This document discusses communication response models and the cognitive processing of marketing communications. It provides an overview of the basic elements of the communication process, including the source, message, channel, receiver, decoding, noise, and response. Several traditional response hierarchy models are examined, including AIDA, the hierarchy of effects model, and the information processing model. The document also discusses alternative response hierarchies and the implications of different models. Finally, it introduces the cognitive response approach for analyzing the thoughts consumers have in response to marketing messages.