For more information on eligibility for employment-based nonimmigrant visas, see Nonimmigrant (Temporary) Work Visa Options. Your next step is determining how and where to apply for your visa; for more information, see Nolo's article Applying for a Nonimmigrant (Temporary) Visa or get the book U.S. Immigration Made Easy, by Ilona Bray (Nolo).
Statistical process control. Statistical process control (SPC) is the use of statistical methods to assess the stability of a process and the quality of its outputs. For example, consider a bottling plant. The entire system of production that produces filled bottles is termed a process.
There are two common classes of control systems, open loop control systems, and closed loop control systems. In an open loop control system, the control action from the controller is independent of the process output. A good example of this is a central heating boiler controlled only by a timer, so that heat is applied for a constant time, regardless of the temperature of the building.