This document discusses calibration and qualification techniques that are important for quality assurance. It defines calibration as comparing a measurement to a standard to check for accuracy and consistency. There are different types of qualification including design, installation, operational, and performance qualification. Calibration is important to ensure instruments are providing accurate and reliable measurements over time. It should be performed regularly based on factors like accuracy needs, manufacturer recommendations, and instrument usage. Calibration helps control errors and improves measurement quality for pharmaceutical products.