There are different and distinctive educational systems within the United Kingdom. This article discusses research and development work commissioned by the Scottish Office Education and Industry Department to support the continuing professional development of staff development co-ordinators (SDCs) in Scottish schools. The developing Scottish approach to CPD is examined and the principles underpinning the interactive resource (CDi) produced are discussed. The authors considered elements of the substantial body of knowledge about the principles and practice of professional development including examining the literature, building on the extensive Scottish experience of national planning and provision, and by using a focus group and discussions with practitioners to test ideas and to inform the resource. The problematic nature of the role of SDC is emphasised throughout and lessons from the development are shared.