Two-day seminar on the use of TI-84 Plus Graphing Calculator for Mathematics and Science teachers has been held on 9^th-10^th March 2011 at the Katok Sixth Form Centre, Brunei Darussalam. Four representatives – Mathematics, Chemistry, Physics and Combined Science teachers and also MOE Officers from all 32 secondary schools attended this seminar to polish their knowledge and skills in using this technology in their learning and teaching process.