 With respect to question (ii), there is an important distinction to be made between two sorts of simplicity principle. Occam’s Razor may be formulated as an epistemic principle: if theory \(T\) is simpler than theory \(T^*\), then it is rational (other things being equal) to believe \(T\) rather than \(T^*\). Or it may be formulated as a methodological principle: if \(T\) is simpler than \(T^*\) then it is rational to adopt \(T\) as one’s working theory for scientific purposes. These two conceptions of Occam’s Razor require different sorts of justification in answer to question (iii).