Psychics, as with magic-users and other power-wielders, fall into a set of archetypes. This is due to the usefulness that these arrangements have compared to other possible arrangements; in short, both game design as well as logical natural selection trends would result in psychics manifesting along predictable patterns because those are the ones that do best over time within the many and various environments wherein psychics exist.
What will come in the next few weeks will be, as with the magic-users, an exploration of these archetypes. I will not be spending posts on entire Occupations, but rather making mention of them as they relate to the archetype of which they are an expression, so (learning from the magic-user series) I expect that this will be a much shorter series that is nonetheless more comprehensive in its scope and no less useful.
I will not arrange them along the minor-major-master array. They will be arranged in terms of notability. More than that strays into spoiler territory. See you next week.