The document discusses how six personality theories - psychodynamic, behaviorism, humanism, biological, traits, and social cognitive - can help explain the different reactions of Ali, Shawn, and Peter to seeing a snake in a garden. Ali panicked, Shawn played with the snake, and Peter killed it. Each theory offers explanations for their behaviors, such as psychodynamic theories pointing to past experiences, behaviorsit theories to learned responses, and biological theories to inherited traits. The document concludes by saying an integrated approach using all six theories can help interpret human differences more comprehensively.