Interventions increasing happiness and life satisfaction

This thesis deals with the intervention strategies of positive psychology and how they affect our happiness and life satisfaction. The literary overview of the work defines the concept of happiness and mention the factors contributing towards its level. There are also evidence appropriate to question whether it is even possible to achieve long lasting positive change in the level of happiness. Another part deals already on intervention strategies. I've focused on mapping the working mechanism of these interventions. I mention factors that contribute to their effectiveness. At the end of the theoretical work I mention the critical reflection on researches to verify the effectiveness of intervention strategies and introduce most common pitfalls, typical for this type of studies. Draft of my research project is aimed at verifying the effectiveness of intervention strategy, "Three Good Things.