Several factors have been identified that can influence the effectiveness of PPIs on wellbeing and depressive symptoms, which include: 
- Depression status
- Self-selection
- Age of participants 
- Format of treatment 

Several factors that can impact the effectiveness of Positive Psychology Interventions (PPIs) 

Based on a meta-analysis that investigated a number of studies utilizing PPIs with their participants, the combined results of several studies revealed that PPIs can significantly enhance one's wellbeing and are effective for treating depressive symptoms. Moreover, the effect sizes of the combined studies were medium-sized, signifying that PPIs work well. 

University of Illinois at Chicago

A set of instructions, activities, and strategies that aim to uplift one's wellbeing, boost positive feelings, cognitions, and behaviors. PPI's typically focus on savoring, gratitude, promoting positive interpersonal relationships, kindness, and pursuing hope and meaning. 

Positive Psychology Interventions (PPIs)

Sin, N.L. and Lyubomirsky, S. (2009), Enhancing well-being and alleviating depressive symptoms with positive psychology interventions: a practice-friendly meta-analysis. J. Clin. Psychol., 65: 467-487. https://doi.org/10.1002/jclp.20593

Enhancing well-being and alleviating depressive symptoms with positive psychology interventions: a practice-friendly meta-analysis

Despite individuals receiving successful treatments of psychopathology, low levels of wellbeing may linger in individuals, which can become a significant risk factor for more psychological distress. Incorporating PPIs into one's treatment can be greatly beneficial as it acts as a buffer against psychological symptomatology, as well as turn these strategies into positive daily habits and preventing future relapse for formerly depressed individuals.

PPIs are needed even after successful treatments of psychopathology

Eudaimonic happiness refers to well-being that focuses on meaning, purpose, and self-realization (i.e., "I feel that life is very rewarding"). Hedonic happiness refers to well-being in terms of attaining pleasure and avoiding pain (i.e., "I often experience joy and elation"). A number of emotional outcomes of PPIs fall into both eudaimonic and hedonic categories. 

Eudaimonic vs. Hedonic Happiness 

Effectiveness of Positive Psychology Interventions on wellbeing and depression symptomatology 

In addition to learning how to cope with negatives, positive psychology intervention strategies are utilized in order to increase wellbeing and benefit from appreciating and attending to life's positive attributes. PPI strategies include but are not limited to writing gratitude letters, practicing optimistic thinking, revisiting positive experiences/situations, engaging in enjoyable activities, and socializing. 

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