ISO 9000 is a set of international quality management standards that have become popular for both large and small companies. The standards specify how management should conduct operations to ensure products and services meet predetermined quality standards. There are three models - ISO 9001 focuses on product design, production, and servicing. ISO 9002 focuses on production and installation. ISO 9003 focuses on testing and inspections. The certification process examines a company's quality management system and documents its quality control processes. While certification brings advantages like increased marketability, customer satisfaction, and operational savings, it also requires extensive documentation and a lengthy certification process.