• The tool's target population has changed.
• It proved impossible to recruit 16 individuals from the original target population, despite the initial commitment of expert centres.

The Lost Children Society (LCS) is a Therapeutic TableTop Role-Playing Game specifically developed for early-onset schizophrenia patient.

It is performed online via a secure teleconsultation and videoconference platform.

Patients are connected from their home, on their personal computer or tablet, equipped with headsets with microphone.

This study aims to validate the feasibility of this online Therapeutic TableTop Role Playing Game.

Inclusion Criteria:

• Diagnosis of early onset schizophrenia
• Patient who has the capacity to understand the protocol and to perform evaluations
• Written informed consent to participate in the study given by the patient or by the parental authority of the minor patient.
• Patient with social security coverage

Exclusion Criteria:

• Intelligence quotient<70 on Wechsler Adults Intelligence Scale-IV (for 17+ years) or the Wechsler Intelligence Scale for Children V (for 15-16 years).
• Personal history of head trauma, neurological disorder, genetic disease.
• Co-morbidities: major depressive episode or post-traumatic stress disorder unresolved or resolved within the last 6 months.
• Lack of mastery or access to a computer or personal tablet in autonomy
• Therapeutic history of metacognitive training.
• Patient under guardianship, curators or legal protection
• Patient going through a period of exacerbation of positive or negative psychotic signs likely to lead to a full-time hospitalization in a specialized environment within the next 3 months