Offers an exposition of the Practice Development Unit (PDU) approach developed at a Seacroft Hospital. Intended as both a theoretical and practical resource, it analyzes the background and origins of the unit and the methods of its development. The theory behind the PDU model is outlined and the key principles underpinning it are identified. The PDU approach is differentiated from the Nursing Development Unit model. Implementation of key principles is explored, with reference to specific work carried out in the PDU. Issues of evaluation, potential future developments and applications of the PDU model are also discussed.