Figure 1 Competency flow diagram - partial To use BIM competencies in learning, these first need to be clearly defined. This section describes a three-step approach (Figure 1) to identify, classify and aggregate competency items into a BIM competency knowledge base: Competency identification BIM competency items are first collected from multiple sources and then filtered to isolate those that satisfy the aforementioned integrated BIM competency definition. The sources used include: analysing BIM job advertisements; dissecting BIM roles defined within literature and noteworthy BIM publications (Succar, 2013); adapting competency inventories from related domains; and _ harvesting competency requirements from industry associations and subject matter experts. BIM competency identification, classification and aggregation