Abstract :
We present the logic $textsf{G.STRAT}$ for reasoning about group strategies. To enable a modal semantics for reasoning about group strategies, strategy profiles will be viewed as structured possible worlds. Although the general logic is undecidable and not finitely axiomatizable for systems with 3 agents or more, we identify more well-behaved logics like $textsf{ATL}$, and temporal emph{stit}-logics as fragments. We explain our aim to apply the logics to reasoning about multi-agent programs, such as the programs of 2APL. Finally, we discuss several properties of (multi-)agency expressible in the logic. Among these properties is an axiom characterizing a basic form of autonomy.
