INSTRUCTOR AND STUDENT TRAINING IN IMC DSND BELOW DECISION HEIGHT INADVERTENTLY.

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MY STUDENT; WHO IS A PRIVATE MULTI ENG PLT; CALLED ME BECAUSE HE WANTED TO FLY AND GET SOME ACTUAL IFR EXPERIENCE. WE CALLED FSS AND GOT A WX BRIEFING; FILED AN IFR FLT PLAN FROM DAYTONA BEACH TO CRG. WE DID THE PREFLT AND FLEW TO CRAIG ARPT (CRG). WX WAS RPTED 200 FT OVERCAST 2 MI VISIBILITY. WX AT DAB WAS VFR. JACKSONVILLE APCH GAVE US THE CLRNC TO DSND AND INTERCEPT THE LOC FOR ILS 32 AT CRG. EVERYTHING DURING THIS PART OF THE FLT WENT WITHOUT PROBLEM. WE INTERCEPTED THE LOC AND STARTED THE ILS 32 AT CRG; JACKSONVILLE APCH HANDED US TO CRG TWR; WE RPTED AND WE HAD THE CLRNC TO LAND. THE STUDENT WAS GETTING A LITTLE BEHIND THE PLAN. I WAS DIVIDING THE ATTN BTWN AUTORIDE; TEACHING; AND MAKING SURE THAT WE WERE ON COURSE. THE STUDENT FORGOT THE DECISION HEIGHT AT ABOUT 400 FT. HE STARTED LOOKING TO THE APCH PLATE AND STARTED LOSING THE GS. I TOLD HIM TO GET IT BACK; HE MADE A CORRECTION; AND THEN TOLD ME THAT THE DECISION HEIGHT WAS 291 MSL; AT THIS POINT I LOOKED AT THE ALTIMETER AND IT WAS 275; IMMEDIATELY I LOOKED OUTSIDE AND I HAD THE RWY ENVIRONMENT; SO I DECIDED TO MAKE THE LNDG INSTEAD OF FLYING A MISSED APCH. AT THAT POINT; I CONSIDER THAT IT WAS SAFER TO LAND; THAN CONTINUE FLYING; BECAUSE MY STUDENT WAS REALLY NERVOUS.