 More particularly, the project of analysing knowledge is to state conditions that are individually necessary and jointly sufficient for propositional knowledge, thoroughly answering the question, what does it take to know something? By “propositional knowledge”, we mean knowledge of a proposition—for example, if Susan knows that Alyssa is a musician, she has knowledge of the proposition that Alyssa is a musician. Propositional knowledge should be distinguished from knowledge of “acquaintance”, as obtains when Susan knows Alyssa. The relation between propositional knowledge and the knowledge at issue in other “knowledge” locutions in English, such as knowledge-where (“Susan knows where she is”) and especially knowledge-how (“Susan knows how to ride a bicycle”) is subject to some debate (see Stanley 2011 and his opponents discussed therein).