1. The BIM Concept Drawings, building views, visualizations, calculations and quantity take-offs are automatically derived from the 3D model. • BIM= Building Information Modeling • Also known as „Virtual Building” or „Building Simulation”

2. Working Concept – BIM • Single file concept:The complete building model and all of its representations are included in the BIM file • Real architectural elements used for modeling • Changes of the model affect all related drawings (and vice versa) • Automatic generation and updating of documentation • Architectural content (libraries) • Building information data attached to the elements • Additional materials (rendering, animation, quantity take-offs, schedules)

3. Evaluation– BIM Benefits • Compared to 2D and 3D CAD • Elements have architectural meaning • Changes on one drawing have influence on all others • Rich visualization content (animation, sun studies, renderings etc.) • Automatic quantity take-offs, schedules • Connection to structural, energy calculation, collision detection etc. software Drawbacks • Higher training requirements • Might be difficult to learn the BIM approach for people who were previously 2D users • Might be more difficult to handle complex geometry (e.g. freeform structures) then in 3D and 2D CAD