CAT I/II - ILS, Terrain, Aircraft Equipment, Approach Lights and Crew based minima.
is nothing more than a CAT II
with additional pilot qualifications.
Explaining TERPS is a real pain in that I can't send you to a direct document as the FAA has seen fit not to make all of the publications available to the general public. If you ask a FSDO they may provide you with a copy of the TERPS manual the FAA uses to define approach minima, slopes and system criteria.
There are about 8 components that make up the TERPS standard which enables the Category of ILS approach. For example. CAT I/II only requires ALSF-I approach lights, CAT II
/III is ALSF-2. A simple variation in the airfield altitude changes the dynamics of the approach surface exponentially.
Here's a link where you can get some very basic info on TERPS. The basic document is the 8260, but it's not all there. It's as if they don't want some farmer with a landing strip is goign to go out and trying to get his own CAT III approach or something:
Basic TERPS 8260.3B(Sections not included):
Very Very Basic CAT II