 Given the co-existence of qualitative and quantitative perspectives, it makes sense to ask whether one can track the other. In a static sense, tracking asks whether different notions of belief can be translated into each other by omitting or transforming some of the semantic details involved. A dynamic interpretation expands on this by asking whether updating, either in the hard or soft varieties of  Section 4,  is compatible with these translations in a commutative diagram: Information update in a new perspective after translation should yield same result as first performing a matching update in the old perspective and then translating (van Benthem 2016). In games, the topic of tracking may refer not just to information update, but also to solution concepts or moves in game play described at the various levels considered in  Section 2.