Also a technique for testing, analysis, or. training in which real-world systems are used, or where real-world and conceptual systems are. reproduced by a model (reference b: 'DoD modeling and Simulation (M&S) Management,'. January 4, 1994) DOD M&S VV&A.
Where it's from: Skirt steak is a thin, long cut of beef from the diaphragm muscles of the cow. It is also lean and contains a lot of tough fibers. Flavor and texture: Skirt steak has even more intense beefy flavor than flank steak.
Chuck steak is  a cut of beef and is part of the sub primal cut known as the chuck. The typical chuck steak is a rectangular cut, about 1 thick and containing parts of the shoulder bones, and is often known as a 7-bone steak, as the shape of the shoulder bone in cross section resembles the numeral '7'.