What A group decision-making process which forbids negative feedback on any suggested alternative by any group member until all members have presented alternatives is known as?

The group decision-making process you are referring to is known as "brainstorming." In brainstorming, participants are encouraged to share their ideas freely without criticism, fostering creativity and the generation of diverse alternatives. This approach helps create an open environment where all members feel comfortable contributing, ultimately leading to more innovative solutions. After all ideas are presented, the group can then evaluate and discuss them.