CONTROL LIMIT Meaning and
Definition
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A control limit is a statistical term used to define the boundaries within which a process or a variable is considered to be in control and performing satisfactorily. It is a vital tool in quality control and statistical process control to ensure that a process is operating within set parameters.
Control limits are typically derived from historical data or calculated using statistical techniques. There are two main types of control limits: upper control limit (UCL) and lower control limit (LCL). The UCL represents the upper boundary or threshold beyond which a process is considered out of control and in need of corrective action. Conversely, the LCL represents the lower threshold where the process performance is considered unacceptable.
These control limits are usually represented on control charts, graphical tools used to monitor process performance over time. Control charts visually depict the observed data points, along with the calculated control limits. By comparing the data points to the control limits, it becomes possible to identify and investigate any deviations or patterns that may indicate an assignable cause that is affecting the process.
Control limits are crucial in ensuring product or service quality and performance consistency. By monitoring a process within these limits, organizations can detect and prevent deviations, identify areas for improvement, and ensure consistent output. Control limits provide a framework for decision-making, allowing organizations to take appropriate action in order to maintain desired levels of quality and efficiency.
Common Misspellings for CONTROL LIMIT
- xontrol limit
- vontrol limit
- fontrol limit
- dontrol limit
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- conrrol limit
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Etymology of CONTROL LIMIT
The etymology of the word "control limit" can be understood by analyzing the origins of its components:
1. Control: The word "control" comes from the Middle English term "controilen", which originated from the Old French term "contreroller". "Contre" means "against" or "opposite", and "roller" means "to roll". Initially, it referred to checking or verifying accounts by rolling a register against another. Over time, the meaning of control expanded to include the management, regulation, or supervision of something.
2. Limit: The word "limit" derives from the Latin term "limitis". It came into English through the Old French word "limite". "Limes", the Latin root, referred to a boundary or a frontier. In its modern usage, "limit" refers to the point beyond which something cannot proceed or exceed.
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