“Weiss (2013) defines four classes of agents:

Logic-based agents – in which the decision about what action to perform is made via logical deduction;

Reactive agents – in which decision making is implemented in some form of direct mapping from situation to action;

Belief-desire-intention agents – in which decision making depends upon the manipulation of data structures representing the beliefs, desires, and intentions of the agent; and finally,

Layered architectures – in which decision making is realized via various software layers, each of which is more or less explicitly reasoning about the environment at different levels of abstraction.”