One of a number of ways in which measurements may be related to one another, which can occur where, for example, a test compares a user using a particular interface followed by the same user using a different interface. Types of order effects include: positive learning effects, where the user is better at the second interface because they have already become familiar with the application while using the first; and interference effects, where the user does less well in the second interface because they have got used to the features of the first.
Defined on page 32
Used on pages 32, 33, 111, 112