The 4 scales are:
(E) Ease of Use: How easy a trick is to execute with practice. A trick that is hard to learn but becomes fairly routine after repeated successes will receive a high rating, while a trick that cannot really be learned, or a trick which requires some luck to complete, will receive a low rating.
(T) Time Saved by Completing Trick: Obviously, a rating of 1 signifies a trick which is of little advantage to use, while a "10" trick saves a huge amount of time.
( S ) Surprise Factor: The best trick is the one that nobody else knows about. Is the trick common knowledge, or is it relatively obscure? The higher the rating, the more obscure the trick, and therefore, the greater the surprise.
(O) Overall Ranking: Takes into account the other 3 rankings for an overall measure of a trick's worthiness.