This paper describes how using simulation can help you dramatically reduce your preparation effort while simultaneously increasing your likelihood of certifying—the first time. It describes how Simics can help a firm certify faster by enabling them to develop, test, find and fix bugs sooner. This ensures the software is ready to go before deploying on actual hardware and going through the actual certification process. This paper specifically mentions DO-178C testing and gives an unnamed customer example of an aircraft electronics subcontractor. However, the concepts discussed in this paper apply to most any software development certification.