This module provides a comprehensive introduction to Building Information Modeling (BIM) with a specific focus on the role of the modeller in the Architecture, Engineering, and Construction (AEC) industry. It explains how BIM goes beyond traditional 2D drafting by creating intelligent, data-rich 3D models where every building element contains information such as dimensions, materials, quantities, and performance properties. The description introduces the core principles of BIM, including parametric modeling, model-based workflows, and lifecycle thinking, helping modellers understand how their work supports design, construction, and facility management stages.