c$.$ Why is difficult for an R&D project manager to layout a detailed schedule?

Scheduling activities for R&D projects is extremely difficult because of the previously mentioned problems with the constraints. Scientists do not like or want tight structuring because they feel that they cannot be creative without having sufficient freedom to do their job. Many good results have been obtained from spinoffs and other activities where R&D project managers have deviated from predetermined schedules.

d$.$ Who typically changes the schedule when the R&D project manager sets the schedule?

Executives and marketing basically to follow their needs rather than the projects needs.

e$.$ Why should the R&D project schedule be loose?

f$.$ Should marketing be supporting R&D projects if it originates putside the marketing department?

g$.$ Why is R&D project management in large companies difficult?