The study used a randomized controlled trial to examine the effectiveness of PACT (Promoting Acceleration of Comprehension and Content Through Text) on middle school students’ reading comprehension and social studies knowledge. PACT is an inquiry-based instructional approach with five key components: Comprehension Canopy, Essential Words, Knowledge Acquisition, Team Based Learning (TBL) Comprehension Check, and TBL Knowledge Acquisition. Eighth-grade students from 27 classes participated in the study over 6-8 weeks. The results showed that students in the intervention group outperformed students in the control group on reading comprehension, social studies comprehension, and social studies knowledge outcomes.