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The tiers below express Timeback’s instructional design priorities. They are a product framework, not a universal ranking established by the SDK or a claim that every deployed learning flow enforces these thresholds.

Tier 0: Non-negotiables

These must be in place before anything else matters.

Tier 1: Force multipliers

These amplify Tier 0 once the foundation is solid.

Tier 2: Context-dependent

These work under specific conditions.
Tier 0 is binary. You either have faultless communication, retrieval practice, and mastery gating, or you do not. No amount of Tier 1 or 2 optimizations can compensate for a broken foundation.