The area of investigation known as general systems theory or research features the study of systems as interesting in its own right or one fruitful approach to the study of science in general. This leads to an interesting and still open problem, namely, explicating the concept of a system that seems to unify the interests of researchers in this area. Contrary to received opinion, I argue that there is a unique and interesting concept of a system that underlies the expressed interests of general systems researchers and that it can be given a satisfactory explication. The concept in question has systems as extralinguistic entities that we theorize about, namely, certain sorts of sets of re-related elements. Criteria for its explication are suggested; examples of systems, earlier analyses, and various objections are all considered in leading up to a partial formal explication of the concept and a statement of additional open problems.

One of the most persistent problems of marketing has been the question of what is meant by ‘marketing’. In the fifties and sixties discussion focused on the alleged scientific character of marketing. “Is marketing an art or a science?” was the principal question of the day [14], [5], [28]. This preoccupation with the procedures and the conceptual framework of marketing was followed by an eager interest in the contributions which clarification of marketing concepts could make to attaining the objectives of marketing managers. Managerial marketing and management science in marketing are the results of this identification of marketing with the objectives of its managerial users [16], [25]. More recently the emphasis has switched from procedures, conceptual framework, and objectives to the problem of the proper boundaries of marketing [19], [23], [18].

In concluding section 2, chapter VI of part II of [6], Duhem claimed:

1. (I) ... the physicist can never subject an isolated hypothesis to experimental test, but only a whole group of hypotheses ... ([6], p. 187)

2. (II) ... when the experiment is in disagreement with his predictions, what he learns is that at least one of the hypotheses constituting this group is unacceptable and ought to be modified; but the experiment does not designate which one should be changed'. ([6], p. 187)

According to our intuitions, certain generalizations are better confirmed by positive instances than others. In order to characterize the difference between these generalizations, I have proposed in [3] to investigate the generalizing behavior of living beings. Such an investigation makes it possible to classify into different categories the generalizations that are intuitively confirmed by their positive instances and those that are not intuitively confirmed by such instances. One important aspect of my treatment, however, has been shown to be unsatisfactory: sentences that are logically equivalent may belong to different categories. In this paper, I shall first give a short summary of the relevant parts of my previous paper, and then I shall try to improve it in order to avoid the undesirable result.

The works of Paul K. Feyerabend, Norwood Russell Hanson and Thomas S. Kuhn have come to occupy a central place in the annals of contemporary philosophy of science. Some of their contemporaries, ([1], [14], [20]), tend to regard them as the vanguard of a new “revolutionary” intellectual movement. Reacting against the views of their positivist predecessors, they embrace and propagate the idea that “pervasive presuppositions” are fundamental to scientific investigations. Thus, Feyerabend thinks that, “... scientific theories are ways of looking at the world; and their adoption affects our general beliefs and expectations, and thereby also our experiences and our conception of reality” ([5], p. 29). This is in stark contrast to the positivist view that the aim of science is the systematization of experience that exists independently of any scientific theories ([12], p. 178). This new view of scientific theories also involves a “radical” conception of the nature of theoretical change. Rejecting the positivist notion of any constant element (experience, observation language, etc.) through such change, Kuhn regards a basic theoretical change as a conceptual revolution and “wants to say that after a revolution scientists are responding to a different world” ([14], p. 110). Hanson uses the phrase ‘theory-loaded’ to give expression to a view of the semantic content of observation statements that follows from this general position ([11], pp. 19 ff.).

Adolf Grünbaum, [1], and Philip Quinn, [7], have proposed two problems as sharpened versions of theses suggested by Pierre Duhem. (1) Can an hypothesis which in itself has no observational consequences ever be falsified by the evidence ? (2) When a theory has observational consequences only in conjunction with auxiliary hypotheses and some of these consequences fail, can the theory always be reasonably defended by constructing alternative auxiliary hypotheses ?

Rom Harré's proposed Copernican Revolution in the philosophy of science is a very ambitious undertaking. It challenges established views, proposes a radically new model for scientific explanation, and forces a rethinking of the foundations of the field. In his treatment of the natural sciences, Harré rejects all deductivist accounts of scientific explanation (whether these accounts are fashioned by rationalists or empiricists) basically on the grounds that such accounts seriously distort the methods of explanation actually operative in science. In the social sciences Harré, in collaboration with Secord, rejects mechanistic, positivistic, and behavioristic accounts of human behavior [5]. In place of these discarded interpretations he substitutes a new realism which stresses the role that models play in supplying accounts of observed patterns of phenomena in terms of the things and processes whose interactions are responsible for the manifest phenomena. This revolution, if successfully carried out, would indeed be a valuable contribution to the philosophy of science.

By observing a black swan, one ascertains an interesting zoological fact. The fact involves two items, a specific object and the property of being a black swan, and consists in the former instantiating the latter. The object is in itself of little interest. Our environment abounds in objects, and knowledge is hardly enhanced by one of them being merely picked out for consideration. The same goes for the property. Properties are at least as plentiful as objects and one does not get to know anything by merely focussing attention upon one of them. What is of interest is the combination of the two items, i.e. the circumstance that the object instantiates the property. And this is what the said fact consists in.