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Add USACE BIM Roadmap to TOC Section 7 - References, following US National CAD Standard.

You used the term 'layer cake' although I understand this term it is not depicted in the graphic Figure 1.2-2. What I mean is that on the previous page you describe a Lifecycle Helix and the graphic and words merge together to draw a picture in the readers mind. THere really is a helix in the picture. In this spot however I don't see anything resembling chocolate cake.

The title of this section "Discussion - Different Strokes for Different Folks" If I were teaching this or explaining it to someone this would be a great title. However in a national standard does anyone else believe this may be too cheaky?

You state "This document is Part 1 of the first version of the standard" I question the the words "first version" wouldn't this have to be updated everytime you updated any part of the document as a whole? Suggest striking these 2 words.

What do the words "..or we will only add work." mean? Suggest striking them and letting the rest of the sentence carry the meaning.

I am not warm and fuzzy with the words "stovepipes" and "cylinders".  It makes a cute mental picture but do we really want that in a National Standard?

Does the sentence work anyway? "..there is little transfer of information between.." between what and what? Wouldn't it be better to make the "what" and "what" more clearer?

A general comment:

I understand, that NBIMS is the national BIM-Standard of the United States of America and it is likely, that also other nations will specify their own BIM standards. International software vendors, developing BIM applications for more than one country would appreciate, if the national BIM standards could be consolidated into an international standard, as far as possible.

In different sections the document mentions various organisations which could/should coordinate MVD, IDM and conformance testing related work on the international level. The contributions of these organisations are extremly valuable and welcome, like the NBIMS, but international coodination has to be done by an acknowledged international organisation, which is IAI. The bodies of IAI have to fulfill this task, and in case appropriate bodies are missing, IAI has to be prompted to install them.

Therefore the naming of the different parts of the standard should reflect, what is considered to be national and what international. Particularly IFC, IDM and MVD should only be used to describe parts of the international standard and IAI-International has to guarantee the coordination of it. Any local derivations or contributions, like the NBIMS, should clearly be labled as such. Any local standards cannot become the international standard, as such, but only can contribute and IAI-International has to work these contributions into the international standard. Especially form the viewpoint of a software developer, it is essential that any differences between the international and local standard would be clearly pointed out.

Also for the conformance testing of compliant software applications it must be made clear, what is a national test and what an international. IAI-International is responsable for international conformance tests and certifications, nations might be interested to establish local tests and to provide their own certificates.

Rasso Steinmann, IAI-International ISG-Coordinator, http://isg.buildingsmart.com

There seems to be a tendency to over-expand the scope or definition of BIM. It is like using Google Earth to view BIM. We are zoomed too far out. As a National Standard, we should clearly define the scope of BIM, at least as described in this Standard. The "B" in BIM is for building, not campus or world information model. While multiple models may be used by an agency, company or service, we should keep the Standard focused on the Building Information Model. Each model or data structure does have a world component which locks it in place and a time component.

Carl Matthews, AIA, Page Southerland Page, Houston, TX