Under the NEC Contract what is a quotation for acceleration comprised of?

Can you explain to me what is included within a quotation for acceleration.

A quotation for acceleration comprises proposed changes to the Prices and a revised programme showing the earlier Completion Date and the changed Key Dates (see Clause 36.1).

In simple terms it will be the additional cost that the Contractor believes he will incur to achieve the earlier Completion Date plus the perceived risk that he believes he additionally needs to protect himself in particular from delay damages if X7 has been used