Agreed with mediaman here. Select both successes AND failures. Where they seem similar, those things may not teach us much. Where there is a pattern shown ON

Agreed with mediaman here. Select both successes AND failures. Where they seem similar, those things may not teach us much. Where there is a pattern shown ONLY IN ONE SIDE (more or less) there might be a lesson. I have a fear that there's isn't a lot you can do to guarantee success, but I admit this is just my feeling, not based on any facts or stats.