Parallel Distributed Processing (PDP), or Connectionism, is a frontier cognitive theory that is currently garnering considerable attention from a variety of fields. Briefly summarized herein are the theoretical foundations of the theory, the key elements observed in creating simulation computer programs, examples of its applications, and some comparisons with other models of cognition. A majority of the information is culled from Rumelhart and McClelland\u27s (1986) two volume introduction to the theory, while some concerns from the field and the theorists\u27 accompanying responses are taken from a 1990 article by Hanson and Burr
