JPW in collaboration with Utzon Architects were appointed by the Sydney Opera House Trust to advise on future development works affecting the Sydney Opera House and its site. One of the first tasks was to establish, with Jorn Utzon, the design principles that will guide future works at the Sydney Opera House. The objectives were to safeguard the site for the benefit of future generations and to address the current practical limitations and the future design needs of a leading performing arts centre. The works include upgrading disabled access, tourist infrastructure, visitor and presenter facilities. The Utzon Design Principles and the Strategic Building Plan were developed and compiled by JPW with Utzon Architects in collaboration and were key documents in the Trust’s successful bid for World Heritage Listing which was granted in 2007.