Narrative:

On or about XA50Z cessna aircraft X requested taxi and beacon code for VFR flight to bed. While I was typing information in the ARTS key pack, aircraft Y called for an IFR clearance to iag. After getting the beacon code for aircraft X, I read it to him and gave him taxi from FBO to runway 19 and he acknowledged. I then read aircraft Y his clearance to iag and told him to advise when he was ready to taxi. He said he was ready and I asked if he could accept the runway 19 dalton departure, to which he answered in the affirmative. I amended his clearance to the runway 19 dalton departure and instructed him to taxi to runway 19. At XB55Z aircraft X reported a collision with aircraft Y on taxiway P. Aircraft Y apparently was unaware of the incident.

Google
 

Original NASA ASRS Text

Title: ATCT CTLR AT TEB CLRS A C172 AND A C402 TO RWY 19 AND WHILE TAXIING, THE C172 PLT RPTS COLLIDING WITH THE C402.

Narrative: ON OR ABOUT XA50Z CESSNA ACFT X REQUESTED TAXI AND BEACON CODE FOR VFR FLT TO BED. WHILE I WAS TYPING INFO IN THE ARTS KEY PACK, ACFT Y CALLED FOR AN IFR CLRNC TO IAG. AFTER GETTING THE BEACON CODE FOR ACFT X, I READ IT TO HIM AND GAVE HIM TAXI FROM FBO TO RWY 19 AND HE ACKNOWLEDGED. I THEN READ ACFT Y HIS CLRNC TO IAG AND TOLD HIM TO ADVISE WHEN HE WAS READY TO TAXI. HE SAID HE WAS READY AND I ASKED IF HE COULD ACCEPT THE RWY 19 DALTON DEP, TO WHICH HE ANSWERED IN THE AFFIRMATIVE. I AMENDED HIS CLRNC TO THE RWY 19 DALTON DEP AND INSTRUCTED HIM TO TAXI TO RWY 19. AT XB55Z ACFT X RPTED A COLLISION WITH ACFT Y ON TXWY P. ACFT Y APPARENTLY WAS UNAWARE OF THE INCIDENT.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.