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Introduction
The aerospace industry is experiencing exponential growth in the size and complexity of onboard software. It is also seeing a significant increase in errors and rework of that software. All of those factors contribute to greater cost; the current development process is reaching the limit of afforda-bility of building safe aircraft. The size with respect to source lines of code (SLOC) has doubled every four years since the mid-1990s; the 27M SLOC projected for 2010-2020 is estimated to exceed $10B.