Sequence from low to high element interactivity

Start with elements that can be understood in isolation before introducing elements that must be understood together.

Why it works

Intrinsic cognitive load is determined by "element interactivity" — the number of elements that must be held in working memory simultaneously because they interact with each other. By sequencing from low to high interactivity, a teacher or learner allows schemas to form progressively, each level reducing the effective load at the next level. Violating this sequence — teaching high-interactivity material to novices — is a common cause of "I understand each part but can’t see how it fits together."

How to do it

1. Map the elements of a topic on a scale from "can be understood alone" to "requires other elements to make sense."
2. Teach or study the isolated-understanding elements first until they are fluent.
3. Introduce the first layer of interactivity (elements that depend on one other element) only after the isolates are solid.
4. Add complexity only when the prior level is automatic, not merely understood.

Evidence

Element interactivity is Sweller’s primary determinant of intrinsic load and is well supported in the CLT experimental literature. The sequencing implication (low before high interactivity) is endorsed by Sweller et al.’s work and consistent with worked-examples research. (rct)

Determining actual interactivity levels requires domain knowledge; the heuristic is most reliable when the instructor has genuine expertise in the subject.

Sources

• Sweller, Ayres & Kalyuga (2011), Cognitive Load Theory, Springer

Common mistake

Presenting a complete, realistic example of a complex topic to beginners because "that’s what it actually looks like," which overwhelms working memory before any schema can form.