# MathEntry – Defining an evaluation stage

You can inspect and change an evaluation stage by clicking on it. The single-line summary expands into a form.

The first part of the form specifies the criteria to match this stage. The second part defines the result in case the criterium does or does not match.

There are two types of evaluation criteria: equality or condition.

Equality criterium

You can specify that the input must be compared to one or more predefined answers. Use the evaluation mode to specify what kind of equivalence should be applied.

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Conditional criterium

A more general criterium than equality checking is the criterium based on a condition. Such a condition could be: “the input must be a positive number”. This can be written mathematically as $var>0$, where $var$ represents the student input.

The following example shows a stage that matches if the student input is an integer and even number.

You can define multiple conditions. The evaluation criterium matches when all conditions are valid.