Computer aided design (2d design) had revoluted the AEC design industry by replacing drawing boards decades ago, however, building information modeling is going to revolute the AEC design industry again by replacing 2d design. Let's use AutoCAD to represent 2d design, while using Revit to represent BIM. Revit is a series of softwares: Revit Architecture, Revit Structure, Revit MEP.

When AEC industry was in drawing board age, it was very hard to complete a set of drawings, especially a set of construction documents, since you had to be very skilled and careful when drawing with pen and ink. Only minor revision could be made by scratching the paper with blades.When AutoCAD drafting takes the place of drawing board, things change! You don't have to be very skilled in hand drawing, which requires years of practice, before you use AutoCAD, and you can make as much revision as you want.

When Revit comes into being, it'll surely revolute AEC industry again. It's born with the BIM (building information modeling) concept. When you're modeling any building with Revit, it seems like you're building the building. All the information you input is all parameters with building information. You can easily drag out quatities of building materials and you can make one-time revision to change plans, elevations, sections, details, schedules at a time! Also, Revit Architecure modeling, Revit Structure modeling and Revit MEP modeling can share one file.

Computer technology really improves the AEC industry in efficiency and accurancy. The available and affordable computer makes AutoCAD available. The more powerful CPU, hard disk and video card with cheaper prices make Revit possible.