C152 INSTRUCTOR PLT HAS A RWY EXCURSION AFTER TAKING CTL OF ACFT FROM STUDENT PLT WHO HAD EXPERIENCED A HARD LNDG AT MGM.

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I AM A CFII WHO WAS ATTEMPTING TO TEACH A STUDENT PLT; WITH ABOUT 13 FLT HRS; HOW TO LAND. THE STUDENT HAD ACCOMPLISHED SEVERAL LNDGS WITHOUT MY ASSISTANCE; BUT MOST OF THE TIME I WAS STILL HAVING TO ASSIST WITH THE FLARE AND TOUCHDOWN. WE HAD SPENT ABOUT 45 MINS IN THE TFC PATTERN AND HAD ACCOMPLISHED 7 TOUCH-AND-GOES WHEN MY STUDENT INDICATED THAT HE WAS TIRED AND REQUESTED THAT THIS BE THE LAST LNDG. I NOTICED THAT HE WAS PERSPIRING AND I AGREED; WHILE ENCOURAGING HIM THAT THIS LNDG WOULD BE A 'GOOD ONE.' WE HAD ABOUT AN 8 KT XWIND AND I HAD INSTRUCTED HIM REPEATEDLY TO MAINTAIN THE 'CTRLINE' ON LNDG; BECAUSE WE HAD LANDED ON THE R PORTION OF THE 150 FT WIDE RWY SEVERAL TIMES. THIS BEING THE FINAL LNDG OF THE DAY; I HAD DECIDED THAT I WOULD TRY MY BEST TO ALLOW MY STUDENT TO ACCOMPLISH THIS LNDG WITHOUT ANY ASSISTANCE FROM ME. AS WE STARTED TO FLARE; WE BALLOONED UP SLIGHTLY AND THEN DROPPED FIRMLY ONTO THE RWY. ONCE AGAIN WE HAD DRIFTED TO THE R SIDE OF THE RWY. WHEN WE HIT THE GND HARD; WE BOUNCED UP INTO THE AIR AND CONTINUED TO DRIFT TOWARD THE R EDGE OF THE RWY. AS I GRABBED THE CTLS AND ATTEMPTED TO ADD SOME PWR AND SLIGHTLY LOWER THE NOSE TO DAMPEN THE BOUNCING; WE STRUCK THE GND ONCE AGAIN. AT THIS TIME I NOTICED THAT WE HAD DRIFTED COMPLETELY OFF OF THE RWY AND WE WERE IN THE GRASS. FEARING A POSSIBLE PROP STRIKE OR LOSS OF CTL; I ADVANCED FULL THROTTLE; PUSHED THE CARB HEAT IN; AND RAISED THE FLAPS. I THEN ATTEMPTED TO FIRMLY ROTATE THE AIRPLANE; BUT THE CTLS WERE SLUGGISH AND I FEARED A STALL SIT MIGHT BE ARISING. WE HAD A NOSE-HIGH ATTITUDE; BUT WE WERE NOT ACCELERATING. I LOWERED THE NOSE; PULLED THE PWR TO IDLE; AND DECIDED TO 'RIDE OUT' THE LNDG IN THE GRASS. THE GND WAS SET AND THE GRASS WAS NOT CLOSELY CUT; AND THIS CONTRIBUTED TO MY LACK OF ACCELERATION. WE DROVE ACROSS AN INTERSECTING RWY (WHICH WAS INACTIVE AT THE TIME) AND CONTINUED IN THE GRASS WHILE SLOWING. I EXITED THE GRASS AS I APCHED A TXWY AND WAS CLRED BY THE TWR TO TAXI TO THE RAMP. I AM UNAWARE OF ANY DAMAGE TO RWY OR TAXI LIGHTS; BUT THERE WAS SOME MINOR DAMAGE TO THE R WHEEL OF THE PLANE. I FEEL THAT MY REACTIONS TO THE HARD LNDG WERE NOT AS QUICK AS THEY SHOULD HAVE BEEN. I FAILED TO TAKE SERIOUSLY ENOUGH THE MENTAL AND PHYSICAL FATIGUE OF MY STUDENT. I ALSO DECIDED THAT THE STUDENT WOULD LAND THIS TIME WITHOUT ANY OF MY ASSISTANCE. I ALSO ALLOWED MY STUDENT TO CONTINUE AN ATTEMPTED LNDG WHILE NOT OVER THE CTRLINE OF THE RWY. LUCKILY; NO ONE WAS INJURED AND THE PLANE WAS ONLY SLIGHTLY DAMAGED. I HAVE LEANED FROM THIS INCIDENT AND I HOPE THAT OTHERS MAY AS WELL.