PMP Exam Simulator

The project requirements are being determined by you, the project manager and the project stakeholders. You and the stakeholders are brainstorming privately as many solutions to the project as possible. After the brainstorming session, a recorder documents all the solutions on a white board so everyone can see the ideas and how they may be related. After the solutions have been documented, there is a voting process to discuss and rank each idea and requirement that has been proposed. How is this requirement gathering technique called?