Abstract This chapter synthesises findings from two studies of coaching effectiveness and Psychological Mindedness. Study One developed the Coaching Effectiveness Scale, identifying seven coachee outcomes: career satisfaction, psychological factors, goal attainment, personal effectiveness, satisfaction with coaching, self-efficacy, and leadership/management. Study Two confirmed the psychometric properties of the CES and demonstrated that PM significantly predicts coaching effectiveness, linking self-awareness and reflective capacity to positive outcomes. The contributions of the studies reported include a validated measurement tool, a conceptual model of coaching outcomes, and evidence for PM as a transferable construct bridging clinical and organisational contexts. Limitations involve sample size and reliance on self-report, but findings advance theory, guide practice, and inform future research directions.