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{{About|a software testing methodology|decision trees and prediction modeling using them (known as Classification tree)|Decision tree|and|Classification tree}}
The '''Classification Tree Method''' is a method for test design,<ref>{{cite book|last=Bath|first=Graham|author2=McKay, Judy|title=The software test engineer's handbook : a study guide for the ISTQB test analyst and technical test analyst advanced level certificates|year=2008|publisher=Rocky Nook|___location=Santa Barbara, CA|isbn=9781933952246|edition=1st}}</ref> as it is used in different areas of [[software development]].<ref name=advStest>{{cite book|last=Hass|first=Anne Mette Jonassen|title=Guide to advanced software testing|year=2008|publisher=Artech House|___location=Boston|isbn=1596932864|pages=179–186}}</ref>
It was developed by Grimm and Grochtmann in 1993.<ref name=GG>{{cite journal|last=Grochtmann|first=Matthias|author2=Grimm, Klaus|title=Classification Trees for Partition Testing|journal=Software Testing, Verification & Reliability|year=1993|volume=3|issue=2|pages=63–82|doi=10.1002/stvr.4370030203}}</ref>
Classification Trees in terms of the Classification Tree Method must not be confused with [[decision tree]]s.
The classification tree method consists of two major steps:<ref name=lkk>{{cite book|last=Kuhn|first=D. Richard|author2=Kacker, Raghu N. |author3=Lei, Yu |title=Introduction to combinatorial testing|year=2013|publisher=Crc Pr Inc|isbn=1466552298|pages=76–81}}</ref><ref name=pierre>{{cite book|last=Henry|first=Pierre|title=The testing network an integral approach to test activities in large software projects|year=2008|publisher=Springer|___location=Berlin|isbn=978-3-540-78504-0|page=87}}</ref>
# Identification of test relevant aspects (so called ''classifications'') and their corresponding values (called ''classes'') as well as
# Combination of different classes from all classifications into [[test case]]s.
The identification of test relevant aspects usually follows the (functional) [[specification]] (e.g. [[requirements]], [[use case]]s …) of the [[system under test]].
These aspects form the input and output data space of the test object.
The second step of test design then follows the principles of combinatorial test design.<ref name=lkk />
While the method can be applied using a pen and a paper, the usual way involves the usage of the [[Classification Tree Method#Classification Tree Editor|Classification Tree Editor]], a software tool implementing the classification tree method.<ref name=GW />
== Application ==
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