There are some good (and not so good) examples of KPIs for a broad range of different contracts. This will be a useful resource to all Contracting Authorities in designing their own KPIs.
A list of central government’s most important contracts, also showing up to four relevant Key Performance Indicators (KPIs) for those contracts, and the performance of the vendor against those KPIs.
Key Performance Indicators (KPIs) for government’s most important contracts – GOV.UK (www.gov.uk)

