"Maturity Level Definitions 0. Unmanaged CAD probably 2D, with paper (or electronic paper) as the most likely data exchange mechanism. 1. Managed CAD in 2 or 3D format using BS 1192:2007 with a collaboration tool providing a common data environment, possibly some standard data structures and formats. Commercial data managed by standalone finance and cost management packages with no integration. 2. Managed 3D environment held in separate discipline BIM tools with attached data. Commercial data managed by an ERP. Integration on the basis of proprietary interfaces or bespoke middleware could be regarded as pBIM (proprietary). The approach may utilise 4D Programme data and 5D cost elements. 3. Fully open process and data integration enabled by IFC / IFD. Managed by a collaborative model server. Could be regarded as iBIM or integrated BIM potentially employing concurrent engineering processes."