Welles Wilder (he of RSI fame, etc) met a chap who claimed he could predict markets, who then persuaded WW he could indeed do that. WW seems to have bought the chap out (Jim Sloman, or soemthing like that) as the chap is now selling a different system that is, presumably, even better.
WW markets Delta via his own website/company, who will expalin it all in a book for nearly £200, you'll then realise it's extremely painful to try to do it manually (not least because finding the turning points isn't as easy as you might hope) and that you need the software - buying into all of that is a over a grand, it then costs a couple of hundred a year to maintain.
Essentially the system predicts dates when the market, share, commodity price chart will change direction - turning points. Each market is geared up to turn according to a set of points long predetermined, and spookily enough when you see the charts in action you'll find a good many that seem to fit pretty well, You'll also find 'point 1' in the series suddenly becoming apparent in the noise, and realise many points do in fact occur awfully close to prediction, and repeatedly. The question is whether 'repeatedly' equals 'often enough', how close is close, and a small problem where the chart turns upside down occasionally.
(That last point sounds more facetious than intended <g>)
I don't want to bad mouth it, it's one of those things where you will believe it's more than mere fancy - the points occur as planned quite often - I've yet to encounter anyone who is making if pay, but it's marketted as totally hush hush so you won't find a lot of charts posted for example.
Dave