on the part of, on behalf of, by
On the part of is a correct but often a wordy substitute for the preposition by or from.
- Wordy: The CEO expects a greater effort on the part of your staff in the next quarter.
- Concise: The CEO expects a greater effort by (or from) your staff in the next quarter.
On the part of is not a synonym for on behalf of.
- I would like to thank the committee on behalf of (not on the part of) all those who received awards today.
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