blackshoe, on 2015-January-02, 02:05, said:
It's not a question of need. it's a question of ensuring you don't make a mistake. I agree with Art; i was taught the same way.
Would you expect a professional chef to use a cookbook for a dish he's been making for years, just to "ensure he doesn't make a mistake"? When a cop pulls you over for speeding, do you think he should look up all the regulations, and instructions for using the radar gun, before writing the ticket? Or a tennis judge, do you think he looks up the rules for a fault every time he calls one?
One of the marks of expertise in an area is that you have internalized most of the routine aspects of the activity. Of course no one is perfect, and there are situations that don't come up very often, so they should have the lawbook nearby to consult in these cases. But if someone has been a TD for years, and they can't handle the top 10 irregularities off the top of their head, they should probably find another line of work.