Waters says that a key tenet of positive psychology is the 'skills and mindsets that promote positive emotions, positive relationships, resilience, and character strengths' can be taught in schools.  Three criteria had to be met for the school to be included in the study (1) approach had to build positive factors not just focus on reducing negative outcomes, (2) intervention had to occur at school and (3) reliable and valid research designs used to evaluate.  

The positive psychology approach had to include interventions that promoted hope, gratitude, serenity, resilience and character strengths.  To teach gratitude students were asked to complete a journal for two weeks and asked to write down 5 things that were grateful for daily.  Students reported feeling improvements in gratitde, life satisfaction and optimism.

Results indicate that positive psychology is significantly related to student wellbeing and academic performance.  Waters concludes that whole school approaches are required to ensure the positive psychology message is embedded across many curriculum areas, year levels and all staff.

From: Waters, L. (2011). A review of school-based positive psychology interventions.   The Australian Educational and Developmental Psychologist, 28(2), 75-90.