AbstractOne of the plagiarism acts that commonly occur among undergraduates is the
unintentional plagiarism. This could happen due to their lack of knowledge on how to
write references correctly. Therefore, this study was conducted to investigate the
effectiveness of using the Educational Intervention (EI) (Smedley et al., 2015) to reduce
plagiarism act among ESL undergraduates (70 undergraduates) taking the PPU 6022
Academic Writing course at one of the private institutions in Perak. In this study, quasi-
experimental design was used to gather the quantitative data by using the Avoiding
Plagiarism Test (APT) and collection of exercises and assignments. Meanwhile focus
group interview was used to collect the qualitative data. The result of one way ANOVA
for the post-tests between the experimental group and the control group are
(F(1,68)=10.593, p=.002) for writing in-text citation, (F(1,68)=21.975, p=.000) for
paraphrasing and (F(1,68)= 8.011, p =.006) for writing a reference list u.....