(ISO) A file that is part of a collection of files set aside for later research or verification, for security purposes, for historical or legal purposes, or for backup. (IEEE) Analysis of the safety-critical design elements affected directly or indirectly by the change to show the change does not create a new hazard, does not impact on a previously resolved hazard, does not make a currently existing hazard more severe, and does not adversely affect any safety-critical software design element. A facet of reliability that relates to the degree of certainty that a system or component will operate correctly. (ANSI) The aids provided for the understanding of the structure and intended uses of an information system or its components, such as flowcharts, textual material, and user manuals. Equipment within the system is kept in step on the basis of this timing. (ISO) A limit check in which both high and low values are stipulated. This and other terminology used by the FDA are updated and made available for download via the NCI File Transfer Protocol (FTP). Contrast with demodulation. (IEEE) A value whose definition is to be supplied within the context of a specific operating system. See: block diagram, bubble chart, flowchart, graph, input-process-output chart, structure chart. (NBS) Test data that lie within the domain of the function represented by the program. Integration testing is then conducted on the program as a whole. pixel. Approximately one billion bytes; precisely 230 or 1,073,741,824 bytes. Contrast with design standards, requirement. Testing designed to challenge a system's ability to manage the maximum amount of data over a period of time. formal qualification review. (NIST) A specification that documents the requirements of a system or system component. A measure of the reliability of a computer system, equal to average operating time of equipment between failures, as calculated on a statistical basis from the known failure rates of various components of the system. Contrast with subroutine. It strives to combine the power of assembly language with the ease of a high-level language. A technique for error detection to ensure that data or program files have been accurately copied or transferred. (IEEE) An assembler that executes on one computer but generates object code for a different computer. (ISO) Documentation that describes how to use a functional unit, and that may include description of the rights and responsibilities of the user, the owner, and the supplier of the unit. A name, label, quantity, or data item whose value may be changed many times during processing. octal. (2) Evaluation of the data structure and usage in the code to ensure each is defined and used properly by the program. See: anomaly, bug, error, exception, fault. Data is transmitted and received in serial format. Often part of a requirements specification. (IEEE) The inability of a system or component to perform its required functions within specified performance requirements. configuration identification. software safety change analysis. Selection of the level may be based on project cost, intended usage, extent of effort, or other factors; e.g., level of concern. Zmodem. (IEEE) An element of configuration management, consisting of the evaluation, coordination, approval or disapproval, and implementation of changes to configuration items after formal establishment of their configuration identification. (IEEE) The ability of a system or component to perform its required functions under stated conditions for a specified period of time. Which pose the greatest chance finding of errors character used to communicate with computers language and natural language to! 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