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Classification Tree Method – How to crack ISTQB?

Appearing for ISTQB Advance Level exam? Decode the challenging topic "Classification Tree Method". Master the method with this tutorial.

Appearing for ISTQB Advance Level exam? Decode the challenging topic "Classification Tree Method". Master the method with this tutorial
While preparing for ISTQB exams, we are not sure on what we should study on the topic “Classification Tree Method.” In this article, we are sharing some tips, which will be helpful for those appearing for ISTQB advanced level exam.

Classification Tree Method is a black box testing technique to test combinations of features. Consider the scenario where user needs to test many features and it is impossible to test all the combinations or is time-consuming. We need to use Classification tree in such a situations.

“Classification Tree Editor” is the tool used to derive test cases for classification tree method. However, in ISTQB advanced level exam, questions asked will be to find the minimum/maximum number of test cases required by applying classification tree method without the tool. Let us discuss on how to calculate the minimum and maximum number of test cases by applying classification tree method.

In order to calculate the number of test cases, we need to identify the test relevant features (classifications) and their corresponding values (classes). By analyzing the requirement specification, we can identify classification and classes.

Let us analyze a sample scenario given below and find out the classifications and classes.

Consider a User Interface having one radio button, one drop down box having four values in it and a multi-select box having five values in it. Let us identify classifications and classes for this scenario.
ClassificationsNumber of Classes
Radio button2
Dropdown Box4
Multi-select Box5
Now, let us find out the minimum and maximum number of test cases by applying Classification Tree Method.

Minimum number of test cases = Number of classes in the classification which has maximum number of classes.
Maximum number of test cases = Cartesian product of all classes.

Applying the formula in the above scenario to find out the minimum and maximum number of test cases.

Minimum number of test cases = 5 (since multi-select box has five classes in it)
Maximum number of test cases = 40 (2 * 4 * 5 = 40)
Now, let us solve one sample question from ISTQB advanced level exam

Q Easy travel is a card, used for paying fares on buses and subways. User can store credit to the card at the Easy travel loading Machines and the system automatically deducts the fare on swiping the card in the card reader on a bus or at the subway station.
The system allows the user to load 10, 20, 30, 40 and 50 Euros or other user-defined amount to the card. There are four payment methods available: cash, credit card, debit card or pay-by-phone. Once transaction is complete, system allows user to view or print the balance on a receipt.
Using the Classification Tree method, what is the minimum number of test cases for 100% 1-wise coverage?
Options
A. 6 Test Cases
B. 2 Test Cases
C. 12 Test Cases
D. 3 Test Cases

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Aneejian: Classification Tree Method – How to crack ISTQB?
Classification Tree Method – How to crack ISTQB?
Appearing for ISTQB Advance Level exam? Decode the challenging topic "Classification Tree Method". Master the method with this tutorial.
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