Variables in Practice. An Observation of Teaching Variables in Introductory Programming MOOCs - van der Werf, V. (author); Zhang, Min Yi (author); Aivaloglou, E.A. (author); Hermans, Felienne (author); Specht, M.M. (author); van der Werf, V. (author); Zhang, Min Yi (author); Aivaloglou, E.A. (author); Hermans, Felienne (author); Specht, M.M. (author) (2023)