The article by Ruth Baer, titled "Assessment of Mindfulness by Self-Report," discusses the importance of assessing mindfulness in understanding its relationships with psychological functioning, health, and well-being. Currently, mindfulness is primarily assessed using self-report questionnaires, which have reasonable psychometric properties and contribute significantly to the field. The author highlights that while differences between psychological and Buddhist conceptions of mindfulness are inevitable, they are not necessarily problematic. These differences can be useful for scientific and clinical purposes. The article also reviews the psychometric properties of commonly used mindfulness questionnaires, such as the Mindful Attention Awareness Scale (MAAS), the Five Facet Mindfulness Questionnaire (FFMQ), and the Kentucky Inventory of Mindfulness Skills (KIMS). These questionnaires have strong internal consistency, test-retest reliability, and factor structure, and their construct validity is generally strong. However, additional research is needed to better understand the conditions that lead to the acquisition of mindfulness skills and to explore the incremental validity of mindfulness measures over other factors like neuroticism and negative affectivity. The article concludes that while self-report questionnaires have limitations, they have made significant contributions to the understanding of mindfulness in psychological science, and further research is needed to refine these assessments.The article by Ruth Baer, titled "Assessment of Mindfulness by Self-Report," discusses the importance of assessing mindfulness in understanding its relationships with psychological functioning, health, and well-being. Currently, mindfulness is primarily assessed using self-report questionnaires, which have reasonable psychometric properties and contribute significantly to the field. The author highlights that while differences between psychological and Buddhist conceptions of mindfulness are inevitable, they are not necessarily problematic. These differences can be useful for scientific and clinical purposes. The article also reviews the psychometric properties of commonly used mindfulness questionnaires, such as the Mindful Attention Awareness Scale (MAAS), the Five Facet Mindfulness Questionnaire (FFMQ), and the Kentucky Inventory of Mindfulness Skills (KIMS). These questionnaires have strong internal consistency, test-retest reliability, and factor structure, and their construct validity is generally strong. However, additional research is needed to better understand the conditions that lead to the acquisition of mindfulness skills and to explore the incremental validity of mindfulness measures over other factors like neuroticism and negative affectivity. The article concludes that while self-report questionnaires have limitations, they have made significant contributions to the understanding of mindfulness in psychological science, and further research is needed to refine these assessments.