Designing appropriate materials and activities to enhance vocabulary learning is one of the primary goals of language courses. Among the claims about efficient pedagogical tasks is the Involvement Load Hypothesis (Laufer & Hulstijn, 2001) according to which vocabulary development is contingent on the amount of cognitive process a task involves. Building on the previous research on this hypothes...

  A growing body of research has indicated that students of ESL/EFL are reticent and unwilling to be engaged in oral activities in English lessons. Communicative language ability includes speaking ability, so vocabulary knowledge plays an integral role in speaking a language. However, there have been few studies examining the degree to which vocabulary knowledge affects speaking ability. The pr...