Stress screening is performed to ensure products subjected to extreme situations will survive. Stress screening of a product can mean several things. The most common stress tests are Burn-in testing, ESS (Environmental Stress Screening), HALT (Highly Accelerated Life Testing), and HASS (Highly Accelerated Stress Screening).

Burn-in: Burn-in testing forces electronic products to run for extended periods of time, revealing any failures that may occur over time with the product.

ESS: Environmental Stress Screening exposes products to conditions, such as thermal cycling and vibration, to inflict stress on the product and accelerate possible failures.

HALT: Highly Accelerated Life Testing is an extreme form of accelerated aging using rapid thermal cycling and multi-axial vibration to reveal any weaknesses that may occur in the product down the line.

HASS: Highly Accelerated Stress Screening is used to identify problems and weaknesses in the manufacturing process and is most beneficial when conducted as an add-on to HALT. HASS exposes the product to further temperature and vibration profiles to ensure its integrity.