From Thought Police Interactive Fiction

Expertise represents the hobbies, career path and/or post-secondary education and training of a character. They will generally be the main source of in-depth knowledge and intricate skills.

Expertises have both a class and a rating (or level). The class of a career represents the complexity and amount of training typically involved in the career. The rating (or level) of a career represents the amount of training, experience and skill possessed by a character.

Class

1 – Relatively simple careers; hobbies; amateur skills	Examples: Administrative assistant, driver, customer service, radio operator
2 – The average “professional” or “skilled trade” career	Examples: Manager, accountant, electrician, engineer
3 – Extremely intricate or complex careers	Examples: Doctor, academic, executive

Rating

1 – The most basic training available in the field

3 – The average skilled and well-trained professional

5 – The height of human capacity; Nobel-prize winners

6+ - Superhuman

Specializations

Specializations can help better define a character's career path(s) and skill. They do not limit an expertise, but rather indicate specialist knowledge and skill within the profession beyond the normal level of competence. The maximum number of specialties that can be gained is the same as the class of the career (not the rating), so a class two expertise can have up to two specializations.