feasibility Study 3. System Design 4. Testing 5. Implementation 6. Documentation
- 5. 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
- 6. 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
- 7. The areas that need to be considered in the design process are listed below: 1. Inputs 2 Outputs 3. File Design 4. Hardware 5. Software Design
- 8. 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
- 9. a) Details of the children looked after within the nursery. Design - Outputs Some of the outputs for a system for a nursery might be: Name Smith, Tony Jackson, Jake Timms, Tony Fogett, Carol Address 12 Fields Rd 9 Man Gdns 87 Colly Row 9 Shaw St Telephone No. 0543 3445545 0563 9545752 0543 8653653 0563 9657564 Membership No. 001342 001234 001789 001455
- 10. 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
- 11. Design - Hardware This 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 – Software A decision will have to be made as to what software to use. The most common software packages are databases, spreadsheets and word processing packages.
- 12. 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
- 13. Implementing or introducing a new system can be done in two ways: 1. Direct Implementation 2.Parallel Running Implementation
- 14. • A number of documents are produced during the development of a new computer application. Essentially there are two types: 1.User Guides 2.Technical Documentation Documentation