(ref.doc)ACM-0994

Communications of the ACM
September 94, Volume 37 Number 9
Object-Oriented Software Testing

p 17 Viewpoint
Intuitive equals familiar
by Jef Raskin (Apple Macintosh and Canon Cat)
  "The mouse is not intuitive."
  "If superior, it cannot be the same, so it must be different
  (typically, the greater the improvement, the greater the
  difference). Therefore, it cannot be intuitive, that is, familiar."
  "User satisfaction, (early) productivity, and familiarity are not
  orthogonal"

p 102 Cryptography
To Decode Short Cryptograms
by George W. Hart
  135 most frequent words in American English, with a 50% hit
  probability when picking up a word at random.