"Acceptable" percentage of users having problems / getting stuck
Inevitably there will be a handful of learners who get stuck in and are unable to finish a module. Finding out why may be straightforward or it might be an exercise in looking for a needle in a haystack. At what point do you stop putting resources into figuring out what the problem is? What is an acceptable percentage of users getting stuck or having problems with the module? (Of course the ideal is 0%, but we are at the point of diminishing returns and need to decide when to let go.). I know that the acceptable percentage will vary but it would be great to get a range of what folks experience and tolerate. TIA!