The alternative approach that will be the main focus of this article is the approach that represents belief by a set of probability functions instead of a single probability. So instead of having some \(p\) represent your belief state, you have \(P\), a set of such functions. van Fraassen (1990) calls this your representor, Levi calls it a credal set. I will discuss various ways you might interpret the representor later but for now we can think of it as follows. Your representor is a credal committee: each probability function in it represents the opinions of one member of a committee that, collectively, represents your beliefs.