New Visions for Public Schools is in the third year of supporting a network of 18 New York City public schools to address uneven student success in Algebra 1. One of the ways New Visions is helping schools achieve greater equity in algebra is by supporting them to use a shared curriculum. But how is it known if the shared curriculum is making a change and leading to improvement? In the early months and years of enacting a new curriculum, teacher practice will be uneven, and school leaders may be uncertain if instruction is improving. To help leaders understand how the stages of implementation typically look and where their teachers are on that continuum, the network uses the Illustrative Mathematics Implementation Reflection Tool, a nonevaluative resource to guide classroom observations, reflection, and feedback about implementation. The tool supports educators across roles -- including teachers, coaches, school leaders, and district staff -- in navigating the predictable twists and turns of curriculum adoption and early implementation.