"He would put down on paper, very rough, these beautiful thumbnails and planned the best way he could do the scene," explains Sandro Cleuzo, animator on The Princess and the Frog, about his research on Milt Kahl.
I came across this post while researching for teaching 2nd year animators at SBIT about planning for their major animation project this year. I found it via a link from Alonso's blog.
Behind The Storyboards of The Princess And The Frog
Brad Bird talks about Milt Kahl.