![initiate of the sevenfold veil initiate of the sevenfold veil](https://static.wikia.nocookie.net/callofduty/images/b/b5/Judgment_Day_Menu_BOII.png)
The goal is merely to make it clear that an "up two" is better than an "up one", and that both are only in reference to the starting point as given by the "logical entry". There will also be classes that go off the top or bottom of the scale. A Tier 3 with an "up one" PrC wouldn't necessarily be a Tier 2, and a Tier 1 with a "down two" PrC would probably still be better than most Tier 3 classes. So for this, I'll be referring to Tiers and how the PrC changes them, but I'm aware that there's multiple Tier systems out there that differ in substantial ways, and that some of these gradings will put classes into places they just don't belong when taken literally. In other words, a PrC for Soulknives is held to a different standard than a PrC for Sorcerers, and the grade tells you how strongly you should consider taking that PrC, assuming you're already working on a build that could qualify. Instead, it would make more sense to rate PrCs by how much advantage they give, over their "logical entries". Still, ranking them that way is merely repeating the obvious, that some base classes are better than other, down through the list of PrCs ad nauseum. Soulbow certainly adds more to Soulknives than Mindbender does to Sorcerers, but I think most will agree that a high level Mindbender will still beat a Soulbow with both arms tied behind its back. We should only list a PrC multiple times if the multiple entries are all simple and straightforward given the requirements, as anything else falls under the individual's optimization skill. Where the difference between two "logical entries" is huge, those entries can be listed separately (see Rainbow Servant), but just like for base classes, a single PrC can go up or down based on optimization skill, and we should focus on what we see as the "average" use. It's obvious that some provide too much and some provide too little, but which is which depends on a lot of factors - base class entry being the most obvious.