What does the Price for Work Done to Date mean under NEC4 Options C, D and E?

Under the target and cost reimbursable options the Price for Work Done to Date is a cost figure, and its definition in clause 11.2 is the total Defined Cost which the Project Manager forecasts will have been paid by the Contractor before the next assessment date, plus the Fee. Three features of that definition drive the arithmetic. It is a forecast of cost paid, not cost incurred or invoiced, so cost not paid until after the next assessment date is not in this assessment. It is Defined Cost as clause 11.2(24) defines it for these options, the cost of the components in the Schedule of Cost Components less Disallowed Cost, so the forecast is only as good as the records behind each component. And the Fee is applied to the net figure. Disallowed Cost is defined in clause 11.2 and covers cost not justified by the Contractor's accounts and records, cost which should not have been paid to a Subcontractor in accordance with its subcontract, the cost of correcting Defects after Completion, the cost of resources not used to Provide the Works, and cost incurred only because the Contractor did not give an early warning which the contract required it to give. Under Options C and D the Price for Work Done to Date is also the figure compared against the target when the Contractor's share is assessed; under Option E it is simply what is paid. What goes wrong: applications that list invoices received rather than cost that will have been paid; records that cannot tie a cost to a component, so it is disallowed; the Fee applied before Disallowed Cost is deducted; idle plant or labour presented as Defined Cost when it was not used to Provide the Works; and Defect correction after Completion buried in labour returns. A Contractor that cannot open its accounts and records to the Project Manager is paid less than its cost.