Greater Wellington Regional Council (GWRC) commissioned Sinclair Knight Merz Ltd to update the Wellington Transport Strategy Model (WTSM) to a 2006 base year and to review, investigate and advise on a number of specific model aspects.

The reviews and investigations related to the base year have been undertaken, documented in a series of technical notes and the WTSM Update Specification Report. A Validation Report detailing the update of WTSM to a 2006 base year and setting out the 2006 validation was produced in December 2007.