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NIST SP 800-82 Final Draft

Real-Time - Pertaining to the performance of a computation during the actual time that the related physical process transpires so that the results of the computation can be used to guide the physical process. [Falco, Joe, et al., IT Security for Industrial Control Systems, NIST IR 6859, 2003, http://www.isd.mel.nist.gov/documents/falco/ITSecurityProcess.pdf.]