The document discusses Building Information Modeling (BIM). It states that BIM was introduced 12 years ago to distinguish information-rich 3D architectural modeling from traditional 2D drawings. BIM involves the creation and use of coordinated, internally consistent computable information about a building project during design and construction. It allows for reliable digital representation, high-quality construction documents, construction planning, performance predictions, and cost estimates. The document then discusses some essential parameters in BIM like axes used and inputs required from various disciplines like architecture, structure, MEP, etc. for BIM coordination.