Rizzo, Mario J.  Time, Uncertainty, and Disequilibrium
New York: 1979. ISBN 0699026980

Put another way, action is a learning process. As the individual acts to achieve his ends, he learns and becomes more proficient about how to pursue them. But in that case, of course, his actions cannot have been efficient from the start—or even for the end—of his actions, since perfect knowledge is never achieved, and there is always more to learn.