Which service management process BEST helps information technology (IT) organizations with reducing cost, mitigating risk, and improving customer service?

Kanban is a visual management method focused on workflow optimization and continuous improvement, which is a tool within service management rather than a comprehensive framework for overall service delivery and strategic alignment.

Lean Six Sigma is a methodology focused on process improvement and defect reduction through statistical analysis, which serves as a technique for optimizing specific processes rather than a complete service management framework.

Information Technology Service Management (ITSM) is the general discipline or approach to managing IT services, while ITIL is a specific, widely adopted framework that provides the best practices for implementing ITSM, making ITSM itself too broad of an answer for a specific process/framework.

ITIL (Information Technology Infrastructure Library) is a globally recognized framework of best practices for IT service management, which directly enables IT organizations to reduce operational costs through optimized processes, mitigate risks by establishing clear governance and control, and improve customer satisfaction by delivering high-quality, reliable, and well-managed IT services aligned with business needs. It encompasses the entire service lifecycle, from strategy to continual improvement, providing a structured approach to value delivery.