Here’s a process for that 10%: wake up 30 minutes earlier to create a buffer that allows for unexpected events like traffic and for expected events like “I just can’t seem to be on time, maybe I’m sick.”
I’ve been in the 90% at times and in the 10% at others. People should be entitled to grace, and we shouldn’t just assume anyone who isn’t absolutely punctual is a malingerer. Unless you live alone on a thousand acres you’re perpetually giving other people grace for their foibles and they’re giving you grace for yours.
For example, if students enter from the rear of the room, then delayed students can join without disrupting the on-time students.
If we start the design process with the awareness that some students will be late, then we can design systems which support all students.