The best is to take an examble....
suppose we have
I would like Mister A manage the Category A but not Category B an Category C
Mister B able to manage Category B but not B and C
and so on
And the last but not the least why not Mister D with the grant for Category A, B and D but not C
To day we have two link menus manage table and list table with list table it's quite easy to authorize mister A to read a category or a single table, but with manage table it's a yes or no feature for the whole set of categories and tables.
I hope it's clear for everybody because I'm french and my english is not that good.