1. IS Development Methodology
Hele.Mai Haav:
CSC230-Spring 2003
IS Development Methodology

2. Objectives: Describe each of the steps of IS development cycle
Explain the usage of computer aided systems engineering in the process of IS development
Use the systems development cycle, and a model of information systems components as problem-solving frameworks to help you to propose IS solutions to simple business problems (Term project)

3. Developing IS Solutions
systems approach applied to the development of IS solutions to business problems
It is a major responsibility of today’s managers.

5. The Systems Development Cycle
1. Investigations
2. Analysis
3. Design
4. Implementation
5. Maintenance

7. Systems Investigation
Do we have a business problem?
What is causing the problem?
Would a new IS help solve the problem?
What would be a feasible IS solution to our problem?

8. Feasibility studies
is a preliminary study to investigate the information needs of users and determine the resource requirements, costs, benefits, and feasibility of a proposed project.

10. Organizational feasibility
How well the proposed system supports the strategic objectives of the organization
Technical feasibility
Hardware and software capability, reliability, and availability.
Economic Feasibility
Cost savings, increased revenue and profits, decreased investments
Operational feasibility
End-user acceptance, management support, customer, supplier and government requirements

11. Cost analysis - a part of feasibility studies
Tangible costs: costs of hardware, software, employee salaries, etc.
Intangible costs: difficult to quantify, for example, the loss of customers goodwill caused by disruptions arising from the installation of a new system

12. Benefit analysis
Tangible benefits like increase in sales or profit, decrease in information processing costs, increased operational ability and efficiency, etc.
Intangible benefits: improved customer service and management decision making, improved business and community image, improved competitive position, etc.

13. The result of feasibility study
is a report which includes preliminary specifications and a developmental plan for the proposed system.
If management of the firm approves the recommendations of the feasibility study, the system analysis stage can start.

14. Systems Analysis
describes what a system should do to meet the information needs of users
It is detailed study of
the information needs of the organization and end users
the activities, resources, and products of any present IS
the IS capabilities required to meet your information needs, and those of other end users
RESULT Functional Requirements

16. Systems Design
specifies how the system will accomplish the objective described on system analysis stage
Systems design can be viewed as the design of
user interfaces (screen, form, report, and dialog design
data (data structure design)
process (program and procedure design)

18. Systems Design
RESULT
system specification satisfying the functional requirements developed in the systems analysis stage

19. System specification User interface specification
Database specification
Software specification
Hardware and facilities specification
Personal specifications

20. Systems Implementation and Maintenance
Systems Implementation involves
hardware and software acquisition,
software development,
testing of programs and procedures,
development of documentation,
and systems installation.

21. Systems Implementation and Maintenance
Systems Maintenance involves
the monitoring,
evaluating, and
modifying of a system to make necessary improvements.