To the best of our knowledge, this is the first multi-semester, two different control groups study on the effectiveness of CQGs in an ESL environment for engineering majors, possibly overall and particularly in the broader MENA context. The study has several specific contributions, which may be considered independently, or as mutually supportive of each other. Among these contributions are 10 CQGs (available upon request), tailored to the US-style freshmen engineering chemistry curriculum, and the