The delay is assessed as the length of time that the compensation event delays planned Completion, which is assessed using the Accepted Programme.
Where the Accepted Programme is 'out of date' then this should be updated to the point in time when the CE actually occurred, regardless of when it was actually notified.
The assessment measures the affect on the programme operations which are specifically due to the CE, without taking account of other issues which could 'contaminate' the assessment, unless these are directly impacted by the CE..
NEC have written a practice note 'assessing delays due to compensation events' which you may find helpful. It can be downloaded from;
https://gmhplanning.co.uk/downloads/nec4-practice-note-1-rules-assessing-compensation-events-accepted-programme/
Where the Accepted Programme is 'out of date' then this should be updated to the point in time when the CE actually occurred, regardless of when it was actually notified.
The assessment measures the affect on the programme operations which are specifically due to the CE, without taking account of other issues which could 'contaminate' the assessment, unless these are directly impacted by the CE..
NEC have written a practice note 'assessing delays due to compensation events' which you may find helpful. It can be downloaded from;
https://gmhplanning.co.uk/downloads/nec4-practice-note-1-rules-assessing-compensation-events-accepted-programme/