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Research & evidence

Methods chosen on the strength of the evidence.

Project-based learning, spaced and retrieval practice, productive failure, concrete-to-abstract, and the Socratic method — drawn from the Engine of Trust research base.

Built on evidence, not authority.

Green Life's methods are drawn from the same research base behind The Engine of Trust — four decades of Kunzinger-family work in human factors and the behavioral sciences. We weigh every source on the strength of its evidence and its bias, not on who said it. Every method below is here because the research supports it.

Project-based learning

Integrated, project-driven instruction outperforms isolated, worksheet-based delivery for understanding and retention. The arc is the vehicle; the standards ride inside it.

Spaced & retrieval practice

Revisiting ideas across time and recalling them from memory beats re-reading. Our spacing engine schedules review so learning sticks.

Productive failure

Letting children struggle productively — try first, then refine — builds deeper understanding than being shown the answer up front.

Concrete → abstract (CPA)

Concrete experience, then representation, then abstraction. Children bake and grow real things before they generalize — in math and reading alike.

The Socratic method

Question before answer. Genuine inquiry — predict, test, reason — builds thinking that lasts, and protects the child's sense of control.

Attention & self-regulation

Children are taught what attention and motivation are, and how to manage frustration and take their own breaks — protecting focus instead of harvesting it.

The evidence standard

Every claim we make is rated for the strength of its evidence. We aim for the bar medicine uses — graded studies, discounted for the real world — and we hold our own methods to it. Where the research is mixed, we say so. We're even-handed, not cynical.

The full graded evidence base — the studies behind these methods, each rated for the strength of its evidence — is published here, drawn from the Engine of Trust research appendix.

Read the graded evidence base →

The engagement curve

The pattern we're built to reverse: traditional schooling tends to show engagement near 75% in third grade, falling toward 35% by eleventh grade. Our entire design — child-directed work, hands-on arcs, protected curiosity — exists to bend that curve the other way.

How the model works →   The graded evidence base   Read the Engine of Trust

For stakeholders

Bringing Green Life to a school, district, or program?

Green Life pairs an evidence-rated curriculum with a calm, child-directed delivery model. Administrators, funders, and partners can review the methodology, the research base, and the Texas ESA (TEFA) pathway — and share any of it with their teams in one tap.

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