Pretty sure there's no way of doing that without really messing things up. What sort of changes would they be making? Would server work instead?
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Short answer: you can't.
Longer answer: twb files are generated XML which is notoriously difficult to merge - effectively impossible - so I wouldn't even consider this. Instead coordinate and pass it around, or use centralised, shared datasoources and work on multiple workbooks.
You really ought to use version control (Subversion is the easiest to get going, run through Simple SVN Document: Getting Started with SVN Client and Get up and running with TortoiseSVN and Subversion in 15 minutes. | Blog@Surfulater) and then you can coordinate shared datasources and get control and tracking of all work on the twb files themselves.
I recommend putting your whole tableau repository under version control (set it to ignore the logs and any tmp files). Probably have it ignore tde files too ("generated binary files should not be in version control"), but I've found in lieu of Shared Datasources from Server (the best way to solve this), having the extracts in a separate SVN repo is an alright solution. Keep them separate to the twb files because they consume stacks of space and you don't really need to backup the repo for them.
Great answer Nathaniel.
Thanks for the great response
This thread is old but has there been progress made in this regard? I currently work primarily with Tableau Desktop but we're looking to purchasing a few more licenses (possibly upgrading to Tableau Server). Currently any changes (fonts, coloring, design, etc.) that need to be made have to be made with my personal Tableau Desktop. I'd love the chance to divide up the workload (i.e., I work on building the vizzes and a colleague can help with branding), but I'm not seeing a simple solution and based on this thread, I'm not sure there even is a good solution.
Does Tableau Server make this type of collaboration easier/better? Seems like this would be a logical product feature but apparently not. I would love to hear if anything has changed since 2013... Thanks in advance!