An Engineer uses mathematics and science in acquiring & applying technical skills to design and implement devices, machines, materials, processes, structures, & systems. The American Engineers' Council for Professional Development (ECPD) defined engineering as, "...the creative application of scientific principles to design or develop structures, machines, apparatus, or manufacturing processes, or works utilizing them singly or in combination; or to construct or operate the same with full cognizance of their design; or to forecast their behavior under specific operating conditions; all as respects an intended function, economics of operation and safety to life and property.”  In 1980 the ECPD evolved into the Accreditation Board for Engineering and Technology (ABET).

Some engineering disciplines include: Aerospace, Agricultural, Biomedical, Ceramics, Chemical, Civil, Computer Hardware, Electrical & Electronics, Environmental, Industrial, Marine, Mechanical, Mining, Navel, Nuclear, & Petroleum.