“…Sets of brief, timed, parallel tests (or probes) are developed that sample from the content domain and produce scores that are validated for their assessment purposes. In general outcome measurement, tests are developed by either identifying robust indicators of curricular proficiency (e.g., the read-aloud measure developed and validated as part of curriculum-based measurement [CBM]; Deno, 488794A EIXXX10.1177/1534508413488794Assessment for Effective InterventionMooney et al Mirkin, & Chiang, 1982) or systematically sampling from the skills that comprise the annual curriculum (e.g., mathematics concepts and applications; Fuchs, Fuchs, & Zumeta, 2008) so that each test represents an equivalent snapshot of the grade-level curriculum (Fuchs, 2004). No matter the probe development approach, ongoing assessment using parallel forms of the curriculum domain is hypothesized to document student performance at a moment in time (performance) and/or growth over time (progress), offering data that are sensitive to instruction across time and, thus, formative in both design and practice.…”