Discourse on the Method of Rightly Conducting the Reason in the Search for Truth in the Sciences
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The Discourse on the Method of Rightly Conducting the Reason in the Search for Truth in the Sciences was a work by René Descartes. It usually just called Descartes's Discourse on Method.

It introduced the Cartesian coordinate system.

The original article can be found at: http://en.wikipedia.org/wiki/Discourse_on_the_Method_of_Rightly_Conducting_the_Reason_in_the_Search_for_Truth_in_the_Sciences.
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