A model of the design process and related knowledge and expertise is applied to develop an advanced, computer-based building design support environment (BDSE). The BDSE will support building design from the initial schematic phases through working drawings and specifications to a building's construction, occupancy, and use. The BDSE will consist of imaging, simulation, and expert systems software, linked in a multimedia environment containing handbooks, product catalogues, and cases studies. The structure of the BDSE is presented with emphasis on modelling the building design process and related knowledge. All BDSE modules will operate on the three common hierarchical data structures that describe the building, its context, and its performance. The interrelations among the BDSE modules are compatible with the iterative nature of the design process. An issue-based information system (BIS) will be used to fully record the design process so that it will be transparent and traceable. Presentation of the structure of the expert system module emphasises the identification, organisation, and application of appropriate building design knowledge. Finally, methodology for acquiring knowledge to develop a prototype knowledge base for designing fenestration systems is presented, along with preliminary findings and future plans.

KEYWORDS: calculating, buildings, designing, computers, expert systems, computer programs, case studies, handbooks, catalogues.