That doesn't mean that the principles discussed herein aren't still valid. On the contrary, the technical principles explained in this booklet are as valid today as they were ten years ago. The changes have more to do with the broader application of technical analysis by professional traders and the investing public. With the growing use of personal computers, and ready access to the Internet, the ability to chart markets has increased dramatically. Charting software is relatively inexpensive.
Many Internet services allow the public to chart for free.
That increased access has contributed to a much greater use of charts for decision-making purposes, which has helped produce a much greater understanding and appreciation of what charts can do.