C90 CTLR WITNESS OPERROR AT 4000 WHEN ANOTHER CTLR INADVERTENTLY TURNED AN ARR TO THE WRONG HEADING; CITING FATIGUE AS A MAJOR FACTOR.

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(I OBSERVED THE SITUATION AND TRIED TO INTERVENE TO HELP SALVAGE THE SITUATION.) THE 1ST ACFT; ACFT X; WAS TURNED S BY ARR CTLR DIRECTLY AT TFC AT SAME ALT (4000 FT) ON RWY 27R ARR TO ORD. THE CTLR HAD INADVERTENTLY ISSUED A 180 DEG HDG RATHER THAN THE 90 DEG HDG HE THOUGHT HE HAD GIVEN. I AM CONVINCED THAT EVERYONE'S REACTION TIME WAS SIGNIFICANTLY DELAYED AND THAT; THE INITIAL MISTAKE AND SUBSEQUENT SLOW REACTIONS WERE ENTIRELY DUE TO CTLR FATIGUE. THE ERROR OCCURRED WITHIN THE LAST 30 MINS OF A LONG WORKWEEK. MGMNT'S MANDATORY 'TIME ON POS' WAS A DIRECT SAFETY ISSUE AND WILL CONTINUE TO BE; AT LEAST AT A FACILITY SUCH AS C90. SUCH 'BLANKET' POLICIES OF MGMNT ARE LATENTLY HOSTILE AND SHORT-SIGHTED. LCL MGMNT SHOULD BE ALLOWED TO DICTATE ITS OWN POLICIES IN ORDER TO PROCURE THE SAFEST WORK CONDITIONS. THIS IS NOT FACTORY WORK -- OR OFFICE WORK. DECISIONS ARE MADE CONTINUALLY ON POS APPROX EVERY 3 SECONDS. FINALLY; THE CTLR WHO HAD THE ERROR HAD PERSONALLY CONFIDED IN ME HIS FATIGUE SHORTLY BEFORE THE ERROR OCCURRED.