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Fruits, Salads, and Smoothies: A Working Definition of Interdisciplinarity



Proposes a practical definition of "interdisciplinarity" that reduces some of the uncertainties surrounding the term and focuses on its essential attributes. Indicates that "interdisciplinarity," the uniting of distinctive components of two or more disciplines, involves interdisciplinary knowledge, research, or education as its main objects of study. (15 citations) (MAB)
Fruits, Salads, and Smoothies:
A Working Definition of Interdisciplinarity
[Publication Source and Acknowledgment: Journal of Educational Thought 29: 119-126 (1995)].
Send me an e-mail: Moti.Nissani@Wayne.Edu
Abstract: Interdisciplinarity involves bringing together distinctive components of two or more disciplines. In academic discourse, interdisciplinarity typically
applies to four realms: knowledge, research, education, and theory. Interdisciplinary knowledge involves familiarity with distinctive components of two or more
disciplines. Interdisciplinary research combines distinctive components of two or more disciplines in the search or creation of new knowledge, operational
procedures, or artistic expressions. Interdisciplinary education merges distinctive components of two or more disciplines in a single program of instruction.
Interdisciplinary theory takes interdisciplinary knowledge, research, or education as its main objects of study. At any given historical period, the interdisciplinary
richness of any two exemplars of knowledge, research, and education can be compared by weighing four variables: number of disciplines, the "distance" between
them, novelty, and integration.
Although many have tried to define interdisciplinarity (e.g., Berger, 1972; Huber, 1992; Kockelmans, 1979; Mayville, 1979; Stember, 1991), it still seems "to defy
definition" (Klein, 1990, p. 11). The most widely cited attempts break down interdisciplinarity into components such as multidisciplinarity, pluridisciplinarity,
crossdisciplinarity, transdisciplinarity, and even metadisciplinarity. But these subdivisions, it seems to me, throw little light on the theory and practice of interdisciplinarity,
in part because they try to grasp points along a fluid, multidimensional continuum (Blackwell, 1955). Moreover, because such definitions attempt to confer upon this
term a precision it does not possess, they run the risk of missing its essential nature. At any rate, I have often tried to use the prevailing definitions in conversations with
colleagues and students, with little success.
This brief note proposes a practical definition of interdisciplinarity which reduces some of the uncertainties surrounding this term and which focuses on its essential
attributes. In my experience as an interdisciplinarian and as a teacher of interdisciplinary theory, this definition serves as a better foundation in theoretical and practical
discussions of interdisciplinarity than anything that has so far been proposed in the English language. The definitional impasse which prevails now, I shall try to show, and
some of the difficulties it created in all theoretical analyses of interdisciplinarity, may be overcome by recognizing the fluidity of this concept on the one hand, and its
application to four realms on the other. Before we delve into the definition itself, two preliminary concepts must be characterized. First, a discipline can be conveniently
defined as any comparatively self-contained and isolated domain of human experience which possesses its own community of experts. Every discipline has its peculiar
constellation of distinctive components: such things as shared goals, concepts, facts, tacit skills (Polanyi, 1962), methodologies, personal experiences, values, and
aesthetic judgments. Thus, aesthetic judgments of sound combinations, theorems about whole numbers, and chess opening gambits, are, respectively, distinctive
components of music, mathematics, and chess.
Owing to the complex nature of any given discipline, in practical situations, these characterizations must be aided by current conventions, common sense, and intuition.
Also, these characterizations are time-dependent, e.g., today's discipline may well have been yesterday's subdiscipline; by the 21st century, some distinctive components
of contemporary educational research will be replaced by others.
For interdisciplinarity, I propose this minimalist definition: bringing together in some fashion distinctive components of two or more disciplines.
Four Interdisciplinary Realms
In academic discourse and practice, there are four realms to which the term "interdisciplinarity" is most commonly applied. Interdisciplinary knowledge involves
familiarity with distinctive components of two or more disciplines. Interdisciplinary knowledge is a necessary, but not sufficient, condition for interdisciplinary research:
combining distinctive components of two or more disciplines while searching or creating new knowledge, operational procedures, or artistic expressions.
Interdisciplinary education merges distinctive components of two or more disciplines in a single program of instruction. Interdisciplinary theory takes interdisciplinary
knowledge, research, or education as its main objects of study.
A few examples should make this quadripartite distinction clear. Bertrand Russell--at home in disciplines as far apart as philosophy, history, and mathematics--
exemplifies an advanced state of interdisciplinary knowledge. Other notable twentieth-century erudites are Karl Popper, Aldous Huxley, Isaac Asimov, and Arthur
Koestler. In previous centuries, erudition may have been more attainable, as witness the encyclopedic knowledge of Aristotle, Descartes, and Goethe.
In his time, Gregor Mendel's work with peas typifies interdisciplinary research (cf. Nissani, 1994). While teaching a rather narrowly circumscribed version of physics to
high school students, Mendel was also studying the transmission of characters from one generation of plants to the next. At one point--the watershed mark in his
research--he realized that the key to his biological observations was to be found in statistics. By combining his botanical data and simple laws of chance, he achieved a
major breakthrough.
Johannes Kepler's first law provides another well-known example of interdisciplinary research. For a long time Kepler tried to fit Mars' orbit about the sun into a circle.
The breakthrough in this case took place again at the moment when Kepler recognized that the points fell on an ellipse, not on a circle. That is, by combining
Apollonius's work on conic sections with Tycho Brahe's data on Mars, Kepler was able to come up with the first law of planetary motion (Koestler, 1959).
Certain subjects can be best taught through interdisciplinary education. For instance, industrialized societies need elementary school teachers, landscape planners,
materials researchers, and physicians whose jobs involve the bringing together of diverse disciplines. It is universally agreed, therefore, that their education must have a
strong interdisciplinary component.
On other occasions, the motivation for interdisciplinary education is different. One interdisciplinary undergraduate program, for instance, attempts to develop "a holistic
understanding informed by materials from various disciplines." Instructors in this program share the beliefs that most courses should draw "on the perspectives or world
views of more than one discipline" and that "incorporation or integration of disciplinary perspectives into a larger, more holistic perspective is the chief distinguishing
characteristic of interdisciplinarity studies" (Newell, 1992, pp. 212-3). Such a program might, for instance, discuss freedom sequentially from different disciplinary
angles, then integrate these angles into a meaningful whole (Newell, 1992). But regardless of motivation, interdisciplinary education combines distinctive disciplinary
components in a single course or program of instruction.
Interdisciplinary theorists study interdisciplinary knowledge, research, or education. They study such things as the psychological processes of integrating information
from two disciplines, roadblocks to meaningful communication between linguists and biologists, or the pros and cons of teaching science and literature in a single course.
An interdisciplinary theorist may or may not be an interdisciplinarian in the other senses described here--in the same manner that a philosopher of science may or may
not be a scientist. This manuscript, Klein's book (1990), and a 1992 issue (#3) of The European Journal of Education, exemplify interdisciplinary theory.
Criteria for Ranking Interdisciplinary Richness
I have suggested already a working definition of non-theoretical interdisciplinarity: the bringing together of distinctive components of two or more disciplines in a single
mind, research endeavor, or instructional program. However, this definition tells us little about the extent of interdisciplinarity in any given exemplar; that is, whether one
scholar, research endeavor, or educational program is more interdisciplinary than another. Among other things, such ranking may clarify the nature of interdisciplinarity
and resolve a long-standing controversy in interdisciplinary theory.
Because rankings in all three realms are based on similar criteria, I shall explore the interdisciplinary rankings of research activities in some detail first, and then merely
touch upon the rankings of knowledge and education. To rank the interdisciplinarity richness of any given research, we need to refine our definition by placing all
research along a fluid continuum, ranging from the two imaginary poles of pure disciplinary work to a grand synthesis of all human knowledge.
Experience suggests that this discussion can be best approached in a roundabout way, by means of a homely metaphor of mixing fruits. Let us fancy that we wish to
determine the amalgamation quotient of fruit mixtures. When an apple, an orange, or a strawberry is served alone, this quotient is obviously zero. But connoisseurs
sometimes wish to mingle fruits. One criteria in determining the amalgamation quotient of our particular dish would be the number of different fruits involved. A mixture
involving apples and oranges is less amalgamated than one involving apples, oranges, and plums. A second criterion would be distance: mixing Mackintosh and
Winesap apples would result in less amalgamation than the mixing of oranges and grapefruits, and still less than the mixing of oranges and cherries. Third, there is the
novelty of the mixture itself. In Western societies now, for instance, mixing bananas, apples, and grapes is not as creative, and unusual, as the mixing of guavas, kiwis,
and blueberries. Fourth, and perhaps most important, is the degree of blending or integration. The various fruits can be served side by side, they can be chopped up
and served as a fruit salad, or they can be finely blended so that the distinctive flavor of each is no longer recognizable, yielding instead the delectable experience of the
smoothie. Note that the amalgamation quotient says nothing about quality: in some circumstances, a plain mango will surpass all the smoothies in the world; in others,
only a fruit salad will do.
In a similar manner, at any given historical point, the interdisciplinary richness of any two exemplars of knowledge, research, and education can be compared by
weighing four variables: the number of disciplines involved, the "distance" between them, the novelty and creativity involved in combining the disciplinary elements, and
their degree of integration.
While the meanings of the first three criteria can be readily grasped from the illustrations below, a few words may be in order regarding the more important and complex
criterion of integration. In explicating this concept, I shall closely follow Roland Case's (1991) excellent treatment. By "integration" we mean uniting or meshing discrete
elements. Integration can be partial, as, for example, when parallels are drawn between elements which remain separate; or complete, as, for example, when separate
elements are fused into a single entity. To be meaningful, integration must satisfy the condition of coherence: the blending of elements is not random, but helps to endow
our knowledge, research, or instruction with meaningful interconnections and greater unity.
I shall now illustrate the reasonableness and utility of the foregoing discussion by applying it to a few concrete research programs.
The interdisciplinary extent of the labors of a contemporary astronomer tracing the path of a newly discovered asteroid is comparatively low, although even her efforts
are influenced and informed by a variety of disciplines. For instance, she may be employing optical instruments (optics); she must take into account atmospheric
conditions (climatology); and her labors may be motivated by the desire to know the potential consequences of a future collision between earth and an asteroid
(ecology, politics, etc). All the same, our four criteria suggest that her research can be safely placed near the disciplinary pole of the interdisciplinarity continuum. The
number of disciplines here is small, they are for the most part related, their merging in a study of this particular problem is by now fairly routine, and the discrete
disciplinary components used here can be hardly said to fuse into a single whole.
In the 1950s, morphological descriptions of a single human ulcer ranked even lower in interdisciplinary extent. Such descriptions involved fewer and closer disciplines,
hardly any creative combinations, and little integration. By contrast, one might imagine, the re-discovery of the link between psychological stress and stomach ulcers fell
farther along the interdisciplinary continuum. Here, insights from the two traditionally distinct disciplines of psychology and physiology were involved. The two disciplines
were only occasionally brought together before (e.g., Galen in Moulton and Schifferes, 1945), so the merging of relevant concepts from both required insight. In this
case, too, the effort led to the blending of two concepts: thanks to this research, the term "stomach ulcers" evokes in the modern mind both the physiological symptoms
and their frequent psychological causation.
Compare Mendel to a modern geneticist who routinely carries out statistical tests of significance. The research program in either case involves the same two disciplines
of biology and statistics. Today, the merging of the two for the purpose of testing significance is a routine operation but in 1860 the two were rarely combined. So,
judging by the second criterion of distance, Mendel's work was richer in interdisciplinary content. It was richer by the third criterion as well, for it takes little imagination
to carry out a test of significance today, but in Mendel's time it took uncanny insight to see that some laws of chance applied to inheritance in peas. Finally, both research
programs appear equally integrative, as both assume, for instance, randomness as one essential attribute of living entities.
As a final example, compare the chromosome theory of inheritance (Carlson, 1966) to Torricelli's sea of air hypothesis (Conant, 1951). In both cases, the work was
carried out within subdisciplines of a larger discipline (biology in one case, physics in the other). The number of subdisciplines and the perceived distance between them
in both cases is roughly the same: genetics and cytology on the one hand, hydrostatics and aerostatics on the other. It is difficult to rank creativity, but it seems that both
cases call for a similar imaginative leap, since neither pair was often brought together. The extent of integration, on the other hand, seems greater in the biological case
than in the physical one. In physics, the recognition of similarity between pressure under water and on land served for the most part as a heuristic device: it did not lead
to a permanent integration of two subfields or concepts. In biology, the juxtaposition of chromosomes and genes altered and enriched the two original subdisciplines. It
also led to the establishment of a new borderline subdiscipline, cytogenetics, which is devoted to investigating problems that concern both its parent subdisciplines. And,
as a result of this work, key definitions in both subdisciplines changed. By 1920 at the latest, a gene for a geneticist became "a factor of heredity located on the
chromosome," while a chromosome for a cytologist became "a nuclear organelle which embodies the factors of heredity." It follows that the chromosome theory was
richer in interdisciplinary content than the sea of air hypothesis.
Scholars may again be ranked along the same fluid, four-dimensional continuum. One might be concerned primarily with one's own discipline; one might occasionally
incorporate in one's work or teaching some limited insights or methodologies from another field; or one might be a true Renaissance Scholar, not only at home in a
number of areas in the arts, sciences, and humanities, but in a position to meaningfully integrate them in one's mind, research, or teaching. A similar distinction holds for
education, ranging from strict (and imaginary) disciplinary instruction to the novel, comprehensive (and equally imaginary) integration of all disciplines in a single
instructional session.
Finally, interdisciplinary rankings tell us little about quality or fruitfulness: in either scholarship, research, or education, excellence and second-ratedness can be found
anywhere along the interdisciplinary continuum.
Acknowledgements: I am grateful to Shreedhar Lohani for having first aroused my interest in interdisciplinary theory. As always, my wife Donna provided research
assistance and a loving working atmosphere. My colleagues, especially Julie Thompson Klein and Clifford Maier, encouraged me to teach The Case for
Interdisciplinarity; without their support, this note would have never been written. I am particularly indebted to Donna, Julie, and two anonymous referees for a critical
reading, and to my students for prompting me to refine my conception of interdisciplinarity.
Berger, G. (1972). Opinions and facts. In Centre for Educational Research and Innovation, Interdisciplinarity (pp. 21-74). Nice, France: OECD.
Blackwell, G. W. (1955). Multidisciplinary team research. Social Forces 33, 367-374.
Carlson, E. A. (1966). The gene: A critical history. Philadelphia: Saunders.
Case, R. (1991). The anatomy of curricular integration. Canadian Journal of Education, 16, 215-224.
Conant, J. B. (1951) Science and common sense. New Haven, Yale, pp. 63-96.
Galen. The Lady and the Dancer. Reprinted in: F. R. Moulton & J. J. Schifferes (1945) (Eds.). The autobiography of science. New York: Doubleday, pp. 30-31.
Huber, L. (1992). Editorial. European Journal of Education, 27 (3), 193-199.
Klein, J. T. (1990). Interdisciplinarity. Detroit: Wayne State University.
Koestler, A. (1959). The sleepwalkers. New York: Macmillan.
Kockelmans, J. J. (1979). Why interdisciplinarity? In J. J. Kockelmans (Ed.), Interdisciplinarity and higher education (pp. 123-160). University Park: Pennsylvania
State University.
Mayville, W. V. (1978). Interdisciplinarity: the mutable paradigm. Washington, D.C.: American Association for Higher Education.
Newell, W. (1992). Academic disciplines and undergraduate interdisciplinary education: Lessons from the School of Interdisciplinary Studies at Miami University, Ohio.
European Journal of Education, 27 (3), 211-221.
Nissani, M. (1994). Psychological, historical, and ethical reflections on the Mendelian Paradox. Perspectives in Biology and Medicine, 37 (#2), 343-352.
Polanyi, M. (1962). Personal knowledge. Chicago: University of Chicago.
Stember, M. (1991). Advancing the social sciences through the interdisciplinary enterprise. The Social Science Journal, 28, 1-14.
Go to Moti Nissani's Homepage
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... (Adapted from Nissani 1995) Figure 1: A blended fruit metaphor originally used by Nissani (1995) to define interdisciplinarity was adapted and extended by the committee to reflect the emphasis that "convergence research" places on solving complex societal problems. Graphic developed by Brit Myers, ARCUS. ...
... (Adapted from Nissani 1995) Figure 1: A blended fruit metaphor originally used by Nissani (1995) to define interdisciplinarity was adapted and extended by the committee to reflect the emphasis that "convergence research" places on solving complex societal problems. Graphic developed by Brit Myers, ARCUS. ...
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Questions addressed: How much disciplinary background is necessary for IDS courses? How much is needed to develop/teach ID courses? How visible should disciplines be and what role should they play in IDS courses? Can students learn intellectual skills such as rigor and critical thinking through IDS courses? Can IDS courses prepare them for advanced work in disciplines or discipline-based careers?
Although interdisciplinary work in universities has expanded in recent decades, the influence of academic disciplines is pervasive. The article makes explicit the opportunities and challenges of interdisciplinary for the social sciences. The strategies offered for enhancing the interdisciplinary enterprise include selecting appropriate group members, establishing ground rules, explicating and bridging epistemological and methodological differences, and promoting infrastructural support.
A school's curriculum can appear unrelated, fragmented, or somewhat disjointed if not done with an end in mind. This fragmentation or disjointedness often affects students and their views of the experiences being given them in school. Various curriculum-integration techniques, however, can be used to help make the big picture more understandable to students; and these have the added benefit of allowing teachers to focus better on teaching and student learning. In effective curriculum-integration models, knowledge is meaningfully related and connects in such a way that it is relevant to other areas of learning as well as real life. Of course, sometimes integration is not the best approach to teaching. Integration just for the sake of integration can interfere with learning if constructed activities are not meaningful. To integrate a curriculum is to combine subjects to meet objectives across the curriculum, not just objectives pertaining to one subject. Thus, in this article, the author states that to make integration meaningful and successful in a classroom, activities must be assessed by their educational value and meet curricular objectives in two or more subject areas. When implemented properly, not superficially, integration can be a more meaningful approach to learning for students, as well as a time-saver for teachers.
The gene: A critical history
  • E A Carlson
Carlson, E. A. (1966). The gene: A critical history. Philadelphia: Saunders.
  • L Huber
Huber, L. (1992). Editorial. European Journal of Education, 27 (3), 193-199.