10 Our evaluation proceeded whenever possible through corroboration of independent sources; for example our interpretation of the risk registers used by the joint purchasers was cross-referenced to equivalent risk documentation and interview evidence from bidders representatives.
11 As is our standard practice, we circulated copies of the draft report in confidence to the Department and to the bidders identified in the report. We asked for and obtained comments from them, and after a process of clearance, received confirmation from them that the facts contained in the report, their presentation and the conclusions we had reached were fair.