Page 264 - DMGT505_MANAGEMENT_INFORMATION_SYSTEM

Unit 14: Alternative System Building Approaches

Notes

Task Discuss the function of systems study stage.

Limitations of the Lifecycle Approach

The system lifecycle is still useful for building large complex systems that require a rigorous
and formal requirement s analysis, predefined specifications, and tight controls over the systems-
building process.

14.1.2 Prototyping

The prototype is working version of an information system or part of the system, but it is meant
to be only a preliminary model. Once operational, the prototype will be further refined until it
conforms precisely to users’ requirements.

Figure 14.2: The Prototyping Process
Identify
basic Step 1
requirements
Develop a
working Step 2
prototype

Use the
prototype Step 3

YES User
satisfied?
NO
Revise and
Operational enhance the Step 4
prototype
prototype
The process of developing a prototype can be broken down into four steps. Because a prototype
can be developed quickly and inexpensively, system builders, repeating step 3 and 4, it refine
and enhance the prototype before arriving at the final operational one.

Steps in Prototyping

Step 1: Identify the user’s basic requirements. The system designer works with user only long
enough to capture his or her basis information needs.
Step 2: Develop an initial prototype. The system designer creates a working prototype quickly,
using fourth-generation software, interactive multimedia, or computer aided software
engineering (CASE) tools.
Step 3: Use the prototype. The user is encouraged to work with the system in order to determine
how well the prototype meets his or her needs and to make suggestions for improving the
prototype.
Step 4: revise and enhance to prototype. The system builder notes all changes the user requests
and refines the prototype accordingly. After the prototype has been revised, the cycle returns to
step 3. And 4 are repeated until the user is satisfied.

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