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Lesson Learned

To ensure a useful and applicable evaluation Cost Benefit Analysis (CBA), MCC Economic Analysis should save, to provide to evaluation teams, the MCC ex-ante Economic Rate of Return (ERR) models and supporting documentation.

To ensure a useful and applicable evaluation Cost Benefit Analysis (CBA), MCC Economic Analysis should save, to provide to evaluation teams, the MCC ex-ante Economic Rate of Return (ERR) models and supporting documentation. This includes both the ex-ante CBA spreadsheets and the ex-ante Highway Development and Management (HDM-4) Model or the Roads Economic Decision (RED) Model workspace files. In Ghana, the evaluation team did not have access to the MCC ex-ante ERR models or the underlying ex-ante HDM-4/RED workspaces for any of the road investments, and as a result had to try their best to re-create the ex-ante models as well as possible to be able to explain why the ex-ante and evaluation ERR estimates differed.