Full Idea
The computational/representational theory of thought has given a good account of deduction, but mechanical theories of induction, abduction and practical reason are needed in order to make a machine which could reason.
Clarification
'Abduction' is inference to the best explanation
Gist of Idea
CRTT is good on deduction, but not so hot on induction, abduction and practical reason
Source
Georges Rey (Contemporary Philosophy of Mind [1997], 8.5)
Book Reference
Rey,Georges: 'Contemporary Philosophy of Mind' [Blackwell 1997], p.218
A Reaction
This is the best analysis of rationality that I have found (four components: deduction, induction, abduction, practical reason). I can think of nothing to add, and certainly none of these should be omitted.