eng Science and Education Publishing American Journal of Educational Research 2327-6150 2020-10-21 8 10 779 786 10.12691/education-8-10-7 EDUCATION20208107 article Do Thi Thao thaodt@hnue.edu.vn 1 Vo Thi Kim Hue 2 Tran Thi Bich Ngoc 2 Faculty of Special Education, Hanoi National University of Education, Hanoi, Vietnam The Inclusive Support Development Center, Quang Ngai City, Vietnam The paper had some theoritical reviews and studied the implementation on how to use PEP 3 tool in early intervention for 3-4 year old children in specialized schools. Amount of 86 teachers and 63 parents with children with autism spectrum disorders was involved in the study. Research results showed that: (1) the 3-4 year old period was a golden to develop cognitive, thinking, language-communication development as well as form desirable behaviors; (2) Verifying the level function of a child was essential in order to then make a decision of the matching intervention program to the child with appropriate goals and strategies; (3) PEP 3 early intervention program was accessible to teachers and parents on both transition assessment as well as exercises and playing activities for children; (4) Teachers and parents were awared about goals, meanings, contents and methods of PEP 3 during the early intervention; (5) although there were some advantages in using the program, teachers and parents still have met some difficulties such as lacking of knowledge, materials and training courses to facilitate to using PEP 3. http://pubs.sciepub.com/education/8/10/7/education-8-10-7.pdf PEP 3 early intervention autism spectrum disorder (ASD) 3-4 year old chilren