DEERFIELD, ILL. — The AIA BIM Protocol Exhibit E202 defines the BIM Levels of Development (LOD) as 100, 200, 300, and 400. According to a recent online poll on www.IPDChannel.net, the majority of respondents are unaware of this document (69%). While many are aware of this document (25%), only a handful of practitioners have used it (5%). Are you aware of this document? Vote here.