Final answer:
Walter Mischel suggested that individual behavior is highly influenced by the situation and consistency is found within situations, rather than across different ones. His marshmallow test highlighted self-regulation as a predictor of future success.
Step-by-step explanation:
Walter Mischel suggested that an individual's behavior is not solely dependent on their personality traits, which was the traditional view in personality psychology. His research indicated that behavior is considerably more consistent within specific situations rather than across different situations. One of Mischel's most famous contributions was the marshmallow test, which examined how children's ability to delay gratification (a form of self-regulation) predicted their future success. Additionally, Mischel's perspective emphasized the importance of how individuals process and perceive the situations in which they find themselves, bringing attention to the role of cognitive processes in interpreting the environment.