For students in grades K–8, the diagnostic offers a differentiated growth model that is based on empirical research into the growth of millions of iReady students. This model provides two complementary measures of growth:

Typical Growth marks the annual growth of an average student at a given placement. It provides a comparative–or normative–view of growth, answering how students are growing relative to comparable peers.

Stretch Growth marks the amount of growth that a student should target in order to enter a path to attaining grade-level proficiency. iReady’s aggregated growth reports show student growth for a group. These reports are based on the median percent progress towards typical growth. Each student’s percent progress toward typical growth is determined by dividing their observed growth by their differentiated typical growth goal. All students in a class, school, district and by grade can be aggregated by taking the median percent progress towards typical growth.

The expectation is that the aggregation of students would have a median percent progress toward typical growth of 100 percent or greater to show that students have, on average, experienced a full year’s worth of typical growth.