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During software certification various forms of testing (e.g., unit, integration, regression) are undertaken. These testing processes are very important, but are also generally accepted as expensive, leading to a desire to replace testing with more cost-effective processes, where practicable. This paper is concerned with how such technology substitution can be justified, and presents a template for an argument that can be used to justify substitutions. It also instantiates the argument for a particular proof technology - the CLawZ toolset - and demonstrates how to argue for its safe substitution for testing in this context.