I am suprised at the confusion as the distinction between derate and assumed was clear from the first post.
Aerotech,
I am wondering if there will be significant change in aircraft performance if significant reduced thrust is used (for example assumed plus derated takeoff thrust) or even just assumed takeoff thrust.
Rather perversly, due to the lower VMCG/A derated thrust can increase the max takeoff weight on contaminated or slippery runways. I presume, for the same reason it may be possible to depart from a short runway that would be VMCG/A limited at full rated thrust too.