"The branch of science that deals with human work and the efficient use of energy, including anatomical, physiological, biomechanical, and psychosocial factors." does not have to deal with furniture only....

My INTj friend has degees in botany and soil science. A lot of his ideas when I talk about horticultural genetics are about productivity, usefulness of mass crops, efficiency of usage.... For example, he was curious if I could make a Japanese Ramana Rose hybrid to have gold blooms (which is a highly productive color due to ultraviolet spectrums and insect attraction to pollen) with better a branching habit (which equates to more blooms due to more stems within vertical and horizontal space) yet retain their massive hip size while reducing the seed count. This way he could use the same amount of land for: rose honey, rose beer and rose jam (personally Id use the September harvest of ping pong sized hips for vitamin C tablets but whatever) in the most efficient way possible.


So, as you can see, many things can be efficient uses in the terms stated...