Philosophers typically divide knowledge into three categories: personal, procedural, and propositional. It is the last of these, propositional knowledge, that primarily concerns philosophers. However, understanding the connections between the three types of knowledge can be helpful in clearly understanding what is and what is not being analysed by the various theories of knowledge.

Personal Knowledge

The first kind of knowledge is personal knowledge, or knowledge by acquaintance. This is the kind of knowledge that we are claiming to have when we say things like “I know Mozart’s music.”

Prodecural Knowledge

The second kind of knowledge is procedural knowledge, or knowledge how to do something. People who claim to know how to juggle, or how to drive, are not simply claiming that they understand the theory involved in those activities. Rather, they are claiming that actually possess the skills involved, that they are able to do these things.

Propositional Knowledge

The third kind of knowledge, the kind that philosophers care about most, is propositional knowledge, or knowledge of facts. When we say things like “I know that the internal angles of a triangle add up to 180 degress” or “I know that it was you that ate my sandwich”, we are claiming to have propositional knowledge.