The Application of the Pinan / Heian Katas (Repost)

The Pinan / Heian series are often the first katas taught in the majority of modern dojos. This can lead to the Pinan / Heian katas being thought of as nothing more than introductory katas that are really only suitable for children and junior grades. However, it is my belief that the Pinan / Heian katas are grossly undervalued and do in act represent a coherent fighting system.