The materials reviewed for Course 3 partially meet the expectations for Gateway 2: Rigor and Mathematical Practices.
The materials reviewed for Course 3 meet expectations for rigor and balance by providing a balance of all three aspects of rigor throughout the lessons. The Grade 8 instructional materials reflect the balances in the standards and help teachers to help their students meet rigorous expectations. They do this by helping students develop conceptual understanding, procedural skill and fluency, and application. The materials weakest section, but still enough quality representations to receive the "meets" rating, is on conceptual understanding. Students are able to work in groups to develop understanding, but then sometimes the narrative, in the text, scaffolds the work in such a way that the students are just walking through that understanding step by step.
The materials reviewed for Course 3 do not meet the expectations for practice-content connections. The materials attempt to incorporate the MPs in each lesson but all instruction of the MPs happens at the beginning of the Teacher Implementation Guide and never directly links the standards to the lessons using the MP vocabulary. This makes it extremely difficult for a teacher to reliably use the materials to know when MPs are being carefully attended to. The materials incorporate questions in which students have to justify and explain their answers, but no teacher supports are given which creates a lack of lesson structures for which students would discover their own solution paths, present their arguments, and justify their conclusion. Vocabulary is presented and almost always incorporated meaningfully into the lesson.
Overall, the materials partially meet the expectations for Gateway 2 in rigor and mathematical practices.