Scarborough’s Rope is probably the single most-cited image in the science of reading. The science behind this model isn’t the problem. The problem is that the language of the upper strands carries the vocabulary of research, not the vocabulary of the classroom.

Five strands, five teacher-facing names

Every concept Scarborough identified stays intact. Only the names change:

• Background knowledge → Knowledge
• Vocabulary → Words
• Language structures → Sentences
• Verbal reasoning → Inferencing
• Literacy knowledge → Discourse

Once a strand has a classroom-facing name, you can build a lesson around it, point to it in a student’s writing, and explain to a parent exactly what you’re working on and why.

How each strand grows from PreK to 3rd grade

• Words: Prioritize general academic vocabulary first. Layer in domain-specific terms, multiple-meaning words, and morphologically complex words as students are ready.
• Sentences: Complexity grows year over year, from causal connectors like because in PreK to transition words like as a result by 3rd grade.
• Discourse: Teach narrative first, then exposition.
• Inferencing: Climbs from basic cause-and-effect to multi-text comparison and authorial intent.
• Knowledge: Shifts from verbal associations in preschool to flexible, multi-step reasoning by 3rd grade.

The research is clear: the strongest programs teach all five strands together, across years. None work in isolation, and none can be skipped.