ELECTRONIC	h   t   t   p   c o l o n   s l a s h   s l a s h   w   w   w dot s y s t e m s t h i n k i n g dot o r g   s l a s h   d i k w   s l a s h   d i k w dot h t m v a n	http://www.systemsthinking.org/dikw/dikw.htmvan	1