Enrolment

Hello,

I'm working on setting up Moodle courses for a "learn at your own pace" type of coursework and I'm wondering if there is anyway to automate access to subsequent courses upon successful completion (80% or higher grade, etc) of a test for a previous course? I know that we could manually do this by verifying the quiz grade and then sending out an access code via email to the student, but we are looking to automate as there will be too many students worldwide to easily keep up with.

Thanks for any help you can give me.