 McNamara 1996c and Mares &amp; McNamara 1997 provides a semantic and logical framework for distinguishing “must” from “ought”, indifference from optionality, as well as distinctly representing “the least you can do” idiom and analyzing one central sense of “supererogation” via that otherwise unstudied idiom. As a measure of the increased expressive power, the three-fold partition of normative positions for SDL is extended to a twelve-fold partition; with an extension to accommodate praiseworthiness and blameworthiness (McNamara 2011a,b), an eighty-four fold partition results. See McNamara forthcoming for a thorough introduction to this area of research.