The video shows you how to set up choice eliminator 2 which is an add-on for Google Forms. The add-on allows you to set limits on how many responders can choose a particular option from a multiple choice question. Once the limit has been reached, it will be removed from the question for future responders. The add-on is typically used for eliminating choices when signing up for things such as extra help slots, parent meeting appointment times, and snacks for a party. However, this tweak that I learned from a recent GAFE Summit showed us how to use it to randomly group participants based on their responses to the question.