[TAD: A unique BIM that is for the rest of us TAD (The Architect's Desktop) is an early stage Building Information Modeller. It does not work like other IFC based BIM such as Revit, Archicad, etc. Instead it has a simple approach to designing where it uses spaces to model all architectural elements. It is best suited for those countries that do not really employ standardized building components. Namely developing countries such as India, Pakistan, Sri Lanka, African countries, Cambodia, Vietnam and so on]