A BE95 TRAINING FLT LEAVES ITS ASSIGNED ALT AND HDG WHEN THE TRAINEE FOLLOWS TO THE EXPECTED CLRNC PRIOR TO RECEIVING CLRNC TO DO SO NEAR MRLIN INTXN; FL.

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AS A FLT INSTRUCTOR; I WAS WORKING WITH AN INST RATED PLT WHO WAS WORKING ON HIS CFI AIRPLANE RATING. THE 2 OF US AND 3 PAX (TWO OF WHICH ARE ALSO PLTS) WERE GOING TO THE BAHAMAS ON VACATION. WE HAD BEEN CLRED TO 6000 FT AND GIVEN A VECTOR TO JOIN A VOR COURSE AND HAD BEEN TOLD TO EXPECT 9000 FT 10 MINS AFTER DEP AND TO EXPECT TO FOLLOW A VOR RADIAL. THE CFI STUDENT; WHO WAS FLYING; WRONGLY INTERPED THIS TO MEAN THAT AFTER 10 MINS HE WAS CLRED TO CLB TO THE EXPECTED ALT AND TAKE UP THE ASSIGNED ROUTING. HE AT ONE POINT READ BACK TO THE CTLR THAT HE WAS CLBING TO 9000 FT. I THOUGHT THAT PERHAPS I HAD MISSED A CALL FROM THE CTLR CLRING US TO CLB ABOVE THE INITIAL ALT RESTR OF 6000 FT AND; WHEN THE CTLR DID NOT QUESTION THE ANNOUNCED INTENTION TO CLB TO 9000 FT; I ALSO DID NOT REMARK ABOUT IT. ON REACHING JUST SHORT OF 7000 FT; THE CTLR DIRECTED US TO LEVEL AT 7000 FT AND INDICATED THAT WE SHOULD HAVE STOPPED AT 6000 FT. IN THE CHICAGO AREA; MOST INST INSTRUCTION IS CONDUCTED WITH THE INSTRUCTOR SIMULATING BEING THE CTLR SINCE CHICAGO APCH CTL HAS NO DESIRE TO SUPPORT PRACTICE INST TRAINING. FILING IFR IS A VERY TEDIOUS PROCESS AND INVOLVES MANY DELAYS BECAUSE THE AIRSPACE IS SO CROWDED. THEREFORE; I DO NOT BELIEVE INST STUDENTS GET ENOUGH PRACTICE WORKING IN THE REAL ATC ENVIRONMENT. I HAVE RESOLVED TO MAKE IT A POINT TO TAKE MY INST STUDENTS TO SOUTH BEND ON A MORE REGULAR BASIS. IT WILL MAKE FOR LONGER FLTS BUT IT WILL GIVE THEM THE CHANCE TO BECOME FAMILIAR WITH ATC PROCS AND TERMINOLOGY.