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Firts, I would suggest that BIM is currently a set of federated (related and integrated) information databases generated and maintained over the life cycle of a building. Rarely will one model be capable of accomodating all of the data associated with a building (structural analysis, energy simulation, human behavior simulation, O&M data, etc.). To handle the large file issues mentioned by Milan K, I believe there is a trend among software developers to actually associate object level files linked together so that only small fractions of the entire data file will be accessed at one time in the future to increase process speed and productivity. Second, to Helsinki Dave, if everyone took his approach there would be no incentive to develop this technology further to try and improve the industry. We'd be like the tree that kills the drunk driver, we wouldn't do anything but we'd still kill the technology. The 70's and 80's model of design and construction is not working. Owner's are tiring of RFI's, Change Orders and the like. BIM and an Integrated Design and Construction Process is going to be an Owner driven transformation and those of us who chose not to adapt will be left in the dust.