Some learning management systems allows to complete the courses without any attention of the study content, the student just enters final examination test and fails. And then tries to repeat the exam as many times as allowed. In some cases is successful.
Either way, failing or succeeding by many trials isn’t any good and doesn’t bring the requested skills or know how of the user. Usually good content is sequenced in the way to let the student understand all content from its basics and this way ensures maximum level of understanding and transferring the knowledge.
Prerequisite helps the course completion
The way to force user browse and adopt the study content is locking lessons unless the previous lesson is completed, we call it a prerequisite.
In a bigger educational projects it may be used for courses as well which ensures that all contents are passed in a proper way.
Increase your effect on your electronic e-learning by letting users study in a proper order and getting maximum skill level at a first time! It will turn into your business profitability indeed!