A 'strange-situation' setting is developed in a lab. After a mother and her young child are playing and interacting with each other as they so often do, the mother suddenly leaves. The observer witnesses the child becoming hysterical and upset, and when the mother returns, the child will not let go of her. The child is said to be

Personality development encompasses the dynamic construction and deconstruction of integrative characteristics that distinguish an individual in terms of interpersonal behavioral traits. Personality development is ever-changing and subject to contextual factors and life-altering experiences. (Source: Wikipedia)