 Revised Conditional Analysis of Ability: \(S\) has the ability at time \(t\) to do \(X\) iff, for some intrinsic property or set of properties \(B\) that \(S\) has at \(t\), for some time \(t'\) after \(t\), if \(S\) chose (decided, intended, or tried) at \(t\) to do \(X\), and \(S\) were to retain \(B\) until \(t'\), \(S\)’s choosing (deciding, intending, or trying) to do \(X\) and \(S\)’s having \(B\) would jointly be an \(S\)-complete cause of \(S\)’s doing \(X\). (Vihvelin 2004, 438) 