Gerald Appel is a pioneer of chart based market timing. He also has a commendable track record. He has been ranked very highly for long term performance multiple times by the Hulbert market advisory rating service.

Mr. Appel, and his talented son Marvin, could have written a complex tome for market heads. This book, though, seems aimed at the vast majority of investors who do not want to take up economics, markets, and finance as an avocation. It aims to improve safety, and possibly returns, for retirement savers while keeping it as simple as possible. I think it succeeds in this mission.

The Appels' method of making minor quarterly adjustments within a portfolio of low cost exchange traded funds using tested techniques of market timing, asset allocation, and diversification does seem to add value for those willing to spend half an hour to an hour every three months. I imagine buy-and-hold investors spend more time than that worrying when markets go down sharply.

It's worth remembering that improving performance by, on average, a few percentage points a year, means you will retire with strikingly more money. Doing it by reducing losses along the way also makes it easier to stick to your plan, and it makes life more enjoyable!

杰拉尔德·阿佩尔是基于图表的市场时机选择的先驱。他也有值得称赞的业绩记录。他曾多次被Hulbert市场咨询评级服务公司（Hulbert market advisory rating service）评为长期业绩最佳人选。
阿佩尔和他才华横溢的儿子马文本可以为市场负责人写一本复杂的大部头书。不过，这本书似乎针对的是绝大多数不想把经济、市场和金融作为业余爱好的投资者。它旨在提高退休储户的安全性，并可能提高回报率，同时尽可能简化操作。我认为这次任务成功了。
对于那些愿意每三个月花半个小时到一个小时的人来说，Appels使用经过测试的市场时机、资产配置和多样化技术，对低成本交易所交易基金的投资组合进行小规模季度调整的方法，似乎确实增加了价值。我想，当市场大幅下跌时，买入并持有的投资者花在担心上的时间要比担心的时间多。
值得记住的是，平均每年提高几个百分点的表现，意味着你退休后会有更多的钱。一路上减少损失也能让你更容易坚持你的计划，让生活更愉快！