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This article investigates how the use of a deliberate approach of analyzing a given reading may predict differences in CVA effectiveness. Sixty Arab EFL learners were randomly assigned to an experimental group and a control group, thirty participants for each. The experimental group received training in the deliberate Clarke and Nation (System 8:211-220, 1980) CVA technique, whereas the control group were not guided through a training method. Then, both groups were asked to answer three vocabulary tests and then participate to finish a series of six readings adjusted using Nation's K-level reading lexicon to control the difficult words during readings. After treatments, the students took a post-test vocabulary session. Results show that the group that have used the deliberate CVA technique retained about twice as many new words as the other group did. That is the use of a deliberate-CVA methodology significantly improves learning. The experimental manipulation produced a learning effect that was 76.1% greater than that of the control group in terms of word context recognition and 128.0% greater than that of the control group in terms of word definition accuracy. Pedagogical implications, limitations and directions for further research are discussed.