sentences:  Like most enterprise software subcategories, ETS represents an evolution away from custom-made, in-house software development by original equipment manufacturers (OEM).It typically replaces a cumbersome, unsophisticated, test management infrastructure that manufacturers have to redesign for every new product launch.Some large companies, such as Alcatel, Cisco, and Nortel, develop ETS systems internally to standardize and accelerate their test engineering activities, while others such as Harris Corporation and Freescale Semiconductor choose commercial off-the-shelf ETS options for advantages that include test data management and report generation.