A quick Step by step by the creator, Hans Weilenmann, can be found on Danica.com.
HOOK: Grip 11011BL
BODY: CDC Feather
WING: Elk or Deer hair
A variation on the theme is this darker version that has some dyed Squirrel tail fibers added to the Elk hair, as well as a Florescent red antron post to spot it better on the water. The squirrel fibers gives it lots of added movement on the water and lately this darker fly has become my go to pattern when looking for something to tie on.