This document discusses ITIL problem management. It defines a problem as an unknown cause of one or more incidents, while an error is a known cause. Problem management aims to prevent problems, eliminate recurring incidents, and minimize the impact of unavoidable incidents. It involves diagnosing incident causes, determining resolutions, and ensuring resolutions are implemented. Problems are categorized and documented in a known error database to improve incident response. Problem management works closely with incident management using similar tools and processes. The roles involved include the problem manager, technical groups, and third-party suppliers. Taking a formal approach to problem management provides benefits like improved service quality, reduced incidents, permanent solutions, organizational learning, and a better first-time fix rate.