This open access book builds bridges between the science of coaching and coaching practice by analyzing the effects of coaching in detail and improving its practical effectiveness. Written by a proven expert in the field, it scrutinizes old and new methods of coaching and substantiates what still works and what does not. It provides guidance to silt the science from pseudoscience and charlatanism. Some of the topics it covers are: Simple and complex questioning methods, vision development, values analysis, strengths maps, narrative coaching, changing habits, executive communication, conflicts, stress management, burnout, health behavior, team coaching and coaching for organizational change (including e-coaching tools and artificial intelligence). The book collates the findings in an integrative, systemic theory of "result-oriented coaching" that is open to change, and addresses future developments in the coaching market, digitalization and artificial intelligent systems in coaching, with a plea for humanistic, science-driven and practice-based coaching.