Acknowledgments
Work described in this commentary was supported by a grant from the Iowa Math and Science Education Partnership (IMSEP1-10-08) and research assistantships from the Department of Teaching and Learning at the University of Iowa and the College of Education at Michigan State University.
Notes
1Some researchers (e.g., CitationKrajcik, in press) have argued that learning progressions must include instructional guidelines: ideas about how to support students in moving from one level to the next. This is along the lines of arguments that learning progressions necessarily include assessments (e.g., CitationCorcoran, Mosher, & Rogat, 2009). While a package of materials accompanying a learning progression may include assessment prompts and/or instructional guidelines, I would argue that the learning progression itself is not required to include these.