  In the simplest version, the model is constructed as follows: We imagine that there are two states of affairs \(T\), two acts \(A\), and two signals \(M\). Players have an equal chance of being in either the position of sender, or receiver. Receivers must decide what to do based purely on what the sender tells them. In this purely cooperative version, each player gets one point if the receiver does \(A_1\) if the state is \(T_1\) or \(A_2\) if the state is \(T_2\).