Reasoning about Information Change Jelle Gerbrandy, Willem Groeneveld Abstract: Recently the notions of information and information change have gained a prominent place in several fields of scientific research, such as philosophy, the formal semantics of natural language and computer science. The present paper highlights two of such developments, namely the update semantics of Veltman (1996), and the analysis of communication in distributed systems, in particular the approach of Fagin et al. (1995). Our main goal here is to show that tools of the former may provide useful supplements to the approach of the latter.