Our objective in this project is to create a new measurement of self-esteem development trajectory. We want to explore the moderator effect of chronological age on how multiple selves and social comparison are associated with outcomes such as global self- worth and positive affect. We will investigate how affective maturity and development impact these relationships. To do so, we will include a sample of the medically ill, as serious medical conditions have been identified as major disruptors of social development and affective maturity. We will also investigate the moderating role of optimal parenting on the link between experiencing medical illness and child mental health and self-esteem. Finally, we will explore the relation between self-esteem component and the development of metacognitive abilities. We will administrate questionnaires and neuropsychological tasks to non pathologic and epileptic children aged between 8 and 14.