Given the large number of books on BIM that have been — and continue to be — published, what makes Understanding BIM stand out is that it is authored by someone who actually developed the precursor to modern BIM applications. This was an application called SONATA and it was developed by Jonathan Ingram — in true Silicon Valley start-up style — in his attic (rather than a garage as it would be in Silicon Valley!) in England. SONATA became REfLEX, which then became ProReflex, which was acquired by PTC (Parametric Technology Corporation), from which Revit emerged as a start-up, which was then acquired by Autodesk — and then of course, as they say, the rest is history. It is fascinating to be able to look back at the origins of BIM from someone who not only had a front row seat to the game, but who actually played it — and not just played it, but actually drafted many of its rules.