“…Building on our previous research regarding the effectiveness of SBI, delivered in a variety of settings to heterogeneous samples of students with various mathematical abilities (see Jitendra et al., 2015, 2018, 2019; Jitendra, Harwell, Karl, et al, 2021; Jitendra & Im, 2019), two studies examined the sustainability of the SBI teacher PD program in the achievement of desirable student outcomes and professional practice over time (Jitendra, Harwell, et al., 2016; Jitendra, Harwell, & Im, 2021). An important characteristic of Jitendra, Harwell, et al.…”