The document provides conditional recommendations on dialogue design, input design and output design for computer dialogues in which form filling and dialogue boxes are used to accomplish typical office tasks. Form filling dialogues are dialogues in which the user fills in, selects entries for, or modifies labeled fields on a "form" or a dialogue box presented by the system. Often the system then creates, or updates the data base associated with the form. Form filling entries typically are in the form of typed input (abbreviations, or full names) or selections from available option lists. The recommendations relate to the three major design components of user interfaces, i. e. dialogue, input and output. The terms entry field, field, form, label, navigation, optional field, protected field and required field are defined.