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There are definitely implementation problems with what I'm talking about.
It's just trying to make mechanical what Mungo posts so often about: selling around the approximate top and putting money back in when there's blood in the streets.
Easy to say and hard to do.

Back when I was first looking at timing, I found a number of systems that seemed reasonable and which I thought I understood. Then I sat down and wrote down the exact steps (rules) for the system.....and realized that there was a whole bunch of handwaving. If you cannot write down the rules and the steps to take--the EXACT rules that could be programmed into a shell script or batch file or excel spreadsheet--then you will not be able to use the system.

For example: What exactly does "blood in the streets" mean?

It's easy to say because there's usually nothing concrete, just a bunch of vague and/or contradictory rules. It's hard to do-- for the same reason.

Pretend that you are writing down the instruction that your son/wife/mother are going to follow to manage your money while you are in a coma. Can it be done?

A good example was when I was investigating the Guyton-Klinger withdrawal method. I understood it (I thought!), and tried to write a spreadsheet to do it. Came to a part where I just couldn't figure what to do. So I posted a detailed question on a retirement investing board. Half a dozen people replied to help straighten me out. Every single one started out with "Oh, that's simple. You just do this and that and .... hmmm, well actually I can't figure it out either."
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