Focusing thereafter on research, observation and treatment of children, Anna Freud established a group of prominent child developmental analysts (which included Erik Erikson, Edith Jacobson and Margaret Mahler) who noticed that children's symptoms were ultimately analogue to personality disorders among adults and thus often related to developmental stages. Her book "Normality and Pathology in Childhood" (1965) summarised 'the use of developmental lines charting theoretical normal growth "from dependency to emotional self-reliance"'. Through these then revolutionary ideas Anna provided us with a comprehensive developmental theory and the concept of developmental lines, which combined her father's important drive model with more recent object relations theories emphasizing the importance of parents in child development processes.