The 73 is aimed towards the American Middle School market and the European equivalent. It is an entry level graphing calculator that won't be hard on the school's pocketbooks. Shawn A. Prestridge Texas Instruments, Inc. Educational & Productivity Solutions 7800 Banner Drive MS 3908 Dallas, Texas 75251 (972) 917-1698 (972) 917-7103 FAX "He's back... Kicking bottom or what?!?!" --Holly, Red Dwarf