This chapter identifies the 14 enduring principles of world-class writing teaching according to a rich review of all major meta-analysis since the 1980s. This review is supplemented by evidence taken from prominent case-studies which have looked to understand what it is the most effective teachers of writing do in their classrooms that makes the difference. The authors share instructional decisions which have a proven track record of being effective across time and context. The chapter is able to conclude that the most effective teachers of writing enact the principles of effective practice as identified in scientific study. These principles include: creating a community of writers; treating every child as a writer; reading, sharing, thinking, and talking about writing; pursuing authentic and purposeful class writing projects; pursuing personal writing projects; teaching the writing processes; setting writing goals; teaching mini-lessons; pupil conferencing; balancing composition and transcription; being a writer-teacher; being reassuringly consistent; and connecting reading and writing and interconnection of the principles. A brief description of each principle and its instructional consequences is also provided.