Skills involved in critical thinking
(Wade and Tavris 1990)

Skills
Simple Techniques
1. Ask questions: be willing to wonder.
Start by asking "Why?"
2. Define the problem.
Restate the issue several different ways so it is clear.
3. Examine the evidence.
Ask what evidence supports of refutes the claim.  Is it reliable?
4. Analyze assumptions and biases.
List the evidence on which each part of the argument is based.  The assumptions and biases will [then] be unsupported [by evidence] and [thus] should be eliminated from further consideration.
5. Avoid emotional reasoning.
Identify emotional influence and "gut feelings" in the arguments and exclude them.
6. Don't oversimplify.
Do not allow generalization from too little evidence.
7. Consider other interpretations.
Make sure alternate views are included in the discussion.
8. Tolerate uncertainty.
Be ready to [provisionally] accept tentative answers when evidence is incomplete [i.e. most of the time], and new answers when further evidence warrants them.

Rules for evidential reasoning
(Lett 1990, Lipps 1999)


Rules for evidential reasoning.
What to do
1. Falsifiability Conceive of all evidence that would prove the false claim.
2. Logic
Argument must be sound
3. Comprehensiveness
Must use all available evidence
4. Honesty
Evaluate evidence without self-deception.
5. Replicability
Evidence must be repeatable
6. Sufficiency
A. Burden of proof rests on the the claimant.
B. Extraordinary claims require extraordinary evidence
C. Authority and/or testimony is always inadequate


References:

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modified 1-11-05