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Page last edited on 12 March, 2003

What makes good reasoning?

Often the thing that comes to mind when we think about reasoning is logic. Logic has many systems generally stemming from the Greek philosopher Aristotle. We can talk of categorical or propositional or predicate logic. Here are some typical examples

of categorical logic:

All A's are B's and all B's are C's - Therefore all A's are C's

Some A are B. No B are C. - Therefore some A are not C.

of propostional logic:

If there is an F on the sheet of paper there is an L. If there is not an L on the paper there is a V. Therefore there is an F or there is a V.

Predicate logic combines these two and as we get deeper into the study of the logical use of language we come to semantics where we are no longer explaining the use of language but the meanings of words become restricted by limiting their use to meanings consistent formal definitions.

This type of reasoning, which I will call 'formal' logic, is only concerned with reaching conclusions with certainty from certain accepted statements. It is not nearly enough to describe the process of reflection because most evidence we get is not absolutely certain. To think logically in such a way that you follow the formal logical constructs mentioned here would also not be enough because it doesn't cover the search process. Good thinking is as much about finding the evidence in the first place as it is about deriving conclusions from it.

All of scientific knowledge is based on reasoning from imperfect knowledge; indeed none of what we know is 100% certain. We have to deal with probabilities and hypotheses. This gets close to a related issue, which is whether we can ever be confident that any statement we make about reality is absolutely true. We cannot. - Human knowledge is inherently imperfect and formal logic doesn't consider this.

Our 'beliefs' are generally formed by hypothesis testing and on the balance of probabilities. This can become subject to more rigorous tests than simple guidelines for good thinking in a search process. Sometimes a judgement on the balance of probabilities is clearly dependent on definite factual observations that frequency determines the probability or that the events are logically exchangeable. (e.g. tossing a coin and getting heads or getting tails). However, often judgement of the weight given to individual items of evidence may be a matter of personal opinion or choice. This latter situation is the case in most everyday situations; we justify our probability judgements based on the weight we give to certain pieces of evidence.

Whether this aspect of thinking is good or bad is dependent on a number of ways that our reasoning can go astray.

Continue to ...

Sub-topics in this Chapter

02a - What is 'good thinking'? What is 'bad thinking'?
02b - How can rationality be defined?
02c - Some examples of aspects of good thinking
02d - What makes a good search?
02e - What makes a bad search?
02f - What makes good reasoning?
02g - What makes bad reasoning?
02h - In what ways can probabilistic reasoning be bad?
02i - Thinking about Morals
02j - The Ultimate
02k - The Design Argument
02l - Ultimate explanations
02m - Revelations
02n - The nature of signs of revelation
02o - The general concept pf sin in Islam
02p - Problems with Christianity

Main Chapters
01-  The Basis of Knowledge ] 02 - The Sin of Disbelief ] 03 - The Amazing Quran ] 04 - The Teachings of Islam ] Table of Contents ]


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Last updated on 12 March, 2003

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Hate Hurts. Love Cures. Conjecture Fails. Truth Prevails.
Islam - Bearing witness to the Truth
Seek Understanding from Knowledge/ Information
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