PLTDEV APCH TO WRONG RWY.

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ON A FLT INBOUND ON THE MEINTZ 6 ARR INTO MSP WE WERE VECTORED W OF THE ARPT FOR A VISUAL TO RWY 11L. VISUAL APCHS TO RWY 11L AND RWY 11R WERE BEING CONDUCTED. WHEN WE WERE TURNED ONTO A R BASE FOR RWY 11L WE WERE INSTRUCTED TO LOOK FOR AN MD-80 ON A L BASE FOR RWY 11R; 1000 FT BELOW. AS WE ROLLED OUT ON THE GIVEN HDG FOR THE BASE WE SAW THE XING TFC TURNING FINAL FOR RWY 11R. IN OUR APCH BRIEFING WE DISCUSSED THE FREQ AND INBOUND COURSE FOR THE ILS 11L AND THE COPLT (PF) HAD IT DIALED INTO HIS RADIO; MY RADIO WAS SET TO THE VOR FOR DME AS REQUESTED BY THE COPLT. WHEN I CALLED THE TFC AND ARPT IN SIGHT WE WERE CLRED THE VISUAL FOR RWY 11L AND TOLD TO CONTACT THE TWR. DUE TO THE BASE HDG ASSIGNED AND THE TIME TO IDENT THE TFC AS WE MADE THE TURN WE OVERSHOT FINAL. BOTH PLTS IDENTED THE OVERSHOOT AND THE COPLT ESTABLISHED A GOOD REINTERCEPT FOR THE FINAL (ANGLING L BASE). THEN THE COPLT ASKED FOR THE GEAR DOWN AND FINAL DSCNT CHKLIST. AS MY HEAD WAS IN THE COCKPIT DOING THE FINAL DSCNT CHKLIST WHICH INCLUDED SETTING MY RADIO TO THE ILS; THE COPLT ASKED ME WHAT I THOUGHT THE TFC IN FRONT OF US (3 OR SO MI OVER THE THRESHOLD) WAS DOING 'TAKING OFF OR LNDG.' AFTER FOCUSING ON THE TFC AND DECIDING HE WAS LNDG AND THERE SEEMED TO BE ADEQUATE SPACE I RESUMED SETTING IN MY RADIOS TO SEE US FULL DEFLECTION TO THE L. THIS IS WHEN BOTH WE AND THE TWR (WHO HAD CLRED US TO LAND PREVIOUSLY) REALIZED WE WERE LINED UP FOR RWY 11R (APPROX 1100 FT AGL). THE TWR ASKED US IF WE COULD SIDESTEP TO RWY 11L WHICH WE STARTED TO DO BUT THEN DECIDED IT WOULD BE SAFER TO GAR. WE WENT AROUND AND LANDED UNEVENTFULLY ON RWY 11L. BOTH PLTS MADE POOR ASSUMPTIONS; WHEN I GOT MY HEAD OUT OF THE COCKPIT TO CHK THE LNDG TFC I DID NOT ASSESS THE REST OF THE SURROUNDINGS BUT FOCUSED ONLY ON THE TFC AND ASSUMED THE COPLT HAD INTERCEPTED THE CORRECT RWY FINAL. HE ALSO ASSUMED THAT HE HAD INTERCEPTED TO CORRECT FINAL VISUALLY AND DID NOT GO BACK TO HIS INSTS TO CONFIRM.