CLRNC CONFUSION ABOUT WHETHER ACR LGT FLT WAS CLRED TO 6000 OR 8000 FT IN DSCNT TO SLC.

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WE WERE TRACKING INTO SLC ON THE OGDEN 153 DEG RADIAL. IN SHORT ORDER; WE WERE GIVEN A HDG; ALT; AND RWY CHANGE FROM 16R TO 16L. AT THE SAME TIME WE WERE TRYING TO SLOW DOWN; CONFIGURE AND RUN THE CHKLISTS. PASSING 7700 MSL; THE CTLR TOLD US TO LEVEL AT 8000 FT. THE CAPT STOPPED THE DSCNT AND I INFORMED THE CTLR THAT WE WERE NOW AT 7500 MSL BUT WOULD CLB BACK TO 8000. THE CTLR THEN ASKED IF HE HAD GIVEN US 8000 INITIALLY. I TOLD HIM THAT WE UNDERSTOOD 6000. NOTHING MORE WAS SAID. I STILL DON'T KNOW IF WE WERE INITIALLY GIVEN 6000 OR 8000 BECAUSE NEITHER THE CAPT NOR I CAN SPECIFICALLY REMEMBER THAT INSTRUCTION. I DO KNOW THAT WITH 6000 THE GS INTERCEPT FOR 16L -- WE BELIEVED WE WERE GOING TO THE CORRECT ALT. SUPPLEMENTAL INFO FROM ACN 203278: WE BECAME PREOCCUPIED WITH REPROGRAMMING THE FMS; SELECTING; TUNING AND IDENTING THE NEW ILS FREQ; SLOWING THE ACFT DOWN; AND DSNDING THE ACFT TOWARD THE RWY. AFTER LNDG THE FO AND I DISCUSSED THE INCIDENT AND NEITHER COULD REMEMBER SPECIFICALLY ALL THE ATC COMMANDS THAT WERE GIVEN IN THAT XMISSION. HOWEVER; I (THE CAPT) WAS HAND FLYING THE ACFT AND THE FO WAS PROGRAMMING THE INSTRUCTIONS IN MODE CTL PANEL. ATC COMMANDS WHICH INVOLVE RWY CHANGES; HDG CHANGE; ALT CHANGE; ILS APCH CHANGE; FREQ CHANGE ALL IN THE SAME XMISSION TO A 2-MAN ADVANCED TECHNOLOGY ACFT CAN LEAD TO CONFUSION; ESPECIALLY TO A CREW EITHER NEW TO ACFT OR ARPT.