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This paper organizes safety criteria, as given by Leveson, Jaffe, Heimdahl, Melhart, and Lutz, as a safety checklist for use on four-variable requirements models for real-time process-control systems. Special attention is given to the Software Productivity Consortium CoRE and Naval Research Laboratory SCR requirements specifications built on the four-variable model. The criteria are presented in English text and may be applied during the requirements engineering phase of software development to reduce safety-related software errors.