I agree with the general point of this article. But it's interesting that it seems to leave out one of the main reasons to show your work when in SCHOOL -- par

I agree with the general point of this article. But it's interesting that it seems to leave out one of the main reasons to show your work when in SCHOOL -- partial credit. If a student goes off course during an early step in a multi-step problem, the teacher will often give credit for steps performed correctly after the incorrect step (in the US--not sure about other countries). If the student doesn't shown their work, they will receive 0/40 points for a wrong answer, instead of, say, 30/40.