Kids can do it individually, in groups or as a whole-class activity.
This works for creative writing projects, too. Heck, I've even seen my 11th-graders do it before writing a long essay. The folks at Inspiration have sold an adult version of this software for years. This is the kids' version, aimed at grades K-3. The tools have been greatly simplified and a speech component has been added, making it easier for struggling readers or nonreaders to join the party.