User assistance occurs within an action context--the user doing something with an application--and should appear in close proximity to the focus of that action--that is, the application it supports. The optimal placement of user assistance, space permitting, is in the user interface itself. We typically call that kind of user assistance instructional text. But when placing user assistance within an application as instructional text, we must modify conventional principles of good information design to accommodate certain forces within an interactive user interface. This column, User Assistance, talks about how the rules for effective instruction change when creating instructional text for display within the context of a user interface.