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Control may be grouped according to three general classifications: [3] the nature of the information flow designed into the system (open- or closed-loop control) the kind of components included in the design (man or machine control systems) the relationship of control to the decision process (organizational or operational control).
Walter A. Shewhart described manufacture under "control"—under statistical control—as a three-step process of specification, production, and inspection. [9]: 45 He also specifically related this to the scientific method of hypothesis, experiment, and evaluation. Shewhart says that the statistician "must help to change the demand [for goods ...
For continuously modulated control, a feedback controller is used to automatically control a process or operation. The control system compares the value or status of the process variable (PV) being controlled with the desired value or setpoint (SP), and applies the difference as a control signal to bring the process variable output of the plant ...
Process efficiency can be enhanced by reducing the margins necessary to ensure product specifications are met. [11] This can be done by improving the control of the process to minimize the effect of disturbances on the process. The efficiency is improved in a two step method of narrowing the variance and shifting the target. [11]
The instruction cycle (also known as the fetch–decode–execute cycle, or simply the fetch–execute cycle) is the cycle that the central processing unit (CPU) follows from boot-up until the computer has shut down in order to process instructions. It is composed of three main stages: the fetch stage, the decode stage, and the execute stage.
[3] A control chart can be useful during the Control stage to assess the stability of the improvements over time by 1. serving as a guide to continue monitoring the process and 2. providing a response plan for each of the measures being monitored in case the process becomes unstable. Standard operating procedures (SOP's) and Standard work
Control built within a process is internal in nature. It takes place with a combination of interrelated components – such as social environment effecting behavior of employees, information necessary in control, and policies and procedures. Internal control structure is a plan determining how internal control consists of these elements. [3]
The U.S. Navy summarizes the time-critical risk management process in a four-step model: [4] 1. Assess the situation. The three conditions of the Assess step are task loading, additive conditions, and human factors. Task loading refers to the negative effect of increased tasking on performance of the tasks.