On March 22,  Mr. Sok Eng Leng, Principal for Preschool, Kindergarten and Elementary School and teachers of the American Intercon School got into 3rd grade "B" to do a teaching demonstration in Math about  "Time" taught by Ms Sreyneang Khon, a teacher at the American Intercon School, Choam Chao campus. The purpose of doing this is to share methods and experience in teaching, creating of teaching materials and improving the quality of teaching. Moreover, to make students understand and quickly grasp the lesson. After teaching demonstration, teachers have the opportunity to ask questions, solve questions, change methods, improve and fill in the gaps to be a vehicle and the key to their teaching more effectively and achieve the educational vision. 21st Century.