A critical review of Stenius' account of the logic of disjunctive permissions, leading to a proposal for a closely related approach in terms of "checklist conditionals".

I am idebted to members of the Wellington Logic Seminar for useful discussions of work of which this essay forms part, in particular to M. J. Cresswell for comments in the earlier stages of the investigation and to R. I. Goldblatt who suggested the definition ofB infD supu and made numerous other suggestions.