This report summarises the key achievements and findings from November 2011 until December 2014 based on an analysis of the data that has been gathered over this period. We then draw some conclusions and recommendations on how CoST can be further improved. The report is written in the context of the UK Department for International Development agreeing to invest up to £7m over 5 years in the programme. A condition of this funding is a strategic review of the CoST programme.