The Trait Meta Mood Scale (TMMS) is a self-report measure of perceived emotional intelligence (PEI) or meta mood experience which encompasses the processes of monitoring, analyzing, and regulating emotions. The TMMS consists of 30 items and three factors: Attention (focused awareness of feelings), Clarity (clear understanding of emotions), and Repair (mood repair). The Attention subscale assesses individuals’ level of attentiveness toward their emotions and moods. The Clarity subscale measures emotional clarity, which refers to the capacity to comprehend and differentiate between one’s own different emotions. The subscale of repair investigates mood repair, which refers to the capacity to manage and repair unfavorable emotional states. Initial studies have shown that TMMS exhibits strong internal consistency, test-retest reliability, discriminant validity, and convergent validity. Subsequent research has questioned the discriminant validity of the Repair subscale and construct validity of the Clarity subscale. Additional constraints encompass the cultural insensitivity of the Attention scale as well as the lack of situational specificity and mood specificity. Although the TMMS has several limitations, it has the potential to be useful in assessing emotional reflective processes, namely, an individual’s capacity to observe and regulate their emotions. The utilization of the scale has experienced significant growth across several cultural contexts. The original English version has been translated to at least six languages to date, namely, Chinese, French, German, Portuguese, Spanish, and Turkish. Overall, the TMMS has been widely used in clinical, educational, and organizational research. However, further improvement is needed in terms of the construct and discriminant validity of the TMMS.