Lux is a fixed-form assessment in its current phase. That boundary is deliberate. Lux-specific adaptive-calibration work will wait until at least 500 eligible Lux responses exist. The required dataset is not yet available.
The number is a gate for beginning one stage of research. It is not a promise that every cohort will be calibrated once it reaches 500 responses, and it is not evidence that validation is complete.
What the gate actually protects against
Calibration work needs enough eligible Lux data to estimate item behaviour. Foundation Nova Diem has set 500 eligible responses as the minimum gate before that work begins. Crossing the gate would make a dataset eligible for analysis. On its own, it would not establish validity, fairness, population norms or fitness for use.
Until the gate is met, Lux remains fixed-form. Any future calibration study would still need a defined population, analysis plan, quality checks and conclusions limited to the evidence it produces.
Producing output is not the bar. Producing output that means what we say it means is the bar.
What happens before the gate is reached
The current Lux codebase contains a fixed-form, 19-layer scoring engine with versioned fields, committed fixtures and regression tests. These controls help the team detect unintended changes in computational output.
The inherited internal-consistency figures of α .800 to .898 come from complete ten-item Big Five banks in a 603,322-response source/reference dataset. Those are not Lux-participant responses. The figures do not establish Lux-wide validity or unconditional production readiness. Our public evidence position sets out those limits in full.
Lux’s active evidence-development programme combines technical testing now with staged empirical evaluation as suitable data becomes available. Test–retest work will assess score stability as repeat-response data becomes available. Other pre-defined studies will examine Lux-specific validity, norms, intended-population fairness and clinical utility.
What 500 responses will and will not change
Once the gate is met, a defined study can begin. That study will still need a specified population, an analysis plan, quality checks and conclusions limited to the evidence it produces. Other planned work will examine score stability, Lux-specific validity, norms, intended-population fairness and clinical utility as suitable data becomes available.
The 500-response gate is a prerequisite for one adaptive-calibration stage. It is not evidence that calibration or Lux-specific validation is complete. Eligible data makes a study possible. Participant volume alone does not establish reliability, validity, norms, fairness or utility.