The Evaluation Named One Factor. Here Is Why Current Science Points to Several, and What That Means for Your Child’s Support Plan.

What This Infographic Shows: Decoded for Parents

The infographic maps four findings that belong in every IEP meeting room.

The first is a myth correction. While traditional models describe learning challenges as stemming from a single isolated cause, current research, including the International Dyslexia Association’s 2025 definition specifically, describes the picture as a complex interplay of genetic, neurobiological, and environmental factors operating at the same time. The single-factor model is not older thinking that got quietly retired. It is still the architecture most authorization systems were built around.

The second finding names the medicalized view as the specific problem. Medical models of learning framed children’s struggles as fixed limits on ability, ceilings determined by what they were born with rather than by which systems had not yet received the right kind of instruction. The infographic draws a direct line between that framing and incomplete intervention plans.

The third finding is the one that tends to stop parents mid-sentence: a large majority of children with learning challenges are dealing with more than one contributing factor at the same time. Not a single isolated cause, but several interacting ones, with genetic predisposition, neurobiological processing differences, and environmental variables all shaping the same child’s experience simultaneously.

The fourth is the neuroplasticity connector. The brain physically reorganizes in response to targeted experience. That finding transforms the multi-factor picture from a complicated problem into a specific action map: each factor that is identified is also a lever that responds to the right kind of input. For the brain science behind that claim, see Living Proof: The Power of the Brain and The Multi-System Approach to Learning Success.

Why the Plan Your Child Received Addresses Only Part of the Picture

IEP authorization systems were built to find and document a single measurable gap, because a single documented factor is what generates a specific service code in the authorization process. A child whose profile includes phonological processing difficulties, working memory weaknesses, and processing speed differences gets evaluated against measurable thresholds in each area. The one that clears the bar gets the line on the IEP. The others often appear in the evaluation notes without generating their own rows on the support plan.

This is not a failure of the evaluators. The IDA 2025 definition explicitly recognizes that co-occurring challenges, including working memory, attention, and processing speed, are part of the same profile for a large proportion of children with learning differences. But the authorization system runs on single-factor documentation, so the plan that comes home often addresses only the most clearly documented piece. This is why the infographic names the medicalized view specifically as the thing to move beyond: medical-model framing answers the authorization question but not the planning question.

The research on environmental factors makes this gap concrete. Hill and Tyson’s 2009 meta-analysis in Developmental Psychology found that academic socialization, the specific way parents frame learning, model problem-solving, and set expectations at home, is the highest-leverage parent involvement variable for academic outcomes, outperforming event attendance and homework supervision across multiple studies. Environmental factors are the third leg of the IDA 2025 three-factor definition. They do not appear on the authorization form. They fall to the parent to identify and address precisely because the system has no mechanism for them.

For a closer look at how the IEP’s classification function differs from a multi-system planning tool, see What Does NLP Mean for Learning? and Multi-System Approaches That Change Learning.

Three Steps the Infographic Points to, With the Science Behind Each

The infographic’s parent action plan names three specific moves, each with a research connection.

The first move is to educate and advocate. Knowing the names and descriptions of all three factor types (genetic, neurobiological, and environmental) gives a parent the vocabulary to ask targeted questions at evaluation meetings and IEP reviews. Torgesen and colleagues (2001) found that intervention specificity matters more than intervention volume: the children who made lasting gains received instruction targeted at the right system at the right moment rather than more general exposure to more content. Knowing which factor the current plan addresses, and which ones it does not, is the starting point for that conversation.

The second move is to identify the interplay. No two children with the same diagnosis have the same factor profile. A child whose phonological processing is the primary documented factor, but whose environmental factor includes strong academic socialization at home, will respond differently to the same intervention plan than a child whose environmental factor has been less structured. The Learning Success Cognitive Processing Skills resource walks through how these factors interact in specific learning profiles.

The third move is to implement targeted support. Shaywitz and Shaywitz’s Yale fMRI research (2005) and Temple and colleagues’ Stanford imaging (2003) both confirm that the brain develops the same reading pathways as typical learners after intensive, targeted instruction that addresses the right systems. Not general enrichment, not more of the same exposure, but specific work on the specific factor. The neuroplasticity finding in the infographic is not a motivational message. It is a research result that tells you which lever to pull. For multi-system intervention strategies, see Unlocking Learning Potential: The Power of Neuroplasticity.

A screener is a starting point, not a diagnosis. If your child needs formal accommodations (an IEP or 504 plan), or you suspect a vision, hearing, or medical cause, pursue a professional evaluation as well. That is the only route to those supports. For a closer look at IEP goal-writing, see Crafting SMARTT IEP Goals.