Running the Pick Random Storyform randomly assigns all the story points in your document.  This command honors all previous choices you have made (if any), while randomly assigning the remaining story point choices.

NOTE:  The Pick Random Storyform command follows the settings set up in the Spin-the-Model brainstorming tool.  This is important because it controls whether or not existing storyform choices and gists are honored or cleared when this command is invoked.