The 9-item PMH-scale was developed in order to provide a brief, uni-dimensional and person-centered instrument to assess positive mental health (Lukat et al. 2016). The concept of positive mental health combines mainly emotional, but also psychological and social aspects of well-being into a single general construct. People who are mentally healthy tend to have stable relationships, view their lives as having purpose and direction, experience more positive affect, and are more likely to be self-accepting. The PMH-scale assesses mainly emotional, but also psychological and social aspects of well-being. Psychometric testing confirmed the scale to be a unidimensional self-report instrument with high internal consistency, good retest-reliability, scalar invariance across samples and over time, good convergent and discriminant validity as well as sensitivity to therapeutic change in a series samples from very different backgrounds. Participants respond to statements such as “I am often carefree and in good spirits, I enjoy my life, I manage well to fulfill my needs, I am in good physical and emotional condition" on a 4-point Likert scale ranging from 0 (do not agree) to 3 (agree). Item scores are combined into a sum score with higher scores indicating higher positive mental health.