## equivalence class

An equivalence class is a subset whose elements are related to each other by an equivalence relation. The equivalence classes of a set under some relation form a partition of that set (i.e. any two are either equal or disjoint and every element of the set is in some class).

Last updated: 1996-05-13

## equivalence class partitioning

<*testing*>

A software testing technique that involves identifying a small set of representative input values that invoke as many different input conditions as possible.

For example, for binary search the following partitions exist: inputs that do or do not conform to pre-conditions, Inputs where the key element is or is not a member of the array. One can combine these into finer partitions. One can also pick specific conditions of the array, e.g. a single value, even or odd number of elements. One should look at boundary conditions, e.g. inputs where the key element is the first or last element in the array.Last updated: 2004-01-18

### Nearby terms:

Equel ♦ **equivalence class** ♦ equivalence class partitioning ♦ equivalence partitioning

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