# Phase 4 Research: Progression

## Findings

Learner memory already stores the minimum evidence needed for progression:

- concept mastery state
- evidence references
- misconceptions
- review schedules
- interventions

The MVP progression surface can therefore be computed as a projection rather
than a new durable source of truth.

## Recommended Shape

- `internal/progression` owns readiness projection and challenge selection.
- `learnermemory.Service` remains the source for learner state.
- Readiness percentage should be simple and explainable.
- Challenge ladder should map readiness state to the next useful task:
  - unknown/fragile: define or recovery
  - improving: tradeoffs
  - interview-ready: design constraints
  - strong signal: interview pressure
- Boss unlock requires at least two stable concepts with evidence.

## Risks

- Too much gamification logic can become speculative. Keep it deterministic.
- Readiness percentages can feel fake if not traceable. Include evidence.
- Missing memory should return a normal 404, not invented progress.