Approved Document L2 of the Building Regulations, for the Conservation of Fuel and Power in buildings other than dwellings, asks for building services systems including heating, lighting, mechanical ventilation and air conditioning, to be commissioned. The process involves drawing up a commissioning plan, carrying out commissioning so that the installed systems perform to the designer's specification, and the production of a certificate confirming that the commissioning has been carried out. This series of four Information Papers has been prepared as part of a BRE study undertaken for the DTi. They give advice for each of four groups on the contribution they might make to the procurement and delivery of buildings that are effectively and successfully serviced. The groups are: - clients - designers - specifiers - facilities managers 4 pages.