The inclusion criteria for participating in the study are:

• refugees and asylum seekers (RAS) aged 16 or older;
• residing in one of the participating local sites (Swiss municipalities, namely, Gemeinden, and transitional asylum centers, namely, Durchgangszentren) where PM+ is offered and which gave their consent for participation in the RCT;
• speaking at least one of the following 12 languages: German, English, French, Arabic, Farsi, Kurdish, Tigrinya, Turkish, Ukrainian, Russian, Tamil, and Pashto;
• obtaining a score of 20 or higher on the Kessler Psychological Distress Scale (K10; Kessler et al., 2002), a brief clinically validated screening questionnaire that assesses general psychological distress in the past 30 days. A score equal to or higher than 20 is used as an indication of moderate to high levels of psychological distress.

The exclusion criteria for participating in the study are:

• significant cognitive or neurological impairment measured through specific tools developed by the WHO and integrated into the PM+ manual (impairment questionnaire);
• acute medical conditions or severe mental disorders (e.g., psychotic or substance-abuse disorders) measured through specific tools developed by the WHO and integrated into the PM+ manual (impairment questionnaire);
• acute risk of suicide as measured by the Suicidal Ideation Attribution Scale (SIDAS; van Spijker et al., 2014) and the Thoughts of Suicide Questionnaire (World Health Organization WHO, 2016).