Research Participants
The participants of this study were 120 students in Matthayom Suksa 4 at
Assumption Convent Lamnarai School, Chaibadan District, Lop Buri. The students
were classified into 4 programs, consisting of a class of Math-Science, a class of
Math-English, a class of English-French, and a class of English-Chinese. In each
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program, there were students with different English pronunciation abilities.
Therefore, 120 students of Matthayom Suksa 4 were asked to take the
pronunciation test in order to divide them into good and poor groups according
to their pronunciation ability. They had to read 30 words that ended with final /-l/
sound. Then, an English native speaker at Assumption Convent Lamnarai School
checked the students’ recordings. The students who could correctly pronounce
more than 10 out of 30 words were classified as a student with good
pronunciation ability. The students who correctly pronounced fewer than 10 out
of 30 words were classified as a student with poor pronunciation ability. It was
found that there were 48 students in the good ability group and 72 students in
the poor ability group. Then, 20 students from each group were randomly
selected, to be participants of the study. After that, students from both groups
learned how to pronounce the final /-l/ sound by using the CAI program.