Decision tree :
A decision tree gives a graphic view of the processing logic involved in decision making and the corresponding actions taken. The edges of a decision tree represent conditions and the leaf nodes represent the actions to be performed depending on the outcome of testing the condition.
Example: -
Consider Library Membership Automation Software (LMS) where it should support the following three options:
New member option-
Decision: When the 'new member' option is selected, the software asks details about the member like the member's name, address, phone number etc.
Action: If proper information is entered then a membership record for the member is created and a bill is printed for the annual membership charge plus the security deposit payable.
Renewal option-
Decision: If the 'renewal' option is chosen, the LMS asks for the member's name and his membership number to check whether he is a valid member or not.
Action: If the membership is valid then membership expiry date is updated and the annual membership bill is printed, otherwise an error message is displayed.
Cancel membership option-
Decision: If the 'cancel membership' option is selected, then the software asks for member's name and his membership number.
Action: The membership is cancelled, a cheque for the balance amount due to the member is printed and finally the membership record is deleted from the database.
Decision tree representation of the above example -
The following tree shows the graphical representation of the above example. After getting information from the user, the system makes a decision and then performs the corresponding actions
A decision tree gives a graphic view of the processing logic involved in decision making and the corresponding actions taken. The edges of a decision tree represent conditions and the leaf nodes represent the actions to be performed depending on the outcome of testing the condition.
Example: -
Consider Library Membership Automation Software (LMS) where it should support the following three options:
- ƒ New member
- Renewal
- Cancel membership
New member option-
Decision: When the 'new member' option is selected, the software asks details about the member like the member's name, address, phone number etc.
Action: If proper information is entered then a membership record for the member is created and a bill is printed for the annual membership charge plus the security deposit payable.
Renewal option-
Decision: If the 'renewal' option is chosen, the LMS asks for the member's name and his membership number to check whether he is a valid member or not.
Action: If the membership is valid then membership expiry date is updated and the annual membership bill is printed, otherwise an error message is displayed.
Cancel membership option-
Decision: If the 'cancel membership' option is selected, then the software asks for member's name and his membership number.
Action: The membership is cancelled, a cheque for the balance amount due to the member is printed and finally the membership record is deleted from the database.
Decision tree representation of the above example -
The following tree shows the graphical representation of the above example. After getting information from the user, the system makes a decision and then performs the corresponding actions
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