operational research 
(also operations research)
noun [mass noun]
A method of mathematically based analysis for providing a quantitive basis for management decisions.The majority of our analysts have advanced degrees in technical areas, such as operations research, mathematics, engineering, and management sciences....
- The majority of the analysts have advanced degrees in technical areas such as operations research, mathematics, engineering, and management sciences.
- The conference will cover many areas of mathematical sciences like astronomy, statistics, operations research, computer science and many other mathematically related subjects.