L. David Ritchie proposes that communication creates relationships between what is perceived or known by one person and what is perceived or known by others; the form of the communication will be determined in part by whether there are pre-existing relationships between the communicator and the audience. The receiver and originator of a message must work from some common understanding of what sorts of patterns are used to communicate and how these patterns are related to other events. Communication has to do with community both in the sense that it relies on having something in common in the first place and in the sense that it can influence what the communicants subsequently have in common.