Inclusion Criteria:  The inclusion criteria for the school staff (teachers, head teachers) are: they must be in the recruited study schools and teaching in Pre-Primary to Primary 4 classrooms or holding the head teachers/administration leadership position in school. The inclusion criteria for Parent Leaders are: they must be at least 18 years old and have served as a Parent-Teacher-Association member or Parent Leader in the school for at least 1 year. The inclusion criteria for the PD program implementers are: they must have current employment with eligible partners (i.e., medical/mental health institutions, Teacher Training Colleges), with professional experiences in teacher training or mental health training. The inclusion criteria for parents are: caregivers must be at least 18 years old, their children must be enrolled in Pre-Primary or Primary 1 to 4 classes (or between 3 to 10 years old) in the recruited schools, and willing to have their child to be assessed by research staff. Parents and children will have diverse characteristics (e.g., randomly selected from school student lists). About 5% families will be randomly selected from the student lists. The proposed study will be open to both men and women caregivers.  Exclusion Criteria:  • Evidence of psychopathology or cognitive impairment severe enough to preclude giving consent, or completing the survey instruments or the focus group of the study.