Final answer:
During the 1930s, there was skepticism about the ability of individual differences in personality to predict behavior. However, more recent research has shown that personality assessments like the Big Five factors have substantial components that are biological and genetic.
Step-by-step explanation:
During the 1930s, there was a strong critique of individual differences in personality and their ability to predict behavior. Skeptics argued that assessments of personality traits like friendliness and conscientiousness were poor predictors of behavior. This critique was fueled by the belief that a collection of people with access to the same facts would respond similarly, which was shown to be a fallacy. However, it is important to note that personality assessments have evolved over time, and more recent research has developed the Big Five personality factors, which have been shown to have substantial biological and genetic components.