Assessment of additional work in terms of Impact on the programme

Project Manager instructs a change to the Scope to include additional works A and Additional works B. A will not delay Completion, but B will.

How are these additional works A and B assessed in terms of their impact on the programme?

The assessment of delay varies slightly across the NEC suite of contract, but assuming that your contracts is an NEC4 ECC Contract, the assessment of delay is based on the following clauses 15.1, 32.1 and 63.5.