Critical thinking: several definitions

Critical Thinking 
2nd Ed. Cover

An original purpose of Hodges' model was to facilitate reflection, and so help to develop practitioners who were also competent reflective practitioners, and critical thinkers.

Continuing to clear books, I've arrived at:

Fisher, A. (2001) Critical Thinking: An Introduction. Cambridge University Press, Cambridge, England. PB. 

Now in a 2nd edition (2011), my copy has several definitions of 'critical thinking' quoted below, with my emphasis.

There is a pdf of this 1st edition online which may be useful. The reward of the book, however, is in the discussion about each definition and how more recent work has built upon Dewey's legacy.  There is also a baseball analogy, which I will return to soon, or append here. I have omitted a definition by Richard Paul, which is nonetheless important to me, as it draws on meta-cognitive qualities:

"1.1.1 John Dewey and 'reflective thinking' ...

In fact, people have been thinking about critical thinking and have been researching how to teach it for about a hundred years In a way, Socrates began this approach to learning over 2,000 years ago, but John Dewey, the American philosopher, psychologist and educator, is widely regarded as the 'father' of the modern critical thinking tradition. He called it 'reflective thinking' and defined it as: 

"Active, persistent, and careful consideration of a belief or supposed form of knowledge in the light of the grounds which support it and the further conclusions to which it tends. (Dewey, 1909, p. 9)."' p.2.

 'Glaser defined critical thinking as:

(1) an attitude of being disposed to consider in a thoughtful way problems and subjects that come within range of one's experience; (2) knowledge of the methods of logical enquiry and reasoning; and (3) some skill in applying those methods. Critical thinking calls for a persistent effort to examine any belief or supposed form of knowledge in the light of the evidence that supports it and the further conclusions to which it tends. (Glaser, 1941, p.5).' p.3.

1.1.3 Robert Ennis - a widely used definition ...

'Critical thinking is reasonable, reflective thinking that is focused on deciding what to believe or do. (Cf. Norris and Ennis, 1989).' p.4.

Notice the emphasis on being 'reasonable' and 'reflective', which picks up on earlier definitions, but notice also that Ennis speaks of 'deciding what to do', which was not explicitly mentioned earlier; so decision making is part of critical thinking in Ennis's conception. Unlike Dewey's definition, this definition needs no further explanation

A final definition of critical thinking 

One last definition is worth reviewing. Michael Scriven has recently argued that critical thinking is 'an academic competency akin to defines it thus: reading and writing' and is of similarly fundamental importance. He defines it thus:

'Critical thinking is skilled and active interpretation and evaluation of observations and communications, information and argumentation. (Fisher and Scriven, 1997, p. 21).' p.10."