This paper undertakes a theoretical investigation of the “learning” aspect of science as opposed to the “knowledge” aspect. The practical background of the paper is in agricultural systems research – an area of science that can be characterised as “systemic” because it is involved in the development of its own subject area, agriculture. And the practical purpose of the theoretical investigation is to contribute to a more adequate understanding of science in such areas, which can form a basis for developing and evaluating systemic research methods, and for determining appropriate criteria of scientific quality. Two main perspectives on science as a learning process are explored: research as the learning process of a cognitive system, and science as a social, communicational system. A simple model of a cognitive system is suggested, which integrates both semiotic and cybernetic aspects, as well as a model of self-reflective learning in research, which entails moving from an inside “actor” stance to an outside “observer” stance, and back. This leads to a view of scientific knowledge as inherently contextual and to the suggestion of reflexive objectivity and relevance as two related key criteria of good science.

Key words: Agriculture, cognition, communication, experiential, learning, research, science, self-reflective, systemic

Natural systems cannot be closed to the environment. At the same time there is a necessity for closure in order to build the system. It is this quintessential tension between openness and closure that drives systems to unfold into further stages or levels of growth and development. In other words, the emergence of organization in natural systems is a result of cycles of openness and closure. There are two distinct and complementary ways by which a system will carry over closure while involved in a process of expansion across the environment. These two ways need to be expressed in any formal representation: (1) within a level this will be by means of transitive closure, which is additive; and (2) between levels (i.e., from one level to the next higher level) this requires algebraic closure, which is multiplicative. The former expresses space closure, whereas the latter expresses topological or time closure. The conjunction of these two closures generates a hierarchy of levels. Prior to, and outside of, the system lies semantic closure.

Although constructivism is a concept that has been embraced my many teachers over the past 1 5 years, the meanings that are attached to this term are varied and often inadequately understood. Teachers need to have a sound understanding of what constructivism means to evaluate its promise and to use it knowledgeably and effectively This paper explicates some of the theoretical background of constructivism and then presents a detailed example in which a traditional classroom lesson and a constructivist version of the same lesson are described and analyzed. Also discussed are pervasive myths and important instructional issues of this widely advocated and increasingly popular philosophical framework for teaching across the entire K-12 curriculum.

Excerpt: As a young man worrying about the fundamental questions of philosophy, metaphysics, and epistemology, McCulloch set himself the goal of developing an “experimental epistemology”: how can one really understand the mind in terms of the brain? More particularly, he sought to discover “A Logical Calculus Immanent in Nervous Activity.” The present paper will seek to provide some sense of McCulloch’s search for the logic of the nervous system, but will also show that his papers contain contributions to experimental epistemology which provide great insight into the mechanisms of nervous system function without fitting into the mold of a logical calculus. Moreover, McCulloch was not only a scientist but also a storyteller, poet, and memorable “character. ” I will thus interleave a number of characteristic anecdotes into the more objective attempts at scientific history that follow.

What is the main characteristic of constructive explanation? In other words, what is the nature of a construct and, consequently, what kind of relationship is there between constructs and behavior? Kelly stated that a “psychological response is initially and basically the outcome of a construing act." (1955) Somewhere else, he asserts it more clearly: “Since they construe them differently, they will anticipate them differently and will behave differently as a consequence of their anticipations.” (Kelly, 1963, p. 90) The relationship between constructs and “psychological response” could be considered in terms of either “causation” or “implication." Relevance: This paper deals with the relation between constructs and words in George Kelly’s personal construct psychology.

The momentum of the constructivist movement has had a profound effect on how prospective teachers are educated and on how they perceive the duties of a teacher, according to Mr. Baines and Mr. Stanley, who argue that students deserve a chance to learn at the elbow of an expert

Key words: journalism

Radical constructivism accentuates the subjectivity of constructions of reality and thus refutes the possibility of insights gamed by independent observers. In the context, constructivistic didactics hold out the prospect of a modelling of subject-oriented worlds of learning in the course of a corresponding averting of linear-causal models. The author examines constructivistically oriented didactic concepts as a result of pedagogical strategies of gratification with the help of which radical queries can be smoothed out and fitted into current debates on reform.