Ok, how about Wikipedia:
>As stated by Fung et al. in the revision to the classic engineering text, Foundations of Solid Mechanics:
"Engineering is quite different from science. Scientists try to understand nature. Engineers try to make things that do not exist in nature.
>Scientists study the world as it is; engineers create the world that has never been.
—Theodore von Kármán
>There exists an overlap between the sciences and engineering practice; in engineering, one applies science. Both areas of endeavor rely on accurate observation of materials and phenomena. Both use mathematics and classification criteria to analyze and communicate observations.
>In the book What Engineers Know and How They Know It, Walter Vincenti asserts that engineering research has a character different from that of scientific research. First, it often deals with areas in which the basic physics and/or chemistry are well understood, but the problems themselves are too complex to solve in an exact manner.