This document discusses various methods and systems for assuring food quality and safety. It begins by explaining that food safety is the most important aspect for consumers and producers must ensure safe food through implementing assurance systems. Common obligatory systems mentioned are Good Manufacturing Practice (GMP), Good Hygienic Practice (GHP), and Hazard Analysis and Critical Control Points (HACCP). Voluntary quality systems like ISO 9000 are also used. The document then provides more details on these various systems and how they work together to holistically manage quality and safety from production to consumption. It emphasizes that food safety is regulated by law while other quality aspects depend on consumer acceptance.