NEC3, ECC Clause 65.2 - Assessment of Compensation Event is not revised

Dear All

According to NEC3, ECC Clause 65.2, the assessment of a compensation event is not revised if a forecast upon which it is based is shown by later recorded information to have been wrong.

In the case, if measurement/quantities (from Drawings, not forecast) of an implemented CE based on PM’s assessment (assessment based on subcontracts’ unit rates) is found incorrect, can the Project Manager change the assessment and what basis?

In other case, can the Project Manager change the method of valuation for an implemented CE which is assessed by PM’s assessment and what basis?

regards
W K Yip