Systems Engineering Principles and Practice, 2nd Edition

1SYSTEMS ENGINEERING AND THE WORLD OF MODERN SYSTEMS

1.1 WHAT IS SYSTEMS ENGINEERING?

There are many ways in which to define systems engineering. For the purposes of this book, we will use the following definition:

The function of systems engineering is to guide the engineering of complex systems.

The words in this definition are used in their conventional meanings, as described further below.

To guide is defined as “to lead, manage, or direct, usually based on the superior experience in pursuing a given course” and “to show the way.” This characterization emphasizes the process of selecting the path for others to follow from among many possible courses—a primary function of systems engineering. A dictionary definition of engineering is “the application of scientific principles to practical ends; as the design, construction and operation of efficient and economical structures, equipment, and systems.” In this definition, the terms “efficient” and “economical” are particular contributions of good systems engineering.

The word “system,” as is the case with most common English words, has a very broad meaning. A frequently used definition of a system is “a set of interrelated components working together toward some common objective.” This definition implies a multiplicity of interacting parts that collectively perform a significant function. The term complex restricts this definition to systems in which the elements are diverse and have intricate relationships with one another. ...