> Real idea synthesis, non-trivial 'show your work' calculation required -> hard to cheat And also harder to evaluate and grade; the professor or TA must be wi

> Real idea synthesis, non-trivial 'show your work' calculation required -> hard to cheat And also harder to evaluate and grade; the professor or TA must be willing to invest an hour or several in reading through the longer answers to see where the students went right or wrong. That would be no problem in a hypothetical ideal educational framework, but realistically TAs (even at Stanford) aren't always that dedicated.