1) Are they doing the exercises in class or at home?
2) Is this a face-to-face, hybrid, or online class?
3) Do you have to give identical assignments to each student?
If in class, it should be easy to monitor unless you are tuned out.
If it is hybrid, provide a capstone that relies on skills learned with the daily assignments. This should be a proctored assignment. Make it more heavily weighted (home-formative, weighted lightly, in-class: summative, weighted heavily). If they've cheated on the home assignments, it won't matter because when it counts, they won't be able to do the work.
If online only and you don't need to give identical assignments, then vary the assignment instructions so that each student creates a unique drawing. For example, give a common complex project to each and ask each student to do a different part of it. Assignments should have equal difficulty but not be identical.
Most of my students want to learn and few, if any, cheat if they believe that the skill that is taught will be important to know for later work. The risk of cheating is proportional to level of frustration(feeling lost) and lack of time. To help with frustration and inability to do them, I provide videos that step beginners through how to do them.
They'll cheat in a heartbeat if its just busy work. Make sure to communicate why it's important that they actually learn something from the assignment besides how to copy.
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