This evaluation type checks if the variable in the Definition field is present in the operator of the Definition field. i.e. times,x checks whether there is a multiplication that has a variable x as a descendant in the student’s answer. Example:

The second argument in the Definition can be a list, where multiple variables can be searched with an OR. For example, the following rule checks whether there is a division that has x or y as a descendant.

An optional third argument in the Definition specifies the position of the child. For example, the following rule checks whether the denominator (and not the numerator) of a fraction has an x or y in it.

Moreover, this rule checks whether there is an x in the left argument of a multiplication:

❗ Note: if your feedback rule doesn’t seem to work for some reason, try deleting any spaces in the feedback Definition.

Below are some examples of what the automated feedback of this evaluation type looks like:

An overview of all evaluation types can be found here (for mathematical answers) and here (for text-based answers). More detail on the different fields of a feedback rule can be found here.