I would start with clauses 11.2(28) which, in part states, that the Price for Work Done to Date is the total of:
• the quantity of the work which the Contractor has completed for each item in the Bill of Quantities multiplied by the rate and
• a proportion of each lump sum which is the proportion of the work covered by the item which the Contractor has completed.
Since the PWDD is based on the quantity of completed work, the BoQ is subject to remeasure. Note the quantity of work completed is in respect of the quantity completed to provide the Works Information measured in accordance with the Method of Measurement which may not be the actual physical quantity of work done.
The compensation event provisions deals with “change” and how this is incorporated into the BoQ
• the quantity of the work which the Contractor has completed for each item in the Bill of Quantities multiplied by the rate and
• a proportion of each lump sum which is the proportion of the work covered by the item which the Contractor has completed.
Since the PWDD is based on the quantity of completed work, the BoQ is subject to remeasure. Note the quantity of work completed is in respect of the quantity completed to provide the Works Information measured in accordance with the Method of Measurement which may not be the actual physical quantity of work done.
The compensation event provisions deals with “change” and how this is incorporated into the BoQ