When learning is expected to be completed in a prescribed way, it is considered an essential learning requirement. Essential requirements are the outcomes (including skills, knowledge and attitudes) all students must demonstrate with or without using accommodations.
The difference between essential and non-essential requirements is similar to the difference between "essential" and "preferred" skills listed in job descriptions. An employer may want to see both sets of skills, but only the essential skills are an absolute requirement of employment.
Similarly, in courses instructors can articulate essential outcomes that all students must demonstrate in order to successfully complete the course, as well as preferred outcomes they hope students will be able to demonstrate.
Once instructors have determined the essential course requirements they should be able to: