Starting with a broad use of the term, this chapter examines different types of decision-making and agents. A typology is proposed that can help to avoid confusion and promote understanding, especially in discussions between different scientific disciplines. The typology includes reporting/non-reporting agents, fully/partially transparent agents, and observer-/self-transparent agents. However, the most profound distinction turns out to be between non-discursive and discursive agents. This is mainly because discursivity and responsibility are closely linked. Discursive agents therefore have a special position: they must decide how they deal with other types of agents and what they use them for and how they use them in their own decision-making. So far, only humans can be considered as discursive agents.