Deutsch: Statistische Prozesskontrolle / Español: Control Estadístico de Procesos / Português: Controle Estatístico de Processo / Français: Contrôle Statistique des Procédés / Italiano: Controllo Statistico del Processo

In the quality management context, SPC, or Statistical Process Control, is a methodological approach used to monitor, control, and improve processes by tracking process data and using statistical methods. SPC helps in identifying variations in the process that may affect the quality of the end product or service. By distinguishing between natural (common cause) variation and variation due to specific causes (special cause), SPC allows organizations to take corrective actions to maintain and improve quality.


SPC involves the use of control charts and other statistical tools to analyze the performance of a process over time. These tools help in visualizing the process variability and detecting trends, shifts, or outliers that indicate a departure from the intended process performance. The primary goal of SPC is to achieve and maintain a state of statistical control, where the process operates predictably within set limits, ensuring consistent quality output.

Application Areas

SPC is widely applied across various sectors, including manufacturing, service industries, healthcare, and more, wherever there is a need to control quality through process management. Its applications include:

Well-Known Examples

Well-known examples of SPC application include:

  • In automotive manufacturing, SPC is used to monitor assembly line processes to ensure that vehicle components meet strict quality standards.
  • In the electronics industry, SPC helps in controlling the quality of circuit boards during the soldering process.
  • In hospitals, SPC charts are used to monitor the rate of hospital-acquired infections and implement measures to reduce them.

Treatment and Risks

The effective implementation of SPC requires a thorough understanding of statistical methods and the process being controlled. Misinterpretation of SPC data or improper use of control charts can lead to incorrect decisions, such as over-adjusting processes that are actually in control, leading to unnecessary variability. Therefore, training and competence in statistical reasoning and SPC tools are crucial for minimizing these risks.

Similar Terms or Synonyms

  • Quality control charts
  • Process monitoring
  • Statistical quality control (SQC)


Statistical Process Control (SPC) is a foundational tool in quality management, enabling organizations to monitor, control, and improve their processes through the use of statistical methods. By identifying and acting upon variations, SPC helps in ensuring that processes remain in control and produce consistent, high-quality outcomes. Its application spans various industries, demonstrating its versatility and effectiveness in promoting quality and operational excellence.


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