You concepts are correct.
Here is some info from my talk at the Revit Technology Conference 2007:
- In Revit 2008 Groups and links are now interchangeable. They can be bound or saved out at any time making this decision a little less critical. The following outlines some of the benefits and limitations of both:
1. Can be tagged and quickly manipulated in the host file.
2. Can interact (to an extent) with surrounding geometry not part of the group.
3. Can exclude elements from specific instances of a group.
1. Better for file size as all information is stored in the other file.
2. Tags have to be applied in the other file and the view linked across (not possible for sections & elevations)
3. Somewhat more reliable as they do not need to interact with elements in the host file.
Generally with large files (large is very ambiguous BTW).
So you links are going to be quicker to move and change, but more difficult to co-ordinate changes...
Once you go to DD/CD stage how you document will greatly depend on whether you use groups or links. I try to keep 1 site file, 1 file for each building and the units as groups (which can be saved out and used in other files also).
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