“…Along the dimension of analysis of student learning, we make the following contributions. First, while several frameworks for analyzing student reasoning of complexity have been proposed (Chi, ; Hmelo‐Silver & Pfeffer, ; Stroup & Wilensky, ; Wilensky & Reisman, ; Wilkerson‐Jerde & Wilensky, ; etc. ), we present a more nuanced analysis of the progressive refinement of children's explanations about ecosystems using the lens of mechanistic reasoning (Machamer, Darden, & Carver, ; Russ, Scherr, Hammer, & Mikeska, ).…”