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Descriptive Knowledge
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Descriptive Knowledge, also declarative knowledge or propositional knowledge, is the type
of knowledge that is, by its very nature, expressed in declarative sentences or indicative
propositions. This distinguishes descriptive knowledge from what is commonly known as
"know-how", or procedural knowledge (the knowledge of how, and especially how best, to
perform some task), and "knowing of", or knowledge by acquaintance (the knowledge of
something's existence).
The difference between knowledge and beliefs is as follows: A belief is an internal thought or
memory which exists in one's mind. Most people accept that for a belief to be knowledge it
must be, at least, true and justified. The Gettier problem in philosophy is the question of
whether there are any other requirements before a belief can be accepted as knowledge.
The article epistemology discusses the opinion of philosophers on how one can tell which
beliefs constitute actual knowledge.
Acquiring knowledge
People have used many methods to try to gain knowledge.
By participation.
By acquisition.
By reason and logic (perhaps in cooperation with others, using logical argument).
By mathematical proof.
By the scientific method.
By the trial and error method.
By applying an algorithm.
By learning from experience.
By intuition (getting them from the subconscious).
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By an argument from authority, which could be from religious, literary, political,
philosophical or scientific authorities.
By listening to the testimony of witnesses.
By observing the world in its "natural state"; seeing how the world operates without
performing any experiments.
By acquiring knowledge that is embedded in one's language, culture, or traditions.
By dialogical enquiry (conversation). See Gadamer, Bohm, Habermas, Freire, on dialogue,
learning and knowledge acquisition/negotiation: http://www.infed.org/biblio/b-dialog.htm
By some claimed form of enlightenment following a period of meditation. (For example, the
Buddhist enlightenment known as bodhi)
By some claimed form of divine illumination, prayer or revelation from a divine agency.
Types of knowledge
Knowledge can be classified upon a priori knowledge, which is obtained without needing to
observe the world, and a posteriori or empirical knowledge, which is only obtained after
observing the world or interacting with it in some way.
Often knowledge is gained by combining or extending other knowledge in various ways.
Isaac Newton famously wrote: "If I have seen further... it is by standing on the shoulders of
giants".
Inferential knowledge is based on reasoning from facts or from other inferential knowledge
such as a theory. Such knowledge may or may not be verifiable by observation or testing. The
distinction between factual knowledge and inferential knowledge has been explored by the
discipline of general semantics.
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Knowledge in various disciplines
There are many different disciplines that generate beliefs that can be regarded as knowledge.
They include science (which generates scientific theories), law (which generates verdicts),
history (which generates historical narratives), and mathematics (which generates proofs).
Knowledge in science and engineering
Scientists attempt to gain knowledge through the scientific method. In this method, scientists
start by finding a phenomenon of interest, which generates questions. A scientist then picks a
question of interest, and based on previous knowledge, develops a hypothesis. The scientist
then designs a controlled experiment which will allow him to test the hypothesis against the
real world. He then makes predictions about the outcome of the test, based on the hypothesis.
At this point, the scientist carries out the experiment and compares his predictions with his
observations. Assuming that there were no flaws in the experiment, if the observations match
the predictions, this is evidence in favour of the hypothesis. If they do not match, then the
hypothesis has been falsified.
A hypothesis that has been shown to accurately and reliably predict and characterize some
physical phenomenon, and has been sufficiently tested, may become a scientific theory.
Scientific theories are widely regarded as knowledge, and they are always subject to further
revision or review should new data come to light.
To use scientific theories, they must be applied to the specific situation in hand. For example,
a civil engineer might use the theory of statics (a branch of physics) to determine whether a
bridge will hold up. This is one case where new knowledge is generated from scientific
knowledge by specializing it to an individual instance.
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The nature of human reasoning dictates that even a sound piece of scientific work might be
regarded as incorrect by the scientific community at large. This is exemplified by Dan
Shechtman's discovery in solid states for which he was criticised for some time.
Knowledge in history
The scientific method is essentially the application of the inductive approach to investigation.
This approach is entirely appropriate for exploration of the causal world of nature (physics,
chemistry, etc.) but not valid for the teleological social sciences, which includes history.
There are no constants in human relations,[citation needed] only unmeasurable and inconstant
subjective valuations. Electrons always behave the same way under the same conditions, but
humans do not—different people seem to react differently and the same person seems to or
might react differently at different moments in time. Thus, it appears that only spurious
inferences can be drawn from repeated observations of human behavior. It might be observed
that most humans prefer wealth to poverty or life to death, but it might be invalid to infer any
universal law of human behavior from this.
Historians often generate different interpretations of the same event, even when reading the
same primary sources, and these interpretations are always subject to revision by other
historians. This is because, as a social scientist, the historian must constantly make subjective
judgements of relevance in trying to interpret historical events.
Situated knowledge
From Knowledge.
Situated knowledge is knowledge specific to a particular situation. Imagine two very similar
breeds of mushroom, which grow on either side of a mountain, one nutritious, one poisonous.
Relying on knowledge from one side of an ecological boundary, after crossing to the other,
may lead to starving rather than eating perfectly healthy food near at hand, or to poisoning
oneself by mistake.
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Some methods of generating knowledge, such as trial and error, or learning from experience,
tend to create highly situational knowledge. One of the main benefits of the scientific method
is that the theories it generates are much less situational than knowledge gained by other
methods.
Situational knowledge is often embedded in language, culture, or traditions. Critics of
cultural imperialism argue that the rise of a global monoculture causes a loss of local
knowledge.
Issues
What constitutes knowledge, certainty and truth are controversial issues. These issues are
debated by philosophers, social scientists, and historians. Ludwig Wittgenstein wrote "On
Certainty" – aphorisms on these concepts – exploring relationships between knowledge and
certainty. A thread of his concern has become an entire field, the philosophy of action.
A number of problems exist, that arise when defining knowledge or truth, including issues
with objectivity, adequacy and limits to justification. Beliefs are also very problematic not
least because they are either true or false, and therefore cannot be adequately described by
conventional logic. An action likewise can be taken or not, but there is the troubling idea of
an "event" is, an action taken by nobody, or nobody whom one can blame.
Non-scientific methods
Several groups, most notably the postmodernists and social constructivists, hold that science
does not actually tell us about the physical world in which they live. They hold that the world
cannot be understood by science, but rather by religious revelations, mystical experience, or
literary deconstructionism.
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Practical limits for obtaining knowledge
What we hold to be knowledge is often derived by a combination of reason from either
traditional, authoritative, or scientific sources. Many times such knowledge is not verifiable;
sometimes the process of testing is prohibitively dangerous or expensive. For instance, some
physics theories about the nature of the universe, such as string-theory, require the
construction of testing equipment currently beyond our technology. Since such theories are in
principle subject to verification or refutation, they are scientific; since they are not proven
experimentally, they are not considered certain knowledge. Rather, in such cases we have
certain knowledge only of the theory, but not of what the theory describes.
"Of the three ways in which men think that they acquire knowledge of things—authority,
reasoning, and experience—only the last is effective and able to bring peace to the intellect."
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