Writes for building services design organisations, contractors, clients and building owners and operators. States that the UK construction industry spends around 1billionGBP each year on rectifying defects and failures, some of which may be preventable through improved feedback to designers on the success and failures of installed plant and systems. The Egan report recognises the need for learning from experience and the need to feed this back into the project process and to inform future projects. Provides an overview of feedback within the building process and a detailed review of the use of feedback by design organisations. Makes recommendations for suitable feedback processes and systems to be used in design. Provides specific action plans for implementation for key feedback approaches.