In the restaurant business, there are chefs and there are line cooks.[2] Both can follow a recipe. When things go according to plan, there is no difference in the process or the result. But when things go wrong, the chef knows why. The line cook often does not. The chef has cultivated depth of understanding through years of experience, experimentation, and reflection, and as a result, the chef, rather than the line cook, can diagnose problems when they arise.[*]