The purpose of the current study is to examine stakeholder perceptions of coaching principles and practice within a coach training programme with experienced teachers across 5 countries. Semi-structured interviews were carried out with professionals working with fellow teachers undergoing coach training. The aim of the interviews was to collect perceptions of those who work with coach trainees, in terms of changes in their practice and attitude. In addition, a survey was administered to those teachers undergoing coach training to elicit self-reported ideas of competency and relevance of the competence details within the ICF guidelines. The outcomes of the study imply that coach training can achieve early and rapid improvements to practice, with wider positive effects within schools. The procedural aspects of coaching were more easily achieved and practised by trainees. Those aspects which required higher-order practices or changes in attitude and beliefs were less readily adopted and were often seen as less important to coaching practice. However, there is a reason for optimism in that those attributes that are recognised as important are reported as being achieved at higher levels and there appears to be potential for a pedagogical approach to the development of coaching competencies.