According to Jung, our psyche produces energy that can be channeled externally or internally. When a person channels energy externally, towards the outside world, Jung says that person is an extrovert. When that energy is channeled internally, towards one's emotions and ideas, that person is introverted. Jung also organized four functions of personality: perception, intuition, thinking and feeling. His idea evoked new ideas of personality tests. Katharine and Isabel Myers, mother and daughter, used Jung's personality theory to create the famous personality assessment, The Myers-Briggs Type Indicator. The only part that many cannot accept is the idea of ​​the collective unconscious proposed by Jung. He believed that each of us has a folder of memories that contain the human past. Everyone has similar life experiences, and these universal experiences are passed on to the next generation. The idea that we are all connected by experiences in human history is difficult to endorse, just as reincarnation is difficult to accept. Adler's theory concerns humans as individuals; we are all a unique mix of traits, motivations, interests and values. He believed that we were neither bad nor good, just that we chose situations. Adler says we are in control of our outcomes in life; this is his contribution. Another of Adler's contributions is his lifestyle theory. There is a unique character structure that each of us possesses that helps us strive for our ultimate goal. A flaw in Adler's theory was its lack of biological influence on personality. He mainly focused on the social aspect of individuals’