Design Patterns Explained

294 Part V • Handling Variations with Design Patterns
Table 20-2 Filling Out the Analysis Matrix: First Concept
U.S. Sales
Calculate freight Use UPS rates
Now, I continue with the next piece of information, "use U.S. postal
rules for verifying addresses," by adding another row to hold that
piece of information, as shown in Table 20-3.
Table 20-3 Filling Out the Analysis Matrix: Second Concept
U.S. Sales
Calculate freight Use UPS rates
Verify address Use U.S. postal rules
I continue through all of the concepts in the first case, as shown in
Table 20-4.
Table 20-4 Filling Out the Analysis Matrix:
Complete First Case— U.S. Sales
U.S. Sales
Calculate freight Use UPS rates
Verify address Use U.S. postal rules
Calculate tax Use state and local taxes
Money U.S. $
2. Proceed through
the other cases,
expanding the
matrix as necessary
Now, I move to the next case and the other cases, one column per
case, completing each cell with as much information as I have. The
completed matrix for the next case is in Table 20-5.