The design process of a building project establishes function, form and performance for the final building. When multiple participants from varying professions are involved there is a serious problem in coordinating, communicating, and locating information around each design decision. Establishing ontology for this process, and using this ontology to structure all participant communication, will allow the requisite information from all participants to be considered for each design decision. This will greatly reduce rework and poor design decisions based on missed information. It will also ensure that participants are aware of all related information for their particular design tasks.