The document discusses two models for explaining human behavior: the S-R (stimulus-response) model and the S-O-B-A model. The S-R model views behavior as a direct response to external stimuli in the environment. However, it does not account for internal feelings and the role of the individual. The S-O-B-A model is more comprehensive, including stimuli (S), the organism/individual (O), behavior (B), and accomplishments/consequences (A). It views behavior as influenced by the interaction between external stimuli and internal processes of the individual. The individual plays an active role as a mediator between stimuli and response, unlike in the passive S-R model.