“…At both pre- and posttest, graph comprehension was assessed via a CBM Graph-Description Task. In previous research, the CBM Graph-Description Task has been shown to differentiate graph comprehension of (a) preservice teachers from that of CBM experts ( Wagner et al, 2017 ), (b) inservice teachers from CBM experts ( van den Bosch et al, 2017 ), and (c) teachers with higher ratings versus lower ratings on understanding and interpreting CBM graphed data ( Espin et al, 2017 ). As an example, in the study by van den Bosch et al (2017) , scores on the CBM Graph-Description Task for inservice teachers versus CBM experts were, respectively, 97.5% versus 100% for accuracy, 5.7 versus 8.3 for completeness, 51.7% versus 85% for sequential coherence, 1.7 versus 4.8 for data-to-data comparisons, 1.7 versus 4.1 for data-to-goal comparisons, and 1 versus 5 for data-to-instructional links (see following section for a detailed description of these variables).…”