Thanks. I used passback by assessment once. The main problem was that students would do things like this: they want to work on homework #5. But they click the LTI link for Homework #2 to log into WeBWorK, and then navigate within WeBWorK to Homework #5. But until they've clicked the Homework #5 link at least once, WeBWorK denies access. And then they email me to complain. So I gave up on it for that reason.
WeBWorK Main Forum
Advice on separate grades for quizzes with LTI course grade mode
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