1. Decision Tables

2. Lesson Objectives
Understand how to model complicated logic using a logic table
Determine logical conditions and consequential actions.

3. An overview
Decision tables are a precise yet compact way to model complicated logic.
Just like IF-else statements Decision tables link conditions with actions
The advantage of decision tables is that we can join many separate conditions with several actions

4. An Example Take the following bit of code
IF X is greater than 6 n Y is less than 7
Then Output “Pass”
Else Output “Fail”
Conditions
X > 6 Y N
Y < 7
Actions
Output “Pass” X
Output “Fail”

5. Why have them?
Decision tables make it easier to observe that all possible conditions are accounted for.
Decision tables can be used for:
Specifying complex program logic
Generating test cases (Also known as logic-based testing)

6. Have a go Complete a decision table for the following logic
If X is greater than 6 and Y is less than 7 or Z is equal to 3
Then Output “Pass”
Else Output “Fail”

7. Have another go!
Create a decision table for the following program in an office system
Send when Recipient address present, subject present, before 5:30pm
If after 5:30pm then put in pending folder
If Recipient address missing or subject message, give warning message