In order to participate in experiments at the Experimental Economics Laboratory at University of Maryland (EEL-UMD), you must register in our database using the lab's online recruitment system. Part of this registration process involves acknowledging the following basic rules of conduct:

• You can only register once in the ORSEE database. Registering multiple accounts undermines our scientific research. Any participant found with more than one profile will be excluded from all future studies.
• Only current students at University of Maryland are eligible to participate in experiments. You must bring your unexpired University of Maryland ID card to each session, so that EEL-UMD researchers can verify your status.
• A certain number of registered persons will receive an invitation email to each experiment. The exact number is determined by the researcher conducting that experiment. Only the invited persons may take part in that experiment.
• If you receive an invitation email, you must respond affirmatively in order to participate. Spaces in an experiment are limited, so it is important to respond early to better ensure that a space will still be available. Important Note: Once you respond affirmatively, you cannot later withdraw this response from the recruitment system, so please verify that you are actually able to come before you respond.
• Usually, some extra persons are invited to ensure that a minimum participation level is achieved. Alternates will receive compensation for arriving for the experiment on time. The exact amount of this payment is determined by the researcher conducting that particular experiment, and will be described in the invitation email.
• Participants will usually be compensated based on the decisions they make during the experiment. The exact amount of this payment is determined by the researcher conducting that particular experiment, and will be described in the invitation email.
• Important Note: After the scheduled start time, anyone who responded affirmatively to an invitation but did not show up will not receive any compensation for that experiment. In addition, he or she will be charged with a "no-show penalty." After a person receives 2 no-show penalties, he or she will be permanently removed from the database, and will be ineligible for any further experiments.
• During an experiment, participants must follow the directives of the researchers. The researchers will identify themselves before the commencement of the experiment.

The Experimental Economics Lab (EEL) of the University of Maryland is bound by the University of Maryland's Institutional Review Board (IRB) System Policy on Human Subjects of Research.

EEL's research-ethics responsibilities include the proper safeguarding of potentially sensitive data collected during an experiment. EEL takes the following steps to meet its confidentiality requirements:

• All data collected during recruitment is stored on a server that is accessible only to EEL research staff. These data are used only for the purpose of recruiting subjects to participate in EEL experiments.
• All personally-identifying data collected during an experiment (e.g., your name) is processed according to the approved ethics document of the respective study. Usually, any personal information is replaced with a code number, and the list linking code numbers to personally-identifying data is kept separate from the experimental data.
• All human-subjects forms containing personally-identifying information (e.g., informed consent) are stored in secure locations.

As a human-subject participant at EEL, it is your right to lodge a complaint if you believe that sensitive information about you collected during an experiment has not actually been kept confidential. Such complaints can be delivered to the IRB Liaison of the UMD Economics Department, Erkut Ozbay.