Business
Business is the activity of making one's living or making money by producing or buying and selling goods or services. Simply put, it is "any activity or enterprise entered into for profit. It does not mean it is a company, a corporation, partnership, or have any such formal organization, but it can range from a street peddler to General Motors." The term is also often used colloquially (but not by lawyers or public officials) to refer to a company, but this article will not deal with that sense of the word.
Engineering
Engineering is the creative application of science, mathematical methods, and empirical evidence to the innovation, design, construction, operation and maintenance of structures, machines, materials, devices, systems, processes, and organizations. The discipline of engineering encompasses a broad range of more specialized fields of engineering, each with a more specific emphasis on particular areas of applied mathematics, applied science, and types of application. See glossary of engineering.
Management
Management (or managing) is the administration of an organization, whether it is a business, a not-for-profit organization, or government body. Management includes the activities of setting the strategy of an organization and coordinating the efforts of its employees (or of volunteers) to accomplish its objectives through the application of available resources, such as financial, natural, technological, and human resources. The term "management" may also refer to those people who manage an organization.
Engineering
Engineering is too important to wait for science.
Benoît Mandelbrot As quoted in "Fractal Finance" by Greg Phelan in Yale Economic Review (Fall 2005)
Business
All businesses operate below their true potential. That is unavoidable, given the fallibility of human beings.
Robert Heller, British management journalist and author. 'The Competitors', Chapter 10, The Decision makers (1989).
Engineering
A man should build a house with his own hands before he calls himself an engineer.
Alexander Solzhenitsyn (1963), One Day in the Life of Ivan Denisovich, p. 98