1. Definition of BIM
An ideal Building Information Model contains all of the data necessary to design, construct, and manage a building throughout its life-cycle. A BIM is also a digital representation of a building, incorporating CAD and database technology. It is much more than "plans and specs".
The fact that a BIM is a centralized and integrated source of information theoretically makes it possible to work more closely with others in near real- time.
Properly implemented, they will reduce time and waste. (And some side effects in enhancing design quality). Building Information Modeling will impact the overall economics of the construction industry. It may well change our role as engineers and designers. It has become more that a "contract document of the future", it is becoming a required deliverable by big owners, including the federal government.
2. BIM changes the paradigm of a "Construction Document"
The introduction of BIM has stimulated new thinking in the "delivery methods". New methods to improve the process are now starting to be employed by architects and developers. Traditionally, construction documents are plans, elevations, details, sections, more sections, flow diagrams, schematics, equipment schedules, and so on.
Traditional methods of design typically require much paper
to be passed around between a lot of players before we get
a complete solution. If not paper, then much email and PDF's
are passed back and forth.
A traditional team versus Design-Bid-Build
A high school, on which I recently worked,done in traditional manner,
had 9 consultants,
a lead architect, 5 "prime" contractors,
and scores of vendors.
This picture is simplistic,
but vaguely similar to the real lines of
power: they ultimately reside with the owner.