Past research has established clear behavioral differences between Type A and Type B individuals. The manner in which these behavioral differences are represented in the self-definitions of Type As and Bs was examined in a group of 42 college students. The existence of Type A and B self-schemata was investigated using two tasks designed to measure the influence of these hypothetical structures on speed of processing and memory interference. During an initial task, Type As and Bs made self-relevant decisions (Like Me, Not Like Me) in response to trait adjectives previously scaled as Type A, Type B, or neutral in content. Reaction times for the decisions were measured and results indicated that both Type As and Bs made faster decisions for schema-compatible responses than for schema-incompatible responses. On a second task, Type As and Bs were tested for recognition memory after attempting to memorize half of the aforementioned trait list. Memory errors were examined and indicated that Type As and Bs made more errors compatible with their respective self-schemata. These results indicate that a Type A and B distinction forms a reliable organizing framework for the self-definitions of Type As and Bs. (Author/NRB)