For a back-test to fall victim to curve fitting it would need to have way more variables than this strategy. Here the strategy is the stock and how it reacts for thirty days after its earnings release (regardless of its quarterly results). There is no place where curve fitting can be introduced, everything is static. It definitely can be applied to other stocks, it's just a matter of finding them. I use http://stocksearning.com/ to locate stocks that have consistent 7 day trends after earnings and then they can be back-tested in the Trade Machine to determine if the trend holds for 30 days. I would imagine we could find 5 or so that we can use each earnings cycle.