The article on which this paper reflects presented elements of a research project investigating learning interactions in online courses at two Australian universities. This paper revisits that earlier account of researching "classrooms without walls" by distilling and updating the authors' propositions and by examining these propositions' potential wider applicability. The twin foci of this examination relate to effective online learning designs and innovative cross-institutional research collaborations.In celebration of the 10 th anniversary of the Journal of Learning Design's first issue, this contribution offers reflections on an earlier article in the journal (Rossi et al., 2012). That earlier publication presented selected elements of a cross-institutional research project that analysed specific types of learning interactions in five online courses at CQUniversity and the University of Southern Queensland, Australia (for a comprehensive overview, please see the project report (Rossi, van Rensburg, Beer, Clark, Danaher, & Harreveld, 2013)). Three years after the publication of that article, it is timely to reconsider the article and the project to which it referred. Taking our cue from "What makes a good reflective paper?" (Walling, Shapiro, & Ast, 2013), after a summary of the earlier article, we cluster our revisiting of the "classroom without walls" notion that framed the special theme issue in which the article appeared around two themes: The earlier article (Rossi, et al., 2012) offered a preliminary report in respect of a research project that utilised social software and Web 2.0 technologies to explore online learning designs and interactions across five courses offered by two Australian universities. The authors acknowledged that online learning environments constituted a contemporary characteristic within Australian universities. These educational contexts were described as "classrooms without walls" and the authors contended that the effectiveness of these learning environments were dependent upon the quality of the interactions that they fostered. The authors emphasised the importance of rigorous research to ensure that these learning innovations delivered enhanced and sustained learning outcomes. The researchers also analysed the utility of the social software and Web 2.0 technologies that had been deployed to facilitate their collaborative research. Attention was drawn to certain constraints and tensions attendant on within-and cross-organisational learning, teaching and research activities, and the article recorded evidence of innovation in the investigation of both online learning designs and the research project developed to evaluate the effectiveness and impact of those designs.The issue of the requirements for effective online learning designs is even more significant than it was three years ago (Casey & Wells, 2015). Educational institutions are increasingly seeking to balance pressures to accept more students into programs with the need to maximise the quality of the learning experiences ...