This paper outlines several properties of internal representational models (IRMs) and offers terminology that may help to differentiate the models. Properties of IRMs include focus, memory systems, content, cognitive function, "metastructure," quality of attachment, behavioral strategies, and attitude toward attachment. An IRM focuses on the person whose attachment behavior is described by the model. Memory systems, such as procedural, semantic, and episodic memory, contain different types of encoded and retrieved information relevant to attachment. The content of an IRM consists of what the individual knows about a particular relationship. IRMs help individuals interpret the meaning of others' behavior and make predictions about others' behavior. IRMs can facilitate the organization of a response. "Metastructure" refers to the cognitive organization of the IRMs of two or more attachment relationships. Quality of attachment refers to individuals' expectations of their attachment figures and of themselves based on experiences with the attachment partner. Behavioral strategies are individuals' typical behavioral responses to attachment figures. Directions for further study are suggested. Nearly 50 references are cited. (RH)