This editorial by SiFu/SiGung Keith R. Kernspecht was published February 5th 2014, and brings a preview from a chapter in his new book.
This subject crops up again and again in classes and seminars. And as it is of essential importance for an understanding of our WingTsun, and consequently how we teach it, I have set the case out for everybody to read in my "Course book: Internal WingTsun" which will be published shortly (in German first).
Read the full article (PDF): Self-defence has little to do with martial sports _ WingTsun-World – The Magazine of the EWTO
or at the EWTO official website.