This paper presents the methodology and some of the findings on school behaviour obtained for the National Behaviour and Attendance Review (NBAR) in Wales. This work was undertaken over two years between 2006 and 2008. The Report was widely circulated in Wales to schools, local authorities, health and social service departments, as well as a wide range of professional and voluntary organisations in the autumn of 2008. The Review was written, led and chaired by the author. The Report was presented to the Minister for Children, Lifelong Learning and Skills and the Welsh Assembly Government, who subsequently endorsed the full Report on a cross-party basis. Thereafter, an Implementation Group was established to carry forward the 92 recommendations on attendance, behaviour, parenting, multi-agency working and children and young people. The methodology included both qualitative and quantitative approaches. This paper, however, focuses upon the findings obtained from the professional focus groups located throughout Wales during both Stage One and Stage Two of the review process. The evidence is discussed in context and both the core and supporting recommendations formulated from this approach are presented in the text.