Answer: 
Behaviorists, Self-esteem 
Explanation: 
Behavior approach: 
This concept is based on explaining behavior through observation. Behaviorists assume that they can observe people by their behavior. Behavior can be observed when a stimuli respond. For example, we asked a person to hold a book, and he responds in holding the book. Even behaviorists believe that we just like a blank slate or tabula rasa and we all same at birth. 
Self-Esteem: 
Self-esteem is related to confidence. it is related to achievement, good relationship, etc. It is a highly positive factor in life. The person who has high self-esteem, high optimistic level towards life. Low self-esteem leads to depression.