Various ways that the components of an rational agent can represent the environment that the agent inhabits:

a$)$ Atomic, Non$-$Atomic, Structured and Non$-$structured

b$)$ Atomic, Factored and Structured

c$)$ Robust, Persistent, Factored and Structured

d$)$ Durability, Consistency, Atomic and Factored

e$)$ atomicity, consistency, isolation, and durability