Researchers examined seven schools in Alberta undergoing high school redesign, including the removal of the Carnegie Unit, a time-based metric for awarding course credits. A mixed methods convergent parallel design was used to gather data from leadership teams in the schools and to examine evidence of the impact on student learning. Qualitative and quantitative data were analyzed concurrently and then merged for the analysis. Findings illustrate that the removal of the Carnegie Unit was a catalyst for redesign and learning improvements. Five constitutive factors enable high school redesign, including: (1) a collective disposition as a learning community; (2) a focus on relationship building; (3) student input; (4) collaboration; and (5) changes to learning tasks and assessment practices. The findings provide insight into the ways in which leadership teams formed complex adaptive systems to enable change and may serve to inform practitioners and school leaders, schools and systems, and those who study policy changes in schools.