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Quality Assurance (QA)
Quality Assurance (QA) is a proactive approach that aims to prevent defects from occurring in the first place.
Quality control
Quality Control (QC) is the process of inspecting products at specific stages of production to ensure they meet predefined quality standards.
Statistical process control (SPC)
Statistical Process Control (SPC) is a method that uses statistical tools to monitor, control, and improve production processes.