Design Control Measures (DCMs) – The application of a formal methodology to the conduct of product development activities. Latent Software Defect – Undetected errors in functional requirements, software design, or software implementation. Process Discipline – Strict adherence to approved and documented methodologies and processes. Random Failure – A failure occurring at a random time, which results from one or more of the possible degradation mechanisms in the hardware [IEC 61508-4, Section 3.6.5]. Safe Design Objective (SDO)– Objective criteria for addressing the potential fora software defect being introduced during the software development and integration processes. Safety Classification (Classes) – An assignment based on functionality and safety significance. Different safety classifications (classes) require different levels of requirements (e.g., Class E versus non-Class E, or safety-related and non-safety-related). Software – The programs used to direct operations of a programmable digital device. Examples include computer programs and logic for programmable hardware devices, and data pertaining to its operation IEEE 7-4.3.2-2016].
