A strength is its ability to explain human behaviour- though it is controversial, it has had a huge influence on psychology and contemporary thought. Alongside behaviourism, the approach remained a key force in psychology for the first half of the 20th century and has been used to explain a wide range of phenomena (like personality development, origins of psychological disorders, moral development, and gender identity). Its significant in drawing attention to the connection between childhood experiences and our later development. It has then had a positive impact.