Environmental Stress Screening (ESS) is a testing process that subjects products to accelerated environmental conditions to identify defects and weaknesses. This helps ensure the reliability of the product by uncovering potential issues that might arise during its operational life. ESS typically involves temperature cycling, vibration, and other stressors to simulate real-world conditions and enhance the product's robustness.

High Accelerated Life Testing (HALT) specifically targets the life span of a product by subjecting it to extreme conditions. This accelerated testing aims to identify and address potential issues that could affect the product's longevity, ensuring it meets robustness and durability requirements before entering the market. HALT is instrumental in enhancing the overall life span and reliability of a product through rigorous and accelerated testing protocols.

High Accelerated Stress Screening (HASS) excels in failure detection by subjecting a portion of manufactured units to intense stress conditions. This process aims to swiftly uncover latent defects or weaknesses that might lead to failures during the product's life span. By applying rigorous stress testing during manufacturing, HASS helps identify and rectify potential issues, ensuring that products reaching customers are robust and less prone to failures in real-world conditions.