Quality management ensures quality throughout a product's life cycle. It involves quality planning, control, and improvement. Quality planning identifies requirements and procedures. Quality control inspects and tests products to identify defects. It focuses on fulfilling requirements. Quality assurance guarantees consistent results and that defects are avoided by focusing on providing confidence that quality requirements will be met. Quality management principles in standards focus on customer focus, leadership, employee engagement, process-based approaches, improvement, evidence-based decision making, and relationship management.