Page 176 -

DOMAIN MODELING OF OBJECT-ORIENTED INFORMATION SYSTEMS 161
Figure 9.6 Another Domain Model for the Gymnastics System: With Minimum Number
of Classes

Assign
Team Event Judge to
Event

Qualified
Competition Competition for
Club Meet Event Type Judge
Type

Gymnast Member

Award
score

A Typical Procedure of Text Analysis Method

The following is a summary of the description of the text analysis method given in Rumbaugh
and colleagues (1990, p. 153). It is a typical procedure and has been adopted by various other
authors. It consists of the following steps:

• Extract the nouns and noun phrases from the problem statement.
• Make a list of candidate classes.
• Separate the good classes from the bad ones. Eliminate the following: (1) Redundant classes,
(2) Irrelevant classes, (3) Vague classes, (4) Attributes, (5) Operations, (6) Roles, and (7)
Implementation constructs.

How the Procedure Would Perform in Practice

Upon reflection, it can be seen that the procedure is based on the following premises:

• Premise 1: The classes for the analysis model can be found among the nouns and noun phrases
contained in the problem statement.
• Premise 2: The nouns and noun phrases contained in the problem statement can be a valid
or an invalid candidate class. The way to distinguish between them is to apply a number of
criteria (such as the ones in the procedure above).

The first premise places a lot of responsibility on the problem statement. How should the
problem statement be written so that it can fulfill these responsibilities—that is, to ensure that it