In a 2005 FAA study, it became apparent that human error  associated with GA accidents is multifaceted. Specifically,  the analyses revealed that the largest percentage of accidents  is associated with skill-based errors, followed by decision  errors, violations of the rules and regulations, and perceptual  errors.  [Figure 2-5]  The next step will be identifying a variety  of interventions targeted at all four error groups. Eliminating  human errors is an unrealistic goal since errors are a normal  part of human behavior. On the other hand, realizing that  many aviation accidents are preventable means designing  ways to reduce the consequences of human error. The study  of human behavior coupled with pilot training that offsets  predictable human error helps achieve that goal.  Studies of human behavior help isolate characteristics and  behaviors that can lead to poor decision-making by a pilot. Chapter Summary ATC controller Weather 200 120 250 140 150 250 250 250 40 80 50 120 200 120 140 150 130 90 110 100 80 150 110 150 160 200 70 110 95 90 22 5 22 20 200 25 26 24 140 26 250 25 35 130 80 35 50 35 40 250 30 90 45 31 50 100 200 38 30 250 30 50 50 65 45 100 84 84 80 180 70 81 100 85 13 30 26 27 50 7 6 2 150 45 44 15 24 15 30 7 3 9 24 11 15 100 60 15 12 27 120 37 21 6 12 34 31 29 23 16 9 21 13 150 21 COLD W ROF WARM WK WARM WK SF 00 16Z24 WXOPN RW4 T.D. J Y 29.0N 8 5W M N I A MI IL IN MO A R L A MS AL TN GA FL SC NC KY VA MD DC NJ OH WI WV PA NY ME VT NH MA RI CT OR WA CA NV ID MT ND SD NE KS OK TX WY UT CO AZ NM IS AUTOMATIC DBS US DEPT OF COMMERCE NOAA/NWS/NMC WASHINGTON WEATHER DEPICTION 16Z THU 24 AUG NO91 0188 LLIN 90 70 100 11 14 110 140 140 10 76 55 78 15 85 140 90 65 41 48 40 50 35 30 55 120 150 70 250 120 250 80 85 90 200 100 30 19 25 29 50 50 70 45 70 50 43 250 60 56 55 110 100 250 250 95 110 140 75 13 120 16 80 120 23 15 17 30 25 21 24 25 25 45 37 30 22 17 90 84 84 150 SHADED AREAS...IFR WITH CIG LESS THAN 1000 FT AND/OR VSBY LESS THAN 3 MILES CONTOURED WITHOUT SHADING...MVFR AREAS WITH  CIG GREATER THAN OR EQUAL TO 1000 TO LESS THAN OR  EQUAL TO 3000 FT AND/OR VSBY GREATER THAN OR EQUAL  TO 3 TO LESS THAN OR EQUAL TO 5 MI NO CONTOURS...VFR  AREAS WITH CIG GREATER THAN 3000 FT AND VSBY GREATER THAN 5 MI XX Passenger EFIS XPDR 5537 IDNT LCL23:00:34 VOR 1 4100 OAT 7°C NAV1 108.00 113.00 NAV2 108.00 110.60 134.000 118.000  COM1 123.800 118.000 COM2 WPT  _ _ _ _ _ _  DIS  _ _ ._ $_{NM}$ DTK  _ _ _$_{°}$ TRK 360° HDG TAS A I R S P E D F A I L A L T I T U D E F A I L V E R T S P E D F A I L ATTITUDE FAIL CRS 071° HDG 273° TRAFFI C CAUTION Figure 2-5.  Accident-prone pilots fail to use readily available resources, or they simply do not listen.  2-5