C152 INSTRUCTOR AND STUDENT POSSIBLY ENTERED ORD CLASS B AIRSPACE WITHOUT CLRNC.

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WAS ON A VFR TRAINING FLT FOR STALL TRAINING AND SPIN AWARENESS; CLBING OUT OF LOT. NORMALLY; I STAY LOW UNTIL WELL CLR OF CLASS B AIRSPACE; BUT TODAY I INSTRUCTED STUDENT TO LEVEL OFF AT 3500 FT MSL; 100 FT SHY OF ORD CLASS B AIRSPACE; SO WE COULD GET OUT OF EVERYONE'S WAY. I TRIED TO LEAVE A LITTLE ROOM BELOW THE CLASS B AIRSPACE; EVEN THOUGH BY THE TIME WE COULD REALISTICALLY HAVE REACHED THAT ALT; WE SHOULD HAVE BEEN WELL CLR OF THE CLASS B AIRSPACE. WELL; TFC RPTED COMING FROM THE N ENTERING A XWIND FOR RWY 27; WHICH WE HAD JUST DEPARTED; AND WERE CURRENTLY ABOUT THE AREA OF A XWIND LEG. I HAD THE STUDENT LEVEL OFF BRIEFLY TO LOOK FOR TFC. AFTER SPOTTING TFC; I INSTRUCTED HIM IT WAS ALRIGHT TO CLB. HE CONTINUED TO CLB AS I WAS LOOKING OUTSIDE SCANNING FOR OTHER TFC. AS I BROUGHT MY HEAD BACK INTO THE COCKPIT; I LOOKED AT THE ALTIMETER TO SEE WE WERE AT 3600-3700 FT MSL. I YELLED AT THE STUDENT TO LEVEL OFF AND INFORMED HIM OF THE SIT; AND THAT WE MAY BE IN VIOLATION. I TOOK HIS SECTIONAL CHART AND ESTIMATED THAT WE HAD TO BE CLR OF THE CLASS B AIRSPACE BY APPROX 3-5 MI BUT THAT IT WAS CLOSE. I THEN INSTRUCTED HIM TO TURN FURTHER S AND AWAY FROM THE CLASS B AIRSPACE; AND THEN TO CONTINUE THE CLB A LITTLE FURTHER AWAY. I THINK THE LACK OF SITUATIONAL AWARENESS ON MY PART WAS A CONTRIBUTING FACTOR. I SHOULD HAVE BEEN PAYING CLOSER ATTN INSIDE THE ACFT AS WE APCHED OUR ALT; AND CLOSER ATTN TO WHERE WE WERE IN REGARDS TO THE CLASS B AIRSPACE. I ALSO SHOULD NOT HAVE ALLOWED MYSELF TO BE SO DISTR BY THE TFC TO LOSE SUPERVISION OF MY STUDENT'S ACTIONS. THE STUDENT SHOULD HAVE ALSO BEEN MORE AWARE OF HIS ALT AND OUR LOCATION. ESPECIALLY AFTER BEING REMINDED OF WHAT ALT WE WERE CLBING TO. TO CORRECT FOR THIS SIT; AND TO AVOID ANOTHER CLOSE CALL AS WE WERE NOT IN VIOLATION; HOPEFULLY; BETTER SITUATIONAL AWARENESS IS NEEDED; ALONG WITH BETTER SUPERVISION OF MY STUDENTS. I CANNOT RELAX MY SUPERVISION WHILE BEING DISTR OUTSIDE. I ALSO CAN PROBABLY LEAVE A LITTLE MORE ROOM FOR ERROR WHEN DEPARTING THE AREA; OR USE MY NORMAL METHOD OF STAYING LOW UNTIL WELL CLR.