“In cases when” vs. “in cases where”

This is one I struggle with from time to time. Which is better?

  • Methodology X is more suitable in cases where users’ needs are well understood up front.
  • Methodology X is more suitable in cases when users’ needs are well understood up front.

Is one of these ungrammatical? Or is it purely a matter of personal preference?

Answer

Since you use “in cases…” I’d say where, because you specified a “location” when you said “is more suitable in cases where…”

You could instead use when if you deleted that part so:

…is more suitable when users’ needs…

Attribution
Source : Link , Question Author : Dan Tao , Answer Author : Alenanno

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