In comparing the RCDs constructed by P3 in Figures The RCDs constructed by P4 were almost identical; however, different resources, such as stepwise versus concerted mechanisms, were activated in the individual interview prompts. Therefore, while key resources were activated, productive use was hindered by RCin both the Zaitsev and Hofmann, they constructed a stepwise RCD, yet selected a concerted 545 multiple-choice option. They never noted the disconnect in their representations and the multiple-choice options. Finally, students were not asked to identify the axes, but for the xaxis, reaction rate, reaction progress, time, and extent of reaction were observed, consistent with existing findings by Parobek and Popova regarding challenges students have with interpreting the meaning of the x-axis.