Some principles of screen design and software for their support

The relatively unexciting issue of screen design has often been neglected in CAL or CAT. Changing technology and user requirements may make it more important. Authoring systems (languages, methodologies, software tools) need to satisfy certain requirements at different stages of the authoring process. Such requirements, relating to screen management, aesthetics, specification and documentation, implementation, maintenance and portability, are considered. Some can be met by adopting certain standards and techniques, and by the provision of software tools. Certain solutions are suggested, in particular, the software tools for screen design provided by a particular authoring system. COMBAT are described. These directly correspond to specification and documentation techniques, assist in implementation and maintenance, and help in the adoption of good design standards.