Purpose

Schedule review of previously-learned concepts at expanding intervals to exploit the spacing effect. Manages due dates, adjusts intervals based on recall quality, and surfaces overdue items before they decay.

Activation

• Review session is due based on schedule. Learner initiates review. flashcards deck has due items. Sustained learning track (3+ sessions) needing interval maintenance.
• Skip if: one-shot session with no continuity. Concept not yet learned. Learner declines scheduling.
• Routing: overdue items take priority at session start. Coordinate with flashcards for card-level scheduling. Feed interval data to learning-memory.

Inputs

• Flashcard/item schedule with due dates, learner's current session, items from learning-memory.

Interval Algorithm (Simplified SM2)

Each item has an interval (days) and ease factor (EF, 1.3–2.5). Initial: 1 day → 3 days → then formula.