Final answer:
The theory with limitations related to defining stages for complex behaviors is the developmental 'stage' theory in family sociology, which has been criticized for its rigidity and failure to account for the diverse nature of family life.
Step-by-step explanation:
The theory in question is likely related to developmental 'stage' theories used in family sociology, which have been criticized for not accounting properly for the complex and variable nature of family life. These theories once suggested that families go through a series of predictable stages. However, this approach failed to capture the diversity of family forms, and the stages are difficult to define for complex behaviors that are not dichotomous, meaning strictly divided into two parts. Modern perspectives on family development tend to embrace more fluid models that better reflect the variability in family structures, sequences of life events, and cultural differences.