“…Also, as the field's knowledge of new potentially influential factors grows, there is a consequential expansion of new researchable questions that can guide researchers' investigations towards a more refined, and presumably more accurate, body of research knowledge about students' justification schemes. For example, findings of investigations of new researchable questions RQ 3a and RQ 3b can contribute, respectively, to the development of content-specific (Dawkins & Karunakaran, 2016) and representationspecific (Stylianides, 2019) portraits of students' justification schemes, which in turn might help point out important trends that went undetected by prior research. At the same time, however, the field's research knowledge about students' justification schemes can become more fragmented: As research reports of content-and representation-generic findings give place to reports of content-and representationspecific findings, it is less justifiable for researchers to cluster together or even compare findings across studies that did not account for these factors.…”