I just became aware of an issue that I wanted to pass on to you all right away.  Workset1 is special.  It should never be renamed, because it can lead to fairly serious problems down the track, including the This action has caused deletion of non-editable workset: issue.

So you should make it part of your Revit standard that no one can rename Workset1 – ever.

As usual, this is something that Steve already knew, and already told us.  Thanks Steve!

One other habit I have is to never rename Workset 1 because Revit won’t let us delete it. It’s the “original” workset and Revit just doesn’t let us delete it.
via
Revit OpEd: Delete a Workset’s Contents?

An old discussion on AUGI also touches on the issue:

sweiser
2009-04-16, 12:27 PM
I just followed Shruti’s instructions and got the same error. For me it says I am deleting “non-editable Workset ‘Workset1’ ” Any other ideas?

via
http://forums.augi.com/archive/index.php/t-84855.html

If you want to find out the actual file size of families that are living in your project, follow these steps:

  1. In Revit 2012, export all families to RFA files (File – Save As – Library – Family – ). 
    In 2011, you might be interested in this method.
  2. View the exported folder in Windows Explorer.
  3. Sort By – Size
  4. You will see the most bloated families at the top.

Here is an example:

To reduce the size of the largest families, I can now:

  1. Open them from the project
  2. Delete any unnecessary data (such as imported DWGs)
  3. Purge and then 
  4. Reload them into the project.

I anticipate significant size decreases for my (currently) 547 mb project!

Sometimes Central Files can become large and unwieldy.  Imaginit have put together a step-by-step process for cleaning up and maintaining your Central Files.  You wouldn’t do all these steps every day (more like every 6 months maybe), but this post is a good reference point for the key steps that are required to keep things running smoothly.

1. Have all users synchronize and save to central, make sure all worksets are relinquished, close the local files

2. Have one user Open the Central file. From the Open dialog box, clear the check box Create New Local, place a check in the boxes for Detach from Central and Audit (you will see a warning like below)CF #2

Read more at
Revit Central File Maintenance – IMAGINiT Technologies Support Blog