Design Patterns Explained: A New Perspective on Object-Oriented Design

Dealing with Changing Requirements

To figure out a way around the problem of changing requirements and to see if there is an alternative to functional decomposition, let's look at how people do things. Let's say that you were an instructor at a conference. People in your class had another class to attend following yours, but didn't know where it was located. One of your responsibilities is to make sure everyone knows how to get to their next class.

If you were to follow a structured programming approach, you might do the following:

1.	Get list of people in the class.
2.	For each person on this list: a. Find the next class they are taking. b. Find the location of that class. c. Find the way to get from your classroom to the person's next class. ...