Lightning can occur between opposite charges within the thunderstorm cloud (intra-cloud lightning) or between opposite charges in the cloud and on the ground (cloud-to-ground lightning). Lightning is one of the oldest observed natural phenomena on earth.
SYSTEM TESTING Fundamentals. DEFINITION. System Testing is a level of the software testing where a complete and integrated software is tested. The purpose of this test is to evaluate the systemâs compliance with the specified requirements. Definition by ISTQB. 1  system testing: The process of testing an integrated system to verify that it meets specified.
A system, from the standpoint of pressure testing, can be defined in different ways. In context it can refer to: 1. A test circuit, which is an installed segment of a piping system, including all pipe, fittings and components that have been delineated and identified on some document such as a flow diagram.