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Longman Dictionary of Contemporary English
operational research
noun
EXAMPLES FROM CORPUS
▪ Graduates often enter other professions such as those of the actuary, accountant, and operational research scientist.
▪ In 1941 Williams became director of operational research at Coastal Command.
▪ It has, today, been adapted to measure the effectiveness of operational research.
Wiktionary
operational research

n. (alternative form of operations research English)

Usage examples of "operational research".

Their purposes were manifold, but especially included analysis by BuWeaps and Operational Research, the Navy commands charged with evaluating and updating tactical doctrine.

Karlstrom's official title was Director of Operational Research - a shell organisation with its own staff.

Once a planetary engineer on Venus Initial Station for Operational Research (VISOR), now a researcher in Charonian symbology.

For the first time in history scientists are marrying the insights of artists, poets, dramatists, and novelists to statistical analysis and operational research.

Rear Admiral Victor Lewis, Director of Operational Research replied.

Much more fascinating, in my opinion, is the operational research angle.