This analysis uses the case of the Better Math Teaching Network (BMTN) to explore whether individuals participating in a networked improvement community (NIC) experienced common developmental trajectories on known dimensions of engagement. The analysis included quantitative data from annual network member surveys and qualitative data from annual member interviews. Evidence suggests potential developmental trajectories on three key dimensions of network participation: (1) learning how to engage in a network; (2) learning to use the tools of improvement science; and (3) learning to take up the theory of improvement. Additional findings show preliminary variations based on participant characteristics such as teaching tenure, whether they participated in the network with a colleague they knew prior to joining the network or with a school-based colleague, the context of their school, and how student centered they were at the outset of their participation.