The acronym BIM may represent (inter alia) Building Information Modelling, Building Information Model, and Building Information Management. While all three are related, they have different meanings. Building Information Management is about methodologies for managing the production, distribution and quality of construction information for efficiency and collaboration. Acronym BIM has rarely been assigned for Building Information Management in contemporary discourse (probably due to possible confusion). Building Information Model is the product of modelling, and they are often referred to as BIM Models. Thus, it is clear that the consensus is that BIM means Building Information Modelling. This video by Graphisoft is a good explanation on BIM (view it in full screen) given in layman's terms.