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needs and what the system must do. One of the most important factors in building correct
systems therefore is to first clearly define what the system must do. There are two major
steps the first step is to agree on a broad conceptual solution; the next step is a detailed
analysis of user requirement followed by system specification. There are many ways to
develop User requirements. One of these, however, is not simply sitting down and
drawing a model of the system or setting user requirements in the privacy of an office. It
can only be down by going out and discussing with users what they require of the system
and then building systems that satisfy these requirements. Thus, in summery, it is
necessary to determine the best way to identify requirements and then to spend time
studying and observing how the system works and what is needed to upgrade the system
How to make
sense of the
usage world?
How to represent
information of the
subject world
Subject World
Analysis
Model
Requirement
Model
Usage
World
Scenarios
System
World
Design
Model
User
manual
How to
uses the
System
System
Specification
How to design
the System
Development World
Computer
System
Figure: 4.4 The world in System Development