I notice that the PIUG space lists to top-level topics that may overlap in the subject they cover: Knowledge Pages and Patent Resources. The example that triggered this for me is the presence of the 'Patent Families' page within 'Patent Resources'. This page might very well fit within the definition of 'Knowledge Pages' as well as in its current location 'Patent Resources'.
For a community driven system like a wiki, it may be necessary to prevent new items being created in the improper location due to the contributor not knowing of the proper location. In case of detection of such potentially overlapping topics, I suggest the to add cross-references to the other pages and a definition what content should be located where, just in case contributors are in doubt.