Understanding human motivation ought to be a good thing. It should help us to find out what we really want so that we can avoid chasing rainbows that… - David McClelland

It is important, therefore, to understand at the outset the simplicity of this book - what it can accomplish and what it cannot. What it does try to do is to isolate certain psychological factors and to demonstrate rigorously by quantitative scientific methods that these factors are generally important in economic development.

[In The Achieving Society, 'need for achievement' is uncovered by having individuals write stories based on pictures they see] the stories represented short samples of the things people are most likely to think about or imagine when they are in a state of heightened motivation having to do with achievement. It may be worth considering for a moment why fantasy as a type of behavior has many advantages over any other type of behavior for sensitively reflecting the effects of motivational arousal. In fantasy anything is at least symbolically possible... Overt action, on the other hand, is much more constrained by limits set by reality or by the person's abilities. Furthermore, fantasy is more easily influenced than other kinds of behavior.

The modern economist has become even more insistent in his belief that the ultimate forces underlying economic development lie, strictly speaking, outside the economic sphere. As Meir and Baldwin put it, half humorously, “economic development is much too serious to be left to economists.” (1957, p. 119)