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AbstractSystem dynamics models, as causal models, are much like scientific theories. Hence, in evaluating such models, we assume certain norms of scientific inquiry. Most critics hold that the system dynamics approach does not employ formal, objective, quantitative model validation tests. This article argues that this type of criticism presupposes the traditional logical empiricist philosophy of science, which assumes that knowledge is an objective representation of reality and that theory justification can be an objective, formal process. According to the more recent relativist philosophy of science, knowledge is relative to a given society, epoch, and scientific world view. Theory justification is therefore a semiformal, relative social process. We show that relativist philosophy is consistent with the system dynamics paradigm and discuss the practical implications of the two philosophies of science for system dynamics modelers and their critics.

Moderation was a triumphant discourse of Iran's eleventh presidential election. It's a new attitude in the political realm and most of the movements relate themselves to it and each one interprete their actions according to moderation. For clarifying this ambiguous trend, we should refer to its philosophical root. It seems that Aristotle is the first one who represented this theory. In fact, moderation is one of the main principles of Aristotelian ethics. Understanding this concept requires understanding the basic concepts of the intellectual and moral theory of Aristotle. Moderation is the center of his theory of virtue. According to this principle, all the moral virtues are intermediates and excess, and defects in the actions and emotions cause moral vices. This theory could be the best way to pass excess and deficiencies in Iran's political sphere.

Morsink asserts that all people have human rights simply by virtue of being born into the human family and that we can know these rights without the aid of experts. He shows how the 1948 Universal Declaration of Human Rights grew out of Enlightenment principles honed by a shared revulsion at the horrors of the Holocaust.