What Method to Use to Consult the Oracle
I have used yarrow sticks (shish kibab skewers work great) and coins. Master Alfred Huang suggests that one may use yarrow sticks to help in achieving your meditative state in consulting the oracle. Because this can take a long time, he has shown abbreviated ways of using the yarrow sticks. Fulgour has used marbles, and you can also use colored cards, or other methods.
I have enjoyed using my skewer sticks, but now use three coins. I don't care how many moving lines I get, because I feel the more information I get the better.
Here's what Bradford Hatcher says about sticks and coins:
The January, 1974 issue of Scientific American featured an article by Martin
Gardner on the Mathematics of the “I Ching,” which discusses these probabilities. For the coin method, the odds are 1/8, 3/8, 3/8 and 1/8 for 6, 7, 8 and 9 respectively. For the bu shi method, these are 1/16, 5/16, 7/16 and 3/16. So, while the odds of a line being an old or young Yin are equal to those of it being an old or young Yang, one is three times as likely to draw an old Yang over an old Yin. In other words, the advice would tend to be: too vigorous, slow down.
from:
http://www.hermetica.info/ Bradford Hatcher The Book of Changes, B - Introduction, pp 52-53
Thanks Brad!