Theory
Theory here means general propositions used as principles
, not conjectures or proposals.
The Importance of Theory
A number of major disciplines (and their associated design methodologies) have some type of theoretical basis. Structural engineers design an unlimited variety of structures using the theories of physics. Composers create beautiful symphonies and orchestral pieces using the concepts found in music theory. The automobile industry uses aerodynamics theories to design more fuel-efficient vehicles. The aerospace industry uses the same theories to design airplane wings that reduce wind drag.
These examples demonstrate that theory is relevant and very important. The chief advantage of theory is that it helps you predict outcomes; it allows you to predict what will happen if you perform a certain action or series of actions. You know if you drop a stone, it will fall to the ground. If you are agile, you can get your toes out of the way of Newton’s theory of gravity. The point is that it works every time. If you chisel a stone flat and place it on another flat stone, you can predict that it will stay where you put it. This theory allows you to design pyramids and cathedrals and brick outhouses.