The bottom line for any trading technique or system is its practical application in the real world, regardless of the lovely theories that may have been used in back-testing its strategies. Like scientists, many trading systems are forced to focus on a narrow set of parameters in this regard because the broader the parameters are, the harder it becomes to reproduce the result. A technique that applies itself to the conditions so you can choose appropriate entry and exit points. A set of results following the use of the technique to see if it works when tested in real time. Because you are looking at a short-term trade, the market must be efficient and respond optimally to your orders.
Several factors make markets efficient, the most obvious, of course, is liquidity.
Your association with the trading floors also is key. Because the bracket trading technique places orders before the markets open, direct floor access is less important than it would be in an intraday technique. But your ability to get filled when the market starts moving is key with this technique. Perhaps the most important factor to the day-trader is the ability of these markets to process information quickly. Again, experience being the great teacher it is, you can see clearly in a short time whether a market is responding in a timely fashion to changes in important information regarding that market.