Regardless of architecture, all IT administrators will want a wiki that allows them to analyze how much server space it occupies and tracks usage. If the wiki catches on like wildfire, for instance, and many people start using it, they need to make sure they can give it enough server power on the back-end.

4. Plan for Mistakes

As people use a wiki, accidents can happen. For instance, most wikis enable people to edit the document at the same time, but due to technical glitches, when the first person hits save, her edits get saved while the second person's get lost.

That's a very specific problem, but Yehuda says it's one you should ask a prospective vendor. Their wiki must track all the changes that occur to a wiki and have a way to revert back to a previous version to find valuable edits that accidently get lost in the saving process. The happiness of your users - who ultimately drive the success or failure of a wiki since it's a tool that harbors collective intelligence - depends on it.

"There's nothing more frustrating than donating content into a wiki and finding out it got lost because someone else was editing at the same time," he says.