What Successful Traders Do

I recently wrote a foreword for a very interesting book of interviews with successful daytraders that will be coming out shortly.  Among the excellent contributors were @modernrock, @OzarkTrades, @InvestorsLive, @lx21, @offshorehunters, @elkwood66, @kroyrunner89, @DerrickJLeon, @johnwelshtrades, and @TomKellyLV, Although my trading is different from theirs–and theirs is quite different from that of portfolio managers I work with–I notice three broad areas of overlap.  These seem to be common elements of what makes traders successful.