We investigated the effectiveness of coaching as a nondirective consultancy method in individual and company development programs. The group of 24 coaches was interviewed and resulting qualitative data were analysed with the use of Grounded Theory. The coaches represented wide spectrum of coaching schools like systemic, Gestalt, Rogers, Ericksonian, NLP, psychoanalytical, managerial or generally psychological. We were able to generate a general model of efficient coaching methodology common to all these approaches and also to define necessary coaching competences (in the areas of methodology, practice, relationship, personality, maturity and self-reflection of the coach). On top of that we identified 16 different coaching techniques that proved themselves to be the main reasons for achieving change and progress in real client cases. As examples we can mention: • constructive questions instead of an advice • goals specification, visualisation and imagination • inspiring belief and real decision • solution and not a problem focus • searching for internal resources and exceptions • use of metaphors, stories, pictures and reflections • externalisation, experiential experiments • etc.