the process of classifying or being classified

categorization

a system of naming

vocabulary

the careful way in which things are placed in relation to one another; a request to supply goods; a written instruction (especially to a bank or post office) to pay money, or giving authority

arrangement, organization

an official rule or order

managing, organizing

an arrangement; ordered system; a plan or design (for work or activity)

course of action

(an explanation of) the general principles of an art or science; a reasoned account offered to explain facts or events; an opinion or idea that is not necessary based on known facts or reasoning

hypothesis, belief