1. Forer's birth order theory
2. stereotype & other researchers' theory
3. accuracy of the stereotype in terms of my experience.
We always belong to our families after we are born, and we take certain positions there. The position is called 'birth order.' The term means a role that has been given since we were born. It affects personality, and all siblings have different personalities. I think birth order theory--about the relation between birth order and character--is accurate. There are many researchers who study birth order theory. They include Lucille K. Forer, Kevin Leman, Pamela Withers, Sir Francis Galton, Stanley Schachter, Alfred Adler, Robert Zajonc, Toni Falbo, and so on.

