The stages containing the processes activities and tasks spanning the life of the system and/or product from the definition of its requirements to the termination of its use; life cycle covers its conception, design, operation, maintenance, support and disposal.
Source: IMO MSC.1/Circ.1512, Guideline on Software Quality Assurance and Human-Centred Design for e-navigation, 8 June 2015, International Maritime Organization. Regulatory Guidance
Life cycle include periods in which the facility or parts thereof are temporarily or permanently shut down.
Source: Guidance Notes on Petroleum and Natural Gas (Safety in Offshore Operations) Rules, 2008, Oil Industry Safety Directorate (India), 2012. Regulatory Guidance