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  Tacit knowledge and
Implicit learning

Tacit (silent) knowledge (Polanyi, 1958) and implicit learning (see Berry [ed.] 1997) have in common the idea of not knowing what you do know or have learned. "Tacit knowledge" has been all but hi-jacked by management gurus, who use it to refer to the stock of expertise within an organization which is not written down or even formally expressed, but may nevertheless be essential to its effective operation. This is a seriously big issue in large organizations in particular: I have to draw the line somewhere on this site, but see the work of Nomamura, and Senger.
Originally, Polanyi's interest was in the kind of knowledge which we routinely use and take for granted, such as the ability to recognize the face of a friend: it is irreducible to explicit propositional knowledge and cannot be articulated. It cannot therefore be taught, although of course there is obvious evidence that it can be learned or acquired. It may therefore (and here I wander away from the formal theory) be associated with Gestalt understanding, and procedurally — in the form of "know-how" — with a "knack" for doing something.

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All that one can do to "teach" such knowledge is to provide opportunities for people to learn it, perhaps through exposure to examples: there is nevertheless a qualitative leap between individual examples of either propositional knowledge or practical skill, and the ability to integrate them into something which is "more than the sum of its parts". The distinction is similar to that between Bateson's Learning I and Learning II. Ideas of situational learning similarly suggest that it is most effectively "picked up" in real world situations, and that attempts to reduce it to standard teachable forms are in danger of distorting or destroying it (Becker, 1963)

Implicit Learning

If tacit knowledge is about the content of what is learned, implicit learning is about the process, and it remains a contentious debate in psychology. A typical experiment in the field is to expose subjects to strings of letters which are governed by orderly rules (or a "grammar"), such as DEFKLM and JKLPQR, and others which are not: the subjects are not expected to try to articulate the rules. The subjects are later shown further sets of letters and asked to say which are "grammatical" and which not: they tend to be able to distinguish between them without knowing quite how they do it (Reber, 1967). This is taken as evidence that they have "unconsciously" learned a rule: not only can they not specify the rule, but they do not even know that they have learned a rule.

This is perhaps not surprising: it applies after all to all the forms of non-human learning which have ever been studied. But is it just a matter of picking up individual "tricks" or may more complex and coherent learning be taking place unconsciously? My impression in reading the literature is that much of the research is limited by its methodology: the tendency of subjects to try to find ways to explain or rationalise the discovery that they have learned something, when they don't know how it happened, is likely for ever to undermine attempts to find interesting real-world examples.

However, in learning in the professions in particular, the process of acquiring the "know-how" of the mature practitioner is still little understood, and its relationship with formal training remains problematic. Berry (1997) reports that in one of her experiments:

    "It was found that in both cases, practice significantly improved ability to control the tasks, but had no effect on ability to answer post-task, written questions. In contrast, verbal instructions about the best way to control the tasks had no significant effect on control performance, although they did make people significantly better at answering the questions. [...] these basic findings have been replicated and extended in a number of follow-on studies [...] (Berry 1997:2)

It is still not clear where this area of research is leading, but it may well be particularly important for educational practice in the future. The quotation certainly poses some interesting questions about skill development (in teaching, for example), and the relevance or otherwise of the ability to talk about it!

See also the "progression of competence" model.

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