The article by Kirk Warren Brown and Richard M. Ryan explores the role of mindfulness in psychological well-being. Mindfulness, rooted in Buddhist and other contemplative traditions, is defined as the state of being attentive and aware of the present moment. The authors develop and validate the Mindful Attention Awareness Scale (MAAS), a measure of dispositional mindfulness, and examine its psychometric properties. Studies show that mindfulness is related to various well-being constructs, differentiates mindfulness practitioners from others, and is associated with enhanced self-awareness. Experience-sampling studies demonstrate that both dispositional and state mindfulness predict self-regulated behavior and positive emotional states. A clinical intervention study with cancer patients shows that increases in mindfulness over time relate to reduced mood disturbance and stress. The research highlights the importance of mindfulness in fostering informed and self-endorsed behavioral regulation, enhancing well-being, and promoting positive psychological experiences.The article by Kirk Warren Brown and Richard M. Ryan explores the role of mindfulness in psychological well-being. Mindfulness, rooted in Buddhist and other contemplative traditions, is defined as the state of being attentive and aware of the present moment. The authors develop and validate the Mindful Attention Awareness Scale (MAAS), a measure of dispositional mindfulness, and examine its psychometric properties. Studies show that mindfulness is related to various well-being constructs, differentiates mindfulness practitioners from others, and is associated with enhanced self-awareness. Experience-sampling studies demonstrate that both dispositional and state mindfulness predict self-regulated behavior and positive emotional states. A clinical intervention study with cancer patients shows that increases in mindfulness over time relate to reduced mood disturbance and stress. The research highlights the importance of mindfulness in fostering informed and self-endorsed behavioral regulation, enhancing well-being, and promoting positive psychological experiences.