Practical and realistic learners, keen to test ideas, theories and techniques.

a person who takes a practical approach to problems and is concerned primarily with the success or failure of her actions

One of the seven Attitudes. Its Positive Pole is Practicality; its Negative Pole is Dogma. Pragmatists see the world in terms efficiency and since this is the neutral Attitude, it will use any of the other 6 Attitudes seen as most efficient for the situation.  When this efficiency works, it is Practical; when repetition becomes the only form of efficiency, this is Dogma.

an idealist's greatest adversary

an adherent of philosophical pragmatism

One who is pragmatic.