Across ten districts and eight years of data, student math achievement improved.
Here is what the evidence shows.

In site after site, ALN implementation produced a consistent two-year pattern. Instructional practices shifted in Year 1 as teachers began using Math Menu structures, formative assessment protocols, and conceptual frameworks built around High Leverage Concepts. Measurable student achievement gains followed in Year 2.

This pattern held across different geographic contexts, student populations, and assessment instruments. One notable exception: Keene School District, which invested a full year in coaching infrastructure before beginning classroom implementation, showed 24% district-wide proficiency gains in what was effectively their first implementation year. The evidence suggests that a robust planning year may compress the timeline.

Perhaps the most notable finding across sites: students who typically show the smallest response to instructional reforms showed the largest gains here. Students receiving special education services, students from economically disadvantaged backgrounds, and English language learners demonstrated accelerated growth compared to general education peers, across multiple districts, assessment types, and years.

This pattern runs counter to common findings where educational interventions produce the largest effects for already-advantaged students. The evidence includes:

• C.P. Smith Elementary, Vermont: students with IEPs achieved VTCAP math proficiency rates exceeding 50%, compared to approximately 18% statewide for comparable populations.

• Keene School District, New Hampshire: students from economically disadvantaged backgrounds showed a 35% proficiency increase, compared to a 24% district-wide gain.

• Winooski Public Schools, Vermont: English language learners in responding grade cohorts demonstrated statistically greater growth than native English speakers, in Vermont's most linguistically diverse district.

The evaluation suggests that ALN's emphasis on multiple representations, conceptual access points, and instruction matched to each learner's mathematical thinking may reduce the barriers that typically disadvantage these student groups.

Beyond whether achievement changed, the qualitative evidence examines how and why. Three factors consistently distinguished sites with stronger outcomes from those with weaker ones.

Embedded coaching alongside workshops. Sites that paired sustained instructional coaching with professional development workshops consistently outperformed sites that received workshops alone. Thompson School District's district-wide consistency, supported by monthly embedded coaching visits to all 23 schools, provides the clearest evidence.

Administrative support for depth over coverage. Teachers who received explicit backing from building and district leaders to prioritize conceptual depth over curriculum pacing showed stronger implementation and better student outcomes. Winooski's within-district variation tells this story directly: the grade levels with principal support for slowing down showed large gains, while the grade level facing pacing pressure showed no significant change, in the same district, with the same professional development.

Internal capacity built to last. Worcester County's six-year sustained improvement, well beyond active external support, coincided with the district's decision to train building-level coaches, revise benchmark assessments, and align pacing guides to High Leverage Concepts. When districts build internal systems that support the instructional model, improvement persists through staff turnover and leadership change.