In the social and behavioral sciences, the subjective nature of the behavioral flexibility that an individual can display in situations has raised concerns regarding the stability or replication of obtained evidence about personal concepts, such as personality, social interaction, psychological well-being, and learning. The concerns apply specifically to the measurement and data analysis of individual behavioral flexibility in situations. In this theoretical article, the subjective nature of individual behavioral flexibility is considered by focusing on what happens before the behavior appears by including the situation via the decision-making process of maintaining behavioral balance in line with oneself. The aim of this article is to place in the forefront and clarify the major questions that arise in studying the process of behavioral decision-making of the person in the situation. More specifically, the focus is on discovering and clarifying if the individual interpretation of a continuing situation can be limited to certain features of personal characteristics in relation to certain situational components that together can explain the maintaining of behavioral balance. A schematic presentation of the behavioral decision-making process is proposed and discussed for the purpose of conducting person-situation research studies.