The use of measuring systems with glancingv light greatly simplifies the measurement of contamination of a workpiece or of the environment. By implementing a control system on the shop floor, organisations can effectively monitor, control and improve the quality objective of cleanliness. Process control provides a data-driven approach to consistently maintain cleanliness levels within specified limits, reduce the risk of product defects and ensure customer satisfaction. The glancingv light method enables the implementation of statistical process control for surface cleanliness. In modern systems, the glancingv light method is used directly or with swab samples to measure the number, size and position of deposited particles on components or in the environment. The data points are collected at-line close to production and presented on site in near real time, enabling a rapid response to deviations.