Forget About Layers and X-References

If you’ve already made the jump into Revit, then this will already be obvious: Rather than user-
defined layers, you use an intelligent architectural classification system to manage visibility, graphics,
and selection. This may seem stringent at first, but once you get the hang of it, you’ll see the benefits. Because a building model is an assembly of meaningful, to-be-built objects, you control the visibility and graphics of those objects using a rational list of well-understood categories. This also
makes it easy to select similar elements and edit them. Figure 1.8 shows the list of classifications
that manage visibility. You can’t add to or alter this list, which means every project enjoys the same
level of visual predictability. And of course, with an integrated model, you don’t need to worry
about referencing other drawings to keep the drawings up to date and in sync.