An apparatus and method for providing a user interface through which a user may generate a conditional expression are provided. The user interface provides guidance to a user as to the proper parts of the conditional expression to include in the conditional expression as the user constructs the conditional expression. Thus, as the user completes parts of the conditional expression, the guidance that is offered is updated based on the current context of the conditional expression. This guidance may include listings of variables, attributes and/or functions that are most appropriate to be entered next in the conditional expression, help text, and the like.