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How are redundancies and contradictions in a decision table found?
Wiki User
∙ 13y ago
Redundancies is found when there are 2 rules no matter what condition is that, the final action are the same. For example,
1st rule: if today is Raining day and if it is Weekend, the action is Stay at home.
2nd rule: if today is Raining day and if it is Not Weekend, the action is Stay at home.
So no matter it is Weekend or not, the action will be Stay at home. This is called redundancies. As a result, we will remove 1 rule and write the rules like this:
Condition/Action Rule
1
Raining Day Y
Weekend -
Stay at home X
The dashes (-) means Y or N.
Contradictions is found when there are impossible rules which there are 2 rules with different action but have the same condition meet. This is occured when the dashes(-) are incorrectly inserted into the table.For example,
Condition/Action Rules
1 2
Salary> $50000/year Y Y
Salary< $2000/month - -
Work> 5 years Y Y
2% bonus X
5% bonus X
no bonus
Can you see? Although the 2 rules are Salary > $50000/ year and Work > 5 years, but the Bonus entitled are not the same. This is called contradiction.
Wiki User
∙ 13y ago
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