The Association for Specialists in Group Work (ASGW) is committed to understanding how issues of multiculturalism and social justice affect all aspects of group work. This document reflects the updating and revision of a previous document entitled, "Principles for Diversity-Competent Group Workers," which was endorsed by ASGW in 1998 and published in the "Journal for Specialists in Group Work" in 1999. Multicultural and social justice concepts are often intricately linked; therefore, this document addresses both as they relate to group work. These intersections include (but are not limited to) the following domains: (1) training group workers who seek competency on issues of multiculturalism and social justice in group work; (2) conducting research that will add to the literature on group work with multicultural groups and social justice issues; (3) understanding how multiculturalism and social justice affect group process and dynamics; (4) assisting group facilitators in various settings to increase their awareness, knowledge, and skills as related to facilitating task, psychoeducational, counseling, and psychotherapy groups with diverse members; and (5) engaging in social justice change. The current revised document adds several new dimensions to the earlier version of the diversity principles: (1) Integration of multicultural and social justice competencies based on more recent literature; (2) Collapsing of awareness of group workers' and group members' worldviews into one subset, removal of attitudes and beliefs, knowledge, and skills sections under each dimension to avoid repetition and incorporation of the concepts throughout; (3) Integration of "ASGW Best Practice Guidelines" (2008) and an expanded delineation of skills under the skills and strategies section; (4) Introduction of a Social Justice Advocacy principles section; and (5) Provision of two examples of what a group worker who is seeking multicultural and social justice competence may "look like" or "be doing." The present competencies also draw from the scholarship on multiculturalism and recent research examining the previous "Principles for Diversity-Competent Group Workers" document. In addition, the recent scholarship on social justice, advocacy, and group work has been added.