 Inventors and R&D people create new tools and processes; but they do not disseminate into the business world (to do any economic good) without some amount of applications development, teaching (from exposing decision-makers via trade shows to providing workers with training), and sales.Many products and services purchased by large companies and institutions are highly complex.Examples include airliners, weapons systems, and IT systems (such as telecommunications, or databases and their dependent applications for purposes such as logistics or customer relationship management).