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→Cartesian doubt (René Descartes)
[[Image:Gtr7564.jpg|200px|right|thumb|[[Rene Descartes]] ]]
[[Image:Gtr7564.jpg|200px|right|thumb|[[Rene Descartes]] ]]
* (1) accept as true only what can be proven
* (1) accept as true only what can be proven
* (2) solve problems in a systematic manner, part-by-part
* (2) [[Problem solving|solve problems]] in a systematic manner, part-by-part.
* (3) proceed from simple to more complex issues
* (3) proceed from simple to more complex issues
* (4) finally, review everything completely to ensure that nothing was left out
* (4) finally, review everything completely to ensure that nothing was left out