An important theory of social psychology, formulated by psychologist Harold Kelly (1967), aims to explain how people interpret the behavior of others by analyzing the available information and determining whether the behavior is the result of a person’s personality (intrinsic cause) or a consequence of the environment or situation (extrinsic cause). The model is based on the principle that potential causes of behavior can be identified by observing the differences between behavior and circumstances over time, in different situations, and in different people. A covariance model can be defined as an analytical framework that allows people to interpret a person’s behavior by comparing different pieces of information, such as differences between people, situations, and over time, to determine the source of an internal or external cause. The model is based on the idea that behavior reflects a combination of personality and situational factors, and that a thorough analysis of the covariance between these factors can reveal the most likely cause. The covariance model demonstrates that the interpretation of human behavior depends on analyzing information from a variety of sources and comparing the behavior of different people, in different situations and over time.A powerful tool for understanding whether behavior is the result of a person’s personality or surrounding circumstances, increasing the accuracy of interpretation and reducing cognitive distortions in social and professional life.