How did Leonardo Vinci viewed drawing as a part of the creative process.

Answer 1

In http://en.wikipedia.org/wiki/Leonardo_da_Vinci be sure to read this paragraph:
"The daring display of figure composition, the landscape elements and personal drama also appear in the great unfinished masterpiece, the Adoration of the Magi, a commission from the Monks of San Donato a Scopeto. It is a very complex composition about 250 square centimetres. Leonardo did numerous drawings and preparatory studies, including a detailed one in linear perspective of the ruined classical architecture which makes part of the backdrop to the scene. But in 1482 Leonardo went off to Milan at the behest of Lorenzo de’ Medici in order to win favour with Ludovico il Moro and the painting was abandoned."

Actually, you should read the entire article AND read many (if not all) of the articles linked in External Links at the bottom of the Wikipedia page.

Answer 2

Descrbe how each artist viewed drawing as a part of the creative process.