Quality assurance and quality control play important roles in the pharmaceutical industry to ensure product safety and efficacy. Quality assurance focuses on preventing defects through process improvement and monitoring, while quality control identifies defects through testing of raw materials, in-process materials and finished products. Both functions are necessary to consistently deliver high quality products that do not compromise consumer health. Key responsibilities of quality assurance include overseeing quality systems, monitoring validation activities and investigating issues like deviations. Quality control responsibilities involve testing, method validation, complaint investigation and stability studies. Together quality assurance and quality control form a quality culture from design through manufacturing and distribution.