The Participants must maintain for the Relevant Period, a complete set of:
(a) all records which show how the TOC was calculated and how any Adjustment Events were valued for the purposes of clause 12;
(b) all purchase orders, invoices, accounts, records and bank statements (to the extent they relate to the Works) under good and accepted accounting principles showing all of the Reimbursable Costs reasonably and actually incurred in the performance of the Works; and
(c) all correspondence, tenders, Subcontracts, minutes of meetings, notes, reports, drawings, as-constructed information and all other documentation associated with the Works.