POTENTIAL GND CONFLICT AFTER A RWY INCURSION BY A PA28-140 TRAINING FLT WITH A BEECH TWIN ON SHORT FINAL FOR RWY 14 AT STS; CA.

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WHILE PREPARING FOR TKOF AND HOLDING SHORT OF RWY I WAS ASSISTING MY STUDENT IN MAKING A RADIO CALL TO THE TWR. THERE WERE 4 ACFT HOLDING IN SEQUENCE; WE WERE #2 FOLLOWING A CESSNA CITATION. MY STUDENT ANNOUNCED OUR POS 'HOLDING SHORT OF RWY' AND INTENTION 'REQUESTING RWY XX FOR STRAIGHT OUT DEP.' WE HAD RECEIVED RESPONSE FROM THE TWR 'HOLD SHORT OF RWY;' AND WE RESPONDED WITH 'HOLD SHORT OF XX.' A CITATION JET HAD BEEN CLRED FOR TKOF AND WE WERE NEXT IN SEQUENCE. THERE WERE SEVERAL ACFT APCHING AND LNDG AT THE SAME TIME. TWR CLRED US; WHAT I BELIEVED I HEARD; 'PIPER X; TAXI INTO POS AND HOLD;' MY STUDENT HESITATED INITIALLY WITH RESPONSE AND LOOKED AT ME ASKING FOR ASSISTANCE. WHILE OBSERVING MY STUDENT'S HESITATION AND LACK OF IMMEDIATE RESPONSE; I SAID TO MY STUDENT TO RESPOND TO THE TWR AND START TAXIING. FINALLY I DECIDED TO TAKE OVER CTLS AND I BELIEVED I RESPONDED WITH 'PIPER X; TAXI INTO POS AND HOLD;' HOWEVER; BECAUSE I WAS TRYING TO INSTRUCT MY STUDENT; TALK AT THE SAME TIME; AND TRYING TO REDUCE CONGESTION AT HOLDING AREA; I DO NOT RECALL EXACTLY WHAT I HEARD AND WHAT I SAID TO THE TWR. I CROSSED RWY HOLDING POS AND PROCEEDED TO THE RWY TO HOLD. WHILE MAKING A TURN TO ALIGN THE AIRPLANE WITH CTRLINE; I NOTICED LNDG LIGHTS OF TFC ON ABOUT 0.5 MI FINAL MAKING ITS APCH FOR THE RWY I WAS TAXIING INTO. IN RESULT; THE CTLR ISSUED A 'GAR' TO INCOMING ACFT AND ASKED ME TO HOLD POS. AFTER THE INCIDENT AND REFLECTING ON THE CHAIN OF EVENTS AND CONTRIBUTING FACTOR; I BELIEVE THAT MISCOM BTWN ME; MY STUDENT AND TWR; AS WELL AS MY INTENTIONS TO REDUCE TFC CONGESTION AT HOLDING AREA BY RUSHING MY STUDENT; WERE THE ATTRIBUTING FACTORS OF THIS EVENT. IN ADDITION; FAILURE TO LOOK FOR INCOMING TFC ON FINAL; BEFORE XING HOLD POS; WAS A RESULT OF MY MISJUDGMENT THAT THE CTLR WOULD NOT CLR AN ACFT TO TAXI INTO THE RWY WITHOUT MAKING SURE THE RWY IS SAFE FOR OP. HOWEVER; THAT MISUNDERSTANDING OF THE CLRNC AND MISCONCEPTION PUT MY ACFT AND ACFT ON FINAL INTO A HECTIC SIT. BEFORE THAT INCIDENT; I WAS FULLY AWARE OF THE ADVISORY CIRCULARS DISCUSSING THE PROB OF RWY INCURSION; INCLUDING THE LETTER MAILED TO ALL PLTS IN JULY OF 2002 WITH AC120-74; 91-73. I AM CONSTANTLY USING THOSE MATERIALS AS A REF TO ALL DISCUSSION ABOUT RWY AND TAXI OPS AT THE ARPT. THIS INCIDENT WAS AN EXAMPLE OF HUMAN SUSCEPTIBILITY FOR ERRORS AND POOR JUDGEMENT. IN CONCLUSION; I WOULD LIKE TO THANK ALL CTLRS AND PLTS CONTRIBUTING TO SAFETY PROGRAMS AND MAKING SURE THAT NOBODY GETS HURT BECAUSE OF ONE'S MISTAKE; MISJUDGMENT; OR ERROR.