Thinking, Method, Ordinality

Arriving at Cogito, Descartes goes no further to clarify the concept of Thinking, other than to list, questionably, as has been argued, some of its species, e. g. Willing.  However, if his own efforts are any evidence, Thinking can be conceived as an esentially Methodical process, and, hence, as one entailing Ordinality.  Accordingly, he can be interpreted as a forerunner of both Spinoza and Kant, for whom Thinking consists in ordered Extending, and Objective ordering, respectively.  In his own case, this concept of Thinking is more appropriate to his self-evidently actual process of Writing, than to his described sedentary meditating.