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Welcome to the XS/FS Recruitment Server

At XS/FS, we study how individuals and groups make choices in a variety of situations. Our goals are to gain insights into how decisions are made, and to inform policy making in economics, political science, and business. We invite you to participate in our research by signing up for our subject pool. You can earn a little money, have some fun, and help research at COSS!

After signing up, you will receive e-mails announcing upcoming experiments. These e-mails give details on the experimental sessions, as well as a link allowing you to sign up for available sessions. Registering for the subject pool does not obligate you to participate in any experiments. Participation is purely voluntary, and we bear no ill will towards anyone who doesn’t volunteer. If you decide you no longer wish to receive any e-mails, you can remove yourself from the subject pool by following the link at the bottom of the e-mail.

Experiments last anywhere from 30 minutes to two hours (the announcement email tells you when the session will start and how long it will last) and are conducted at a variety of times during the week. You will earn a guaranteed 5-10 dollars for participating in a session (the exact amount depends on the length of the session and will be contained in the announcement email), as well as additional earnings while making decisions in the experiment. The exact amount of money you earn will depend on the rules of the experiment, your decisions, and possibly decisions made by other participants. Typically, earnings average 10-15 dollars per hour. Individual earnings in any given session may vary and, therefore, this amount is not guaranteed.

Current FSU Students: If you are a student at Florida State University, you can sign up to participate in future experiments and earn money for doing so. Please click on the Sign Up link in the menu on the left. To register, please select the "Current FSU students" link. You will need to provide your name and e-mail address. You must use your FSU e-mail address ending with

These experiments are in no way a test related to any class. Your instructors won’t know whether you participate in our experiments, nor will they know any of your decisions in the experiments.

FSU Alumni: If you did not participate in our experiments as a student, you can join the database now. Please click on the Sign Up link in the menu on the left, and then select the "FSU Alumni" link. In order to register, you will need to provide your name and an e-mail address. We will also ask for your FSU e-mail address for verification.

If you did participate in our experiments as a student and would like to be invited to alumni studies, please do not register a new profile. Send us a request with your name, FSU ID and a current e-mail address to, and we will update your existing profile.

Post-Registration: Once you register, you will receive a confirmation e-mail with a link. Click on that link to confirm your registration. Without confirmation, your registration will not be activated, and you will not be able to participate in experiments.

For questions please contact