The Prerequisite Assignment is used to set requirements based on other published assignments in the course so that students cannot start the assignment until they have been met.
The prerequisite states that can be set are:
Passed (with a minimum grade)
Multiple assignments can be included if necessary but they all will have the same prerequisite state.
When enabled, students can start the assignment if the requirements are met. If not, they will receive a message advising them of the prerequisite requirements.