Developing a rich vocabulary repertoire in English is an essential achievement for young
learners acquiring English as a second language (ESL) as having a strong word knowledge
base supports the development of the four language skills in the second language. Most
studies on vocabulary learning, however, have been conducted with adult learners at the
college levels. The primary purpose of this study is to investigate the effectiveness of
different instructional techniques (incidental learning and intentional learning) on vocabulary …