Abstract

The paper is devoted to Janusz Czelakowski’s contributions to action theory and deontic logic. Various approaches to formal action theory are listed and some of them, including Maria Nowakowska’s theory, propositional dynamic logic (PDL) and sees to it that (STIT) logic, are briefly introduced. Logic of performability and deontic action logic with a goal-oriented obligation are recognized as the main contributions of Czelakowski to the field. The essentials of both theories are presented and commented. Their relation to STIT and PDL is outlined.