P. distinguishes four types of pragmatic regularities, which are defined in terms of the parameters surface/deep, arbitrary/universal and constitutive/determining: distributive pragmatic rules, implicative pragmatic rules, conditions of satisfaction, and principles of pragmatic deduction. He concentrates on the principles of pragmatic deduction and divides them into the principles of manifestation, generativity, veracity, reciprocity, coordination, cooperation, rationality, charity and humanity.