"He recognizes the necessity to specify when violation of standards is problematic."
"He recognizes the necessity to specify what violation of standards is problematic."
"He recognizes the necessity to specify which violation of standards is problematic."
#2 and #3 are very similar. ' To b slightly facetious, you could answer the question When is violation of standards problematic? by saying 'on Tuesdays'.
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#2 and #3 are very similar.
#1 can also be similar, but it focuses a bit more on 'On what occasion is violation of standards problematic?'
To b slightly facetious, you could answer the question When is violation of standards problematic? by saying 'on Tuesdays'.
Clive