After spending some time working on ONS categories, mostly a matter of standardising or rationalising category names, I was struck by the lack of space pages and/or links to them.
a) Every ONS should surely have a space page where all the details of the study are made available. Perhaps we could call them the Home Page?
b) Those details do not belong on category pages.
c) Every category should then have at the top a link to the Home Page e.g.
[[Space:XXXX Name Study|The XXXX Name Study Home Page]]
d) At the same time The Home Page should not have links to the categories e.g. [[Category: Yorkshire, XXXX Name Study]] because that means the Home Page appears right at the bottom of the category amongst the profiles.
e) If the Home Page has links to a variety of categories that exist, they should take the form:
[
https://www.wikitree.com/wiki/Category:County, XXXX Name Study The County XXXX Name Study Category''']
which just opens the correct category.
I believe the underlying principle of a space page fits the ONS guidelines. Perhaps they might be extended to encourage the use.