 Goal dynamics and intentions While preferences and goals have so far been assumed fixed and universally known, this is by no means necessary. van Otterloo (2005) presents a dynamic logic of strategic powers, where information about players’ intentions and preferences can be announced during play. Roy (2008) uses announcements of intentions to obtain simplified solution procedures for strategic games. More concrete scenarios of extraneous information flow are found in Parikh, Taşdemı̇r, and Witzel (2013), where agents manipulate the knowledge of others during play.