We first summarize and comment upon a 'calculus of intrinsic preferability' which we have presented in detail elsewhere. 1 Then we set forth 'the problem of supererogation' - a problem which, according to some, has presented difficulties for deontic logic. And, finally, we propose a moral or deontic interpretation of the calculus of intrinsic preferability which, we believe, enables us to solve the problem of supererogation.