> The Schlieffen plan developed by it's namesake general
The Schlieefen plan didn't exist.
> The Schlieffen memorandum of 1905, with its 1906 supplement, was not a plan. It was not operational. It did not go into details or issue orders
David Frmokin's Europe's Last Summer
Terence Zuber's Inventing the Schlieefen Plan shows that the "plan" was written in a memorandum at his retirement, which his daughter kept in her family photos (even in August 1914). The memorandum also involved 20 divisions which never existed - 48 corps should have attacked France instead of the actual 34...
The actual plan as described was a one front war against France... From Schlieefen's other writings were Germany at war with France and Russia, he suggested using interior rail lines to lure enemy forces inside, and then counteract by taking their supply lines (the move through Belgium and Northern France), quickly winning the war, which bears only the most superficial resemblance to the war as started.
Mark Humphries and John Maker have gone into more detail on where the actual war plan (as followed) came from, von Moltke's beliefs etc. Even e.g. Gross who has strongly debated Zuber about this agrees that there was no official plan as such, instead arguing that Schlieffen's influence, staff rides etc. planted the seeds of seeing potential victory through such an approach.