The know-how handed down today is not only the craft of single practitioners but also a vast literature of words, numbers, and pictures that describe and give directions.
But the results of changing the world are often complicated and unpredictable.
Indeed, the techniques of shaping tools are taken as the chief evidence of the beginning of human culture.
On the whole, technology has been a powerful force in the development of civilization, all the more so as its link with science has been forged.
Chapter 12, Habits of Mind, includes some skills relevant to participating in a technological world.
In earlier times, technology grew out of personal experience with the properties of things and with the techniques for manipulating them, out of know-how handed down from experts to apprentices over many generations.