In information theory, specific-information is the generic name given to the family of state-dependent measures that in expectation converge to the mutual information. There are currently three known varieties of specific information usually denoted ${\displaystyle I_{V))$, ${\displaystyle I_{S))$, and ${\displaystyle I_{ssi))$. The specific-information between a random variable ${\displaystyle X}$ and a state ${\displaystyle Y=y}$ is written as :${\displaystyle I(X;Y=y)}$.