99VNU Journal of Foreign Studies, Vol 36, No 4 (2020) 99 112 THE EFFECTIVENESS OF VSTEP 3 5 SPEAKING RATER TRAINING Nguyen Thi Ngoc Quynh, Nguyen Thi Quynh Yen, Tran Thi Thu Hien, Nguyen Thi Phuong Thao, Bui Thien Sao*, Nguyen Thi Chi, Nguyen Quynh Hoa VNU University of Languages and International Studies, Pham Van Dong, Cau Giay, Hanoi, Vietnam Received 09 May 2020 Revised 10 July 2020; Accepted 15 July 2020 Abstract Playing a vital role in assuring reliability of language performance assessmen[.]