This is a two phase design study of a methodology and tool called the Workflow Visualization System (WVS). It is used to produce intermediate representations of intended educational interventions and their actual implementation that: help researchers do design studies of learning interventions of dynamic, multi-dimensional classroom and online environments; and facilitate sharing of interventions for adaptation and reuse by educators and researchers. In an initial "messing about" cycle I tested workflow mining and data visualization concepts by creating "digital napkin sketches" of a workflow representation design and vetting them with my research team. In a second cycle I refined the system and built web-based, multi-layered, interactive prototype visualizations of five lessons in an undergraduate online course offered at the University of Wisconsin - Madison. The prototypes were used during the subsequent evaluation phase of my study. I used case study methodology and explanation building to analyze data collected from two distinct but related groups of users; my research team members, and senior researchers, designers, educators, and research project managers from Rutgers University. Results of analyses of meetings, simulations, and interviews indicate that: potential users could interpret the meanings of icons and workflows and felt they could create workflows of their own intended learning interventions; the tool would impact their research by providing large-grained views of data from the actual implementation of the intervention to identify areas for finer-grained analysis; open new areas of research by providing more organized contextual detail, and facilitate rapid comparison of interventions across different contexts. There was agreement that there needs to be a tool developed to easily create visualizations, automatically collect data during the implementation of an intervention, and annotate elements in the workflow with notes both as they design an intervention and after implementation. These, and other suggestions regarding user interface preferences, will be incorporated into the WVS in the next design cycle.