Every Path page now shows the research behind it

October 27, 2026 · 2 min read

Every Path page now includes a section called The research behind this Path. It lists published studies about how students learn the subject, each with a citation linked to the source.

What you’ll find on each page

• Algebra Readiness and Algebra 1: research on why fractions matter for algebra, and on how students understand the equal sign.
• Algebra 2: research on why fractions matter for algebra.
• Geometry: the van Hiele theory of how geometric thinking develops, and research on how those levels relate to writing proofs.
• Biology, Chemistry and Physics: research on the ideas about the natural world that students bring to class, and on how those ideas change.
• ELA & Literacy: research on the strands of skilled reading, and on how background knowledge affects comprehension.
• English Language Learners and World Languages: research on academic language, on literacy for students learning English, and on what learners can do with a language at each level.

How to read it

These studies are about how students learn, not about SubjectPath itself. Each finding is attributed to its authors, and none of them is offered as evidence of what SubjectPath does. For the Paths that are coming soon, the research describes the ideas each Path will be built around.

For the full set of sources, and for the research behind the method as a whole, see The Science.

Why we added it

Algebra Readiness is built around ideas about how students learn its subject, such as fractions sitting underneath algebra, and each coming-soon Path will be built around ideas like those for its own subject: that geometric thinking develops in levels, or that students bring their own ideas about the natural world to science class. Showing the research on each Path page lets you see those ideas and the published work behind them, right next to the Path itself.

How the research is chosen

Every source is checked against its published record before it appears on the site, and each finding is written to match what the study reported. Sources we can’t verify are left out. Findings are attributed to their authors and kept separate from anything we say about SubjectPath, so it’s always clear which statements come from research and which describe our product.