In order to participate in experiments conducted by researchers of the Nuffield Centre for Experimental Social Sciences, a person has to register online ( and sign a consent form indicating that you understand the rules and consent to take part in experiments at CESS. This form may be signed at the time of the first participation in a laboratory experiment.

Rules for laboratory experiments

  • By registering for laboratory experiments, you indicate your intention of taking part in experiments conducted by researchers of the CESS.

  • For each experiment, a certain number of registered persons will get an invitation email. Only the invited persons have the right to take part in the experiment.

  • In case you get an email which invites you to participate in a particular experiment, you have to take the steps outlined in this email in order to be able to take part in the experiment. By doing so, you indicate your commitment to participate.

  • For each experiment, an excess number of participants will be allowed to register. Should more participants arrive than can be used, a random draw will be used to determine who will participate. Participants who register and show up but are not allowed to participate in the experiment due to capacity constraints or other failures are compensated with the show-up payment.

  • Every participant who registers for an experimental session and shows up on time will at least be compensated by a show-up payment of £4. Participants who arrive after the scheduled start of an experimental session and do not participate will not receive the show-up payment.

  • Usually, participation will be compensated in cash. The amount may depend on the participant's and other participants' decisions during the experiment.

  • During an experiment, each participant will have to act according to the rules stated by the researchers in the instructions. Subjects who do not obey experimenter instructions and lab rules may be asked to leave.

  • If you agree to take part in a particular experiment, you are expected to arrive at least 5 minutes ahead of time. This will help us start experiments on time. Additionally if you do not turn up or turn up late then the experiment might be cancelled because of a lack of participants.

For questions please contact

Nuffield College
New Road
United Kingdom
Tel: +44 1865 614991

This system is based on ORSEE, created by Ben Greiner. More information is available at
All other content © Centre for Experimental Social Sciences (CESS).