Preliminary data of the biodiversity in the area VNU Journal of Science Education Research, Vol 37, No 4 (2021) 49 59 49 Original Article The Effectiveness of Applied Behaviour Analysis Training Program for Intervention Staff in Vietnam Tran Van Cong*, Nguyen Thi Hoai Phuong, Hoang Thi Thanh Hue VNU University of Education, 144 Xuan Thuy, Cau Giay, Hanoi, Vietnam Received 08 November 2021 Revised 04 December 2021; Accepted 05 December 2021 Abstract Applied Behaviour Analysis (ABA) is demonstrate[.]