“…The aim of the literature review was to identify PPIs that have been empirically validated and were used with people with symptoms of depression, anxiety or stress. The most commonly used and empirically validated interventions were the 1) three good things (Seligman, Steen, Park, & Peterson, 2005), 2) using your strengths in a new way (Seligman et al, 2005;Wood, Linley, Maltby, Kashda, & Hurling, 2011), 3) goal setting (MacLeod, Coates, & Hetherton, 2008;Sheldon, Kasser, Smith, & Share, 2002), 4) savoring techniques (Smith, Harrison, Kurtz, & Bryant, 2014), 5) positive relationships (Coan, Schaefer, & Davidson, 2006; Reyes-García, Godoy, Vadez, Ruiz-Mallen, Huanca, Leonard et al, 2009), 6) best possible self (King, 2001;Layous, Nelson, & Lyubomisky, 2013), 7) capitalising positive news (Gable & Reis, 2010;Demir, Haynes, & Potts, 2017;Demir, Tyra, & Özen-Çıplak, 2018), and 8) random acts of kindness (Lyubomirsky, Sheldon, & Schkade, 2005;Otake et al, 2006) (See Table 1).…”