1) E-Business Suite Diagnostics is a free tool from Oracle that helps gather and analyze information from an E-Business Suite system related to issues or setup configurations. It includes a set of diagnostic tests organized by product. 2) The tests examine collected information, provide feedback, and suggest resolution steps. This aids in problem avoidance, self-service resolution without Oracle Support, and reducing resolution time. 3) The tests are accessed through a web interface and do not make changes to the system. They are organized by product and functionality for easy use even by those without technical expertise.