 The difficulties involved in this sort of counterexample are clear. The proponent of (CA) will reject the arguments for the incompatibility of ability and determinism as unsound. Indeed, it is precisely her thought that such arguments are unsound that has typically led her to take ability to be analyzed in terms like those of (CA). So global counterexamples, while they may be successful, are dialectically ineffective relative to the range of questions that are at issue in the debates over ability.