Interleaving Unit Planner

What This Skill Does

Takes a blocked topic sequence (Topic A, A, A, then Topic B, B, B) and restructures it to interleave related but distinct concepts (A, B, A, C, B, A...), producing a sequence that exploits the interleaving effect to improve long-term retention and discrimination between similar concepts. The output includes the restructured plan, the rationale for interleaving these specific topics, and a briefing for explaining the approach to students. AI is specifically valuable here because interleaving requires identifying which topics benefit from interleaving (related but distinct concepts), which must stay blocked (genuinely prerequisite knowledge), and how to sequence the interleaving pattern — a task that requires understanding both the cognitive science and the specific subject content.

Evidence Foundation

Kornell & Bjork (2008) demonstrated that interleaving the study of different categories (as opposed to studying each category in a block) improved later classification accuracy by 30–40%, despite students rating blocked study as more effective. Rohrer et al. (2015) confirmed these findings in a real mathematics classroom: students who practised interleaved problem sets scored 25% higher on a delayed test than students who practised blocked problem sets. Taylor & Rohrer (2010) showed that the benefit of interleaving is especially strong for tasks requiring discrimination — knowing which strategy or concept to apply, not just how to apply it. Bjork & Bjork (2011) explain interleaving as a "desirable difficulty" — it makes initial learning feel harder and slower, but produces substantially better long-term retention and transfer. Critically, interleaving works because it forces learners to discriminate between similar concepts on every practice attempt, rather than knowing the answer type in advance because they're in a "block" of that topic.

Input Schema

The teacher must provide:

• Topics: The current sequence of topics, in the order currently planned. e.g. ["Fractions — addition", "Fractions — subtraction", "Fractions — multiplication", "Fractions — division"]
• Subject: Subject area and year group. e.g. "Year 8 Mathematics"
• Unit length: Duration of the unit. e.g. "12 lessons over 4 weeks"

Optional (injected by context engine if available):

• Prerequisite dependencies: Topics that must come before others. e.g. "Addition must precede subtraction"