"The Association for Specialists in Group Work (ASGW) Best Practice Guidelines", "ASGW Principles for Diversity-Competent Group Workers", and "ASGW Professional Standards for the Training of Group Workers" are foundational documents commissioned by ASGW to clarify our professional niche, articulate our common values, and enhance the professionalism of group work training and practice. This article describes the contents of the foundational documents, describes their value, and discusses how they can be used in training group workers.