This study considers a comparison of highly accelerated stress testing (HAST) with conventional reliability programs. Highly accelerated life tests (HALT), highly accelerated stress screens (HASS), and highly accelerated stress audits (HASA) are three major parts of HAST and accelerated methods which use stresses higher than the field environments to expose and then improve design and process weakness. HALT, HASS, and HASA techniques are explained comprehensively, HALT, HASS and HASA are compared with reliability growth tests(RGT), reliability stress screening (RSS), and sample RSS, respectively. HASTs are practical and efficient methodology to improve products reliability dramatically.