exacting (adj) - rigid or severe in demands or requirements [ig-zak-ting]
BREAKDOWN: EX- (completely) + ACT- (drive) + -ING (act or state)
to exact is to demand, require, or force
exact means in strict agreement with fact, standard, or truth; precise
“Both pure and applied science have gradually pushed further and further the requirements for accuracy and precision. However, applied science, particularly in the mass production of interchangeable parts, is even more exacting than pure science in certain matters of accuracy and precision.” —Walter A. Shewhart