I'll just quote todays "event":
The Commander on a soon to depart Ryanair-flight contacts de-iceing over the VHF, and request that one of the sprayers come to the aircraft.
A sprayer is sent to the aircraft with a de-iceing truck, and is met by the Commander with the following statement:
"Heyh! You see... I'm from Brazil, and i dunno **** about ice... Could you tell me if i need to de-ice or not?"
Now.. The answer to that question was simple:
No precipitation= Full de-iceing
With precipitation= Full anti-iceing
At least nobody can say that the sprayer made the wrong call since he made the safe one... ....but he who made the decision to send a commander that was unfamiliar with the concept of contaminated wings, to a destination that will usually result in frost on the wings of the 737 on a short turnaround.... ...that's the guy who made the bad call in my opinion....