This is what I got from Wikipedia. Here is the link
http://en.wikipedia.org/wiki/I_ChingThere is more, this is a start I suppose. I&I put the word in Google and there is a lot about it on the web. Cannot give you anything from personal expirence because I&I have never studued it.
The I Ching (often spelled as I Jing, Yi Ching, Yi King, or Yi Jing; also called "Book of Changes" or "Classic of Changes") is the oldest of the Chinese classic texts. A symbol system designed to identify order in what seem like chance events, it describes an ancient system of cosmology and philosophy that is at the heart of Chinese cultural beliefs. The philosophy centres on the ideas of the dynamic balance of opposites, the evolution of events as a process, and acceptance of the inevitability of change (see Philosophy, below). In Western cultures, the I Ching is regarded by some as simply a system of divination; many believe it expresses the wisdom and philosophy of ancient China.