The OECD released its PISA 2025 results this week, and the topline finding is stark: average reading and mathematics performance across OECD countries has fallen to the lowest levels ever recorded since the assessment began, with reading scores dropping roughly 28 points across OECD countries since 2015, a decline researchers describe as equivalent to well over a year of formal learning. More than 760,000 fifteen-year-olds across 91 countries and economies took part in this cycle, making it the largest edition of the assessment to date, and the scale of the decline has drawn immediate, serious attention from education systems worldwide.

The report itself is notably direct about what's most at stake in this decline, stating plainly that the most troubling losses are in the very skills that matter most in an AI-saturated world: evaluating information, making connections across multiple sources, and thinking critically about what's being read. This isn't a generic literacy concern; it's a specific description of the analytical reading skills that underpin strong argumentative and research-based writing, which puts this data squarely in territory that writing teachers and departments should be paying close attention to this year.

It's worth being careful about over-interpreting a single international assessment as a verdict on any one classroom or district, since PISA measures a specific, internationally standardized skill set among fifteen-year-olds and reflects a complex mix of instructional, social, and technological factors accumulated over years, not a single school year's practice. But the scale and consistency of this decline, now extending a trend that predates the pandemic, makes it a genuinely useful signal worth factoring into instructional planning conversations this fall.

Why reading decline is a writing instruction problem too

Reading and writing skill are tightly, well-documented interdependent: students who struggle to read complex text closely and critically also tend to struggle to marshal evidence, evaluate sources, and construct sound arguments in their own writing, since both skills draw on the same underlying capacity to engage seriously and analytically with text. A generation of students showing measurable decline in critical reading, as this week's data suggests, is also a generation likely to need more deliberate, explicit support building the evidence-evaluation and source-integration skills that strong argumentative and research writing depend on.

• Treat this week's PISA data as a signal to reinforce close reading and source evaluation instruction, not just reading volume
• Connect reading comprehension support directly to writing instruction, since the two skills reinforce each other
• Build in explicit instruction on evaluating source credibility and synthesizing across multiple texts, skills PISA specifically flags as declining
• Avoid over-interpreting a single international data point as a verdict on your own classroom, while still taking the broader trend seriously
• Watch for more detailed national and state-level breakdowns as they're released in the coming months, which will offer more specific, localized guidance

What departments can realistically do with this data

A single week-old international report isn't a mandate to overhaul a curriculum overnight, but it is a timely, credible reason to prioritize the specific skills it identifies as most at risk: close, critical reading; evaluating and comparing multiple sources; and constructing well-supported written arguments from that analysis. Departments already planning curriculum priorities for the year have a genuine opportunity to use this data as concrete justification for protecting time on these specific skills, rather than letting them get crowded out by other pressures.

This is also a useful moment for departments to look at their own grading rubrics and ask whether evidence evaluation and source synthesis are weighted clearly and explicitly, or whether they're implicit, easy-to-overlook components buried inside a more general "uses evidence" criterion that doesn't give students or teachers a clear enough signal about how much this specific skill matters.

The conversation this data should start, not end

This week's PISA release is likely to generate considerable policy debate over the coming months about causes and solutions, screen time, instructional models, staffing, and more. For individual writing teachers and departments, the most immediately useful takeaway isn't waiting for that broader debate to resolve; it's using this data as a clear, current, credible reason to keep close reading and evidence evaluation squarely at the center of writing instruction this year.