122. Governments inexperienced in PPP procurement will often write very complex tender documents containing detailed technical specifications. This risks losing one of the main benefits of PPPs - the ability of the private sector to apply its innovation, experience and expertise to lower costs while providing the service desired. PPPs can achieve major cost savings - up to 33% in some cases - through a radical project redesign and changes in construction techniques, if the private party is free from detailed technical specifications. By specifying outputs (quality of infrastructure and availability) rather than inputs, PPPs also assign construction and design risks to the SPV rather than the public party (OECD/International Transport Forum, 2013). Tender documents should focus on functional outcomes, not technical requirements.