This critical study concentrates on action-theoretical aspects of the Davidsonian philosophy of social science given in Macdonald/pettit 1981. It questions the relevance to social science of developing Davidson’s semantic “principle of charity” into a “principle of humanity”, discusses specific formulations of assumptions of behavioural and attitudinal rationality in the explanation of action, and joins issue with the causal account given of the latter suggesting that its metaphysical motivation is of no concern to social science.