Table 2.

Institution-based PP interventions evaluated in randomized-controlled trials

Positive Psychology (PP) intervention	Psychological well-being and other psychosocial outcomes effectively changed	Example references
Workplace
Goal setting and planning	Positive affect (↑), flourishing (↑)	A24
School
Gratitude	Positive affect (↑)	A25
Acts of kindness	Positive affect (↑), engagement (↑)	A25
Multicomponent PP interventions (e.g., acts of kindness, gratitude for positive events, mindfulness; PP interventions are often combined with some strategies from cognitive-behavioral therapy or acceptance and commitment therapy)	Psychological well-being (↑), flourishing (↑), personal growth (↑), optimism (↑), anxiety symptoms (↓) , depression symptoms (↓)	A26-A28

Note. ↑= increase; ↓=decrease