Final answer:
B. F. Skinner, a strict behaviorist, focused on environmental influences rather than individual traits for development, thus the statement is false.
Step-by-step explanation:
Behaviorist B. F. Skinner did not believe that the individual's personality traits are inborn. Instead, he viewed personality as significantly shaped by the environment – through the reinforcements and punishments one experiences. Skinner's focus was on how behavior is affected by its consequences, emphasizing environmental factors rather than the individual's traits or the cognitive processes as being the most important for development. Therefore, the statement that 'Skinner believed that the individual was most important for development' is false.
Skinner argued that personality develops throughout our entire life and is not fixed during childhood, contending that our responses and behaviors can change with new situations. Skinner's theory of operant conditioning and the concept of reinforced behavior is a cornerstone of behaviorist psychology.