Nearly 75% of architectural, engineering and contracting firms now use BIM, according to McGraw-Hill Construction. That's up from only 28% in 2007. While the number of people with five or more years experience with BIM has increased, the number of those with just one or two years experience has declined. Even though most firms see a positive return on investment with BIM, the fact that fewer young people have experience with it "may affect the industry for years to come," writes Tom Sawyer.

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