to add to what eng1234 and hutch56 said:
FYI, I-DEAS Artisan Series (IAS) and Master Series (IMS) are/were basically the same software with certain funtionality removed from IAS (notably TDM, access to quite a few higher-end software 'modules' and some complex Surfacing functionality to allow SDRC (originally) to sell it for a lower pricepoint to compete with Inventor, SolidWorks, and SolidEdge (since at that time none of them had real datamanagement of any kind regardless), where those other functions weren't really needed (or could be worked around).
As UGS had purchased SolidEdge from Intergraph b4 they and SDRC were aggregated by EDS, the need for Artisan became the question you referred to, though that whole thing still seems to be shaking out.
For my 2 cents, the 'Team Data Manager' (TDM) in IMS is definitely worth having if you have more than 2-3 people working on the software ON THE SAME PROJECT (and should be an absolute requirement in my mind if you've got more than 5-10), as it is (and has been since I started using it at IMS1.0 Beta) bullet-proof and quite straightforward to use (primarily for data vaulting and version/revision control).
=> If you have a bunch of small projects with little 'sharing' between them then possibly you can get away with Artisan or some combination thereof at the higher seat counts (as all the files are fully compatible UNLESS you do some of the advanced surfacing stuff in IMS and try to read it in IAS, as it just won't let you modify that feature, at least last I knew).
BTW, anyone who tells you this TDM functionality is not important, has obviously never spent the greater part of a day (or week for that matter) trying to track down design data that was created (have prints!) but that was never 'tracked' by a legacy CAD system ;-). Unless of course it's no big deal to recreate the models and assemblies for a 5-sheet E-size drawing, right?
-Ed