A system is a set of two or more elements that satisfies the following three conditions. (1) The behavior of each element has an effect on the behavi… - Russell L. Ackoff

The less sure managers are of their opinions, the more vigorously they defend them. Managers do not waste their time defending beliefs they hold strongly – they just assert them. Nor do they bother to refute what they strongly believe is false.

… All other languages can be translated into the thing-language, but the thing-language cannot be translated into any other language. Its terms can only be reduced to what are called "ostensive" definitions. These consist merely of pointing or otherwise evoking a direct experience. Hence, the thing-language is absolutely basic. Out of this basic language, we build up the other languages of the sciences, beginning with the language of physics, and proceeding to biology, psychology, and the social sciences.

In proactive problem solving we specify where we want to go, and we try to get there. Although such an approach does not eliminate the possibility of overlooking relevant consequences of our solutions, it reduces the probability of doing so. The more ultimate the desired outcome we specify, the more likely we are to consider the intermediate and long-run consequences of our immediate actions. The more immediate the source of dissatisfaction we try to get rid of, the less likely we are to take account of relevant consequences. Therefore, the chances of overlooking relevant consequences are minimized when we formulate a problem in terms of approaching one or more ideals.