^^^Does that not answer a question which hasn't been asked? That is "how should you practice for optimal development" as opposed to the original contention that "Practicing your strengths is more important than working on your flaws"?
On a side not, was Vygotski's ZPD theory based on cognitive development in children?
I tweet - @ashtennis guru (no spaces)
I Shoot - www.flickr.com/photos/ashtennis guru/ (again no spaces! grrr)