His methods were designed to be purely mechanical, removing emotional bias by providing clear, math-based signals for when to enter a position.
Crabel identified that when the market experiences an unusually tight trading range (the narrowest in 4 or 7 days), it is often a precursor to a massive spike in volatility and a sharp price move. Toby Crabel - Day Trading with Short Term Price...
This is Crabel's most famous contribution. It involves identifying a specific price range during the first few minutes of the trading day and entering a trade when the price "breaks out" of that range, signaling the day's likely trend. His methods were designed to be purely mechanical,