System Science
One loop. Capture → Compute → Adapt.
Every rep in the arena runs through the same loop: we capture your response with timing and speech detail, compute a new ability score with our IRT engine, then adapt the next drill and telemetry instantly. That’s why progress feels visible instead of random.
1. Capture
Every answer logs accuracy, timing, hesitation, and speech fluency directly from the arena question card.
2. Compute
The same IRT rating model used in the arena recomputes your score and skill vector deltas in under a second.
3. Adapt
Branching logic selects corrective, similar, or stretch questions and pushes updates to the Sidebar telemetry panel.
How it adapts
Dynamic branching every 90 seconds.
When you submit a response, the Arena computes a new ability estimate, scans your fatigue markers, and selects the next best rep. The system can pivot to intercards, review cards, or harder drills without a human coach in the loop.
- 01
Signal ingestion
Accuracy, speed, hesitation, and speech fluency flow into the model.
- 02
Branch selection
We choose from corrective, stretch, or consolidation paths.
- 03
Live narrative
Intercards surface milestones and redirect focus instantly.
Stack
Inference Engine
IRT-based difficulty tuning recalculates after every submission.
Content Graph
Questions are clustered by linguistic features to deliver natural progressions.
Speech & Writing AI
On-device transcription paired with fine-tuned evaluators for TOEFL rubrics.
Session Orchestrator
Queues micro-drills, full sections, or diagnostics depending on fatigue and goals.
Proof it’s real
The UI elements you see are wired to the model.
Nothing in Arena is cosmetic. When the Est. Score jumps or a skill bar nudges upward, it’s because the algorithm recalculated your ability using the latest response.
Update Cycle
~90 sec
Signals
4+ per rep
What you feel
Every feature fixes a specific pain.
Live Score Tile
The Est. Score block in the arena UI is the real IRT estimate—no animation, just math updating every rep.
Sidebar Telemetry
Thirteen skill bars update immediately so you can watch Reading Detail or Speaking Delivery move in real time.
Milestone Intercards
Hit a streak or fix a weakness and the system pauses the drill with an intercard that explains why.