Science of Reading Comprehension

The sixth episode in the Literary Insights series focused on what matters most in developing reading comprehension

Posted June 30, 2026
By Usable Knowledge

Reading comprehension is often described as a skill, but as Professor James Kim said in last week’s Literacy Insights conversation, students never just “read.” They always read something. What children understand depends not only on whether they can read the words on the page, but also on what they know about the topic, the vocabulary they can access, and how well they can connect ideas across sentences, texts, and experiences.

Kim’s discussion with Assistant Professor Phil Capin highlighted the importance of background knowledge, vocabulary, language comprehension, motivation, and aligned systems of curriculum, instruction, and assessment.

You can catch up on past episodes by watching our Literacy Insights YouTube playlist here.

Key Takeaways

Reading comprehension depends on what students are reading and what they already know.
Comprehension is not a single, isolated skill. Students are always reading something, and their ability to understand a text depends on the topic, vocabulary, background knowledge, and ideas they bring to it. A student may read the words accurately but still struggle to make meaning if the content is unfamiliar.

Word reading and language comprehension are essential for making meaning.
While students need to be able to decode words accurately and fluently, they also need vocabulary, background knowledge, verbal reasoning, syntax, and an understanding of how ideas connect across sentences and texts.

Vocabulary grows through connections, not isolated word lists.
Educators should think about vocabulary as networks of meaning rather than individual words to memorize. Students deepen their understanding when they learn how words relate to other words, concepts, and contexts. As Kim put it, students need to know “words by the company they keep.”

Students comprehend more deeply when they have a meaningful purpose for reading.
Developing student motivation can help students engage more fully with texts and ideas. It is important students have “missions” for learning, whether through debate, discussion, problem-solving, or questions that invite them to take a position and use evidence to support their thinking.

Strong comprehension instruction requires aligned systems, not just individual strategies.
Improving reading comprehension at scale requires alignment between curriculum, instruction, assessment, and professional learning. Schools need to consider not only what they intend to teach, but what is actually taught, and what is ultimately assessed. High-quality curriculum, paired with coaching and shared goals, can help create more consistent and meaningful support for students.