If there are no books out, you need to come back and keep checking until there are. Don't lose this, as it tells you the name of the Experiment you are participating in, where to go and when. Here you will find the PSYC 100 - Subject Pool List of Participants table which shows all of the experiments running, who is running them, and where. Always take your Subject Pool Card to the appointment with the researcher .
Cards are due no later than the last day of scheduled classes for the course.