Instructors who would like to use CGS for their course may request an instructor account by completing the form below (instructor accounts are not issued to students). After submitting this information, you will receive an email with your login information. New users will have free and unlimited access to CGS for three months. After this trial period, you can choose to renew the account if you want to continue using CGS with your students. Beginning in 2009, a fee is required to renew an instructor account. Click here for more information.