(See also under users) Related to Krashen’s Monitor hypothesis, where he suggests three types of monitor user: over users, optimal users and under users. The monitor functions to check what we are going to say against what we know and either allow the thought to be spoken or held back. Under users often are confused in their speech because they did not monitor their thoughts. Over users of the monitor speak erratically because of the time they are using to check their own thoughts before speaking. Optimal users get the balance right.