Database Reference
In-Depth Information
Repeat these steps until you've worked through all the mission objectives. Here's an ex-
ample of how you use these techniques to review the mission objectives.
Assume that you're designing a database for a flight training school. You're just starting
this particular process, and you've just used the Subject-Identification Technique on the
following statement:
We need to maintain data on our
pilots
and their
certifications
.
You now cross-check the subjects you identified in this mission objective against the items
in the Preliminary Table List shown in
Figure 7.7
.
Figure 7.7. The Preliminary Table List for a flight training school
In this case, you cross out “pilots” in the mission objective statement because it already
exists on the Preliminary Table List and it represents the same subject. You then decide to
examine “certifications” further, and, after some careful thought, you make these observa-
tions.
1.
It does not appear on the Preliminary Table List.
2.
It doesn't duplicate any item on the Preliminary Table List.
3.
Its name is not synonymous with any item on the Preliminary Table List.
4.
It doesn't represent the same subject as any other item on the Preliminary Table
List.
