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Choosing a Primary School: What the Research Actually Shows

By Leon MoriguchiPublished May 13, 2026Updated May 18, 20266 min read日本語版あり
Audience
Parents of children ages 5–6

TL;DR

  • ·Private schools' higher raw test scores largely disappear once family socioeconomic background is controlled — the apparent advantage reflects who attends, not what the school does educationally
  • ·The home learning environment before any school-selection decision is made already accounts for a large share of later performance variation; school choice cannot easily replicate or negate that
  • ·The decision ultimately rests on questions no dataset resolves directly: commute sustainability, the fit between school culture and this particular child's temperament, and what neighborhood networks the choice forecloses

Contents

  1. Lead
  2. A Note on Japan's School System
  3. "Private Schools Have Higher Scores" — Is That the School's Effect?
  4. Why the Impression of Private-School Superiority Persists
  5. The Japanese Evidence
  6. What Else to Weigh
  7. Summary
  8. References

Lead

"Does private school actually produce better outcomes?" The question surfaces every spring as school application seasons open, and it carries the same shape of anxiety whether a family is seriously considering private enrollment or just wondering from the sidelines.

How much of the observed gap between private and public school performance is actually the school's doing? What do researchers say when they press on that question seriously? And what factors beyond academic performance belong in the decision? This article organizes what the evidence shows.

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