NuEditor is a tool suite supporting specification and verification of software requirements written in NuSCR. NuSCR extends SCR (Software Cost Reduction) notation that has been used in specifying requirements for embedded safety-critical systems such as a shutdown system for nuclear power plant. SCR almost exclusively depended on fine-grained tabular notations to represent not only computation-intensive functions but also timeor state-dependent operations. As a consequence, requirements became excessively complex and difficult to understand. NuSCR supports intuitive and concise notations. For example, automata is used to capture time or state-dependent operations, and concise tabular notations are made possible by allowing complex but proven-correct equations be used without having to decompose them into a sequence of primitive operations. NuEditor provides graphical editing environment and supports static analysis to detect errors such as missing or conflicting requirements. To provi...