Concept Captions below each picture make a point. You can select each picture to see it in greater detail. Plans & specs describe the project, written or verbal 2D plans provide a picture, or sketch of the project 3D replicas of the project are easy for all to understand Here 2D electrical conduit layout used for coordinating 3D representation electrical conduits is better Best Models rarely show all the detail needed to build Coordination can easily catch expensive errors & omissions Vendor equipment specs can be used to select correctly Coordination is not always about clash Shop drawing used for coordination Most models fails complex coordinations Select for overview