System traders funnel all of their technical indicators into specific buy and sell signals. They then test those systems for stability. The more stable the systems performance is over time, the higher its ranking. If you  test enough systems that follow multiple trading styles (trend, momentum & pattern) and time frames (30/45/60/90/120/EOD & EOW), you can grade how receptive a market is to trading.

Here are the results for the Grain markets.

Grain Grades:

 

Our trading systems go through an exhaustive stress testing process; hence, our market grades will adjust slowly over time.  For the most part however, the grades we see today will provide an accurate assessment of trade stability well into the foreseeable future.

Trade wisely … select a market that is receptive to trading based on stability rather than unsustainable short-term performance.