RECENT IOE; D328 FO OVERSHOOTS ASSIGNED ALT AS CAPT QUESTIONS ACTIONS.

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FIRST FLT WITH A GREEN FO; STILL A HIGH MINIMUMS CAPT. MET FO IN SAME TRAINING CLASS. GAVE FO TOO MUCH CREDIT. WAS ASKED TO DSND TO 14000 FT ON OUR WAY TO CAE. NOTICED FO GOING THROUGH 14000 FT. CALLED ALT. FO SAID 'I GOT IT' (WE WERE ON AUTOPLT VNAV DSCNT). NOTICED FO'S HAND GOING FOR FLT DIRECTOR PANEL FOR CORRECTION. NOTICED HE WAS SLOW ON CORRECTION. CALLED ALT AGAIN. FO STILL FOOLING WITH FLT DIRECTOR. TOLD HIM TO DISCONNECT AUTOPLT. GAVE FO ANOTHER ALT CALL. HE SAID HE'D GOT IT; AND DISCONNECTED IT AND MADE CORRECTION. FO WAS TOO SMOOTH ON CORRECTION AND WE BUSTED ALT (NOT SURE BY HOW MUCH -- IT MAY HAVE BEEN AS MUCH AS 4000 FT). APCH ASKED US TO CONFIRM ALT AND SAID WHAT THE ALTIMETER SETTING WAS. TOLD APCH 14000 FT AND REQUESTED LOWER; WE'RE EXPERIENCING CONTINUOUS MODERATE CHOP (WHICH WE WERE AT THE TIME AS WELL). WE WERE IN THE MIDDLE OF SOME SCATTERED CUMULO NIMBUS AND THE RIDE WAS GETTING ROUGH. CTLR GAVE US PROMPTLY A DSCNT TO 13000 FT; AND THEN 12000 FT. LATER IN DEBRIEF WITH FO; DISCOVERED THAT WHILE IN FLT LEVEL CHANGE DSCNT; AS WE WERE CAPTURING ALT IN VASEL; HE HIT -- BY ACCIDENT -- THE WRONG BUTTON AND THAT IS WHY AUTOPLT WENT THROUGH ALT. EVEN THOUGH FO SAID HE'D GOT IT UPON MY ALT CALL; HE WAS CONFUSED AND NOT SURE HOW TO CORRECT FOR IT; BUT FAILED TO SPEAK UP ABOUT HIS DILEMMA. LOOKING BACK AT THE EXPERIENCE; I REALIZED THAT I GAVE HIM TOO MUCH CREDIT FOR HIS EXPERIENCE LEVEL AND WHEN HE DID NOT MAKE THE CORRECTION RIGHT AWAY; [I SHOULD HAVE] TAKEN OVER AND DISCONNECTED THE AUTOPLT MYSELF AND CORRECTED ALT. IN DEBRIEF; FOUND OUT THAT THIS WAS THE FO'S ONLY SECOND FLT OUT OF IOE (AFTER NOT HAVING FLOWN FOR 1 - 1 1/2 WKS). CONTRIBUTING FACTORS WERE FO'S LIMITED (FIRST) EXPERIENCE OF OUR COMPANY WITH SUCH A HIGH TECH (GLASS COCKPIT) AIRPLANE. FO ALSO UP TO THAT POINT WAS DOING GREAT; WHICH GAVE ME A FALSE SENSE OF SECURITY THAT HE REALLY HAD THINGS UNDER CTL WHEN HE SAID 'I GOT IT.' FO TRAINING DRAGGED ON FOR OVER 4 MONTHS; WHICH I THINK IS THE LAST CONTRIBUTING FACTOR. MINE DRAGGED FOR 7. PUTTING 2 LOW TIME PLTS (ME 75 HRS PIC IN TYPE) AND FO CONSIDERABLY LESS (HIS SECOND FLT) IS NOT A GOOD THING. YOUR FIRST COUPLE HUNDRED HRS; YOU SHOULD FLY RIGHT AWAY UNTIL EVERYTHING NEW (FLT DIRECTOR/GLASS COCKPIT) BECOMES OLD HAT.