LEST — Work-condition & mental-load evaluation
A comprehensive, multi-variable ergonomic audit that evaluates physical strain, environmental factors, and mental workload simultaneously.
What is LEST?
LEST (from the Laboratoire d'Économie et Sociologie du Travail at France's CNRS) operates on the principle that workplace health cannot be evaluated by posture alone — high noise, repetitive tasks, low mental autonomy, and poor shift scheduling compound to accelerate fatigue. It converts floor measurements and structured worker interviews into a standardised 0–10 scale per variable.
When to use LEST
Use when performing a complete, top-down diagnostic review of fixed, low-to-medium-skill positions where physical stress and mental/organisational strain interact.
Primary citation: Guélaud, F., Beauchesne, M.N., Gautrat, J., & Roustang, G. (1975). Pour une analyse des conditions du travail ouvrier dans l'entreprise (LEST). CNRS, Aix-en-Provence.
What LEST assesses
The body segments and task variables evaluated in a LEST assessment.
What it assesses — 16 variables across 5 dimensions
- Physical environment (noise, space, climate)
- Physical load (static / dynamic)
- Mental load (time pressure, complexity)
- Psychosocial aspects
- Shift scheduling / time structures
Scoring and action levels
Final score range: 0–10 per variable
Developed by: Guélaud, Beauchesne, Gautrat & Roustang, 1978 (CNRS)
LEST is coming to Ergocure.ai
LEST is part of our validated method roadmap. Our engine adds new methods on shared infrastructure — when LESTgoes live it will run from the same on-device capture and certified-ergonomist review as our live methods. In the meantime, tell us your environment and we'll map the live methods that fit today.
Related assessment methods
Methods commonly used alongside LEST in a complete ergonomic assessment.
Be first to know when LEST lands
LEST is on our roadmap. Request a pilot of our live methods today, and we'll flag LEST the moment it goes live.