1. A method for predicting the functional availability of a vehicle having a plurality of subsystems, comprising: generating, by each of the plurality of subsystems, a plurality of binary values corresponding to the functional availability of the respective subsystem; converting, by a plurality of prognostic generation modules each coupled to one of the plurality of subsystems, parameters for their respective subsystem from the plurality of binary values to a plurality of prognostic vectors, each corresponding to one of the plurality of subsystems; converting, by an availability prediction module, at least a portion of a Boolean availability expression into an equivalent fuzzy output expression, the fuzzy output expression operable on the plurality of prognostic vectors; and predicting, by the availability prediction module, the functional availability of the vehicle based upon the plurality of prognostic vectors and the fuzzy output expression.