A G3 FLC UNDERSHOOTS THEIR ASSIGNED XING ALT WHEN THE FO FAILS TO RESPOND TO THE PIC'S ALERTS REGARDING HIS RATE OF DSCNT 125 MI S OF DTW; MI.

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ON AUG/FRI/01; WE HAD A PART 91 FLT IN OUR GULFSTREAM III FROM APF-PTK. IT WAS THE COPLT'S LEG AND ON OUR INITIAL DSCNT INTO PTK; OUR CLRNC WAS TO DSND TO FL310 WITHIN 5 MINS. ALL CHKLISTS ON DSCNT WERE COMPLETE AND OUR FMS'S WERE ARMED FOR THE DSCNT PROFILE. TO BE AT FL310 AT THE DESIRED TIME CALLED FOR 2000 FPM. THE COPLT BEGAN A 1000 FPM DSCNT AND REFUSED TO INCREASE THAT RATE TO ACCOMPLISH THE DESIRED ALT RESTR. AFTER 5 VERBAL WARNINGS FROM ME; I DEMANDED AN INCREASE IN HIS RATE OF DSCNT. HOWEVER; BY THIS TIME; TO MEET OUR RESTR; OUR DSCNT NEEDED TO BE 3900 FPM. I IMMEDIATELY PULLED BOTH THROTTLES BACK TO IDLE AND STEEPENED OUR DSCNT TO ACHIEVE OUR RESTR. BY THE TIME I FINALLY TOOK OVER THE CTLS; I REALIZED WE WERE GOING TO BE HIGH ON OUR DSCNT PATH. I TOLD CTR OF OUR DIFFICULTIES AND HE ACKNOWLEDGED AND PUT US ON A VECTOR TO RESOLVE ANY CONFLICTS. ON THE GND; I QUESTIONED THE COPLT ABOUT HIS ACTIONS. HIS RESPONSE WAS HE WAS NOT PAYING CLOSE ATTN AND HE WAS SORRY. I BELIEVE MANY FACTORS LED TO THIS SIT. FIRST AND MOST IMPORTANTLY; AS A YOUNG CAPT AND AN OLDER COPLT; THERE WAS A GREAT DEAL OF 'I SHOULD BE IN YOUR SEAT-ITIS.' I STRONGLY BELIEVE THIS ATTITUDE SHOULD BE MORE THOROUGHLY COVERED IN CRM COURSES/TRAINING. AT THE VERY LEAST; IN THE FUTURE; I WILL INCLUDE THIS INTO MY PREFLT BRIEFING.