The document discusses key challenges and considerations for implementing an Information Security Management System (ISMS) based on ISO/IEC 27001. It highlights that ISMS implementation requires commitment from top management and involvement across the entire organization. Common difficulties include maintaining processes, continual improvement, and engaging employees outside of IT. Survey results show ISMS provides value through improved security and reduced costs, though certification can take 6-12 months and many organizations struggle with risk assessments and using all ISO 27001 controls.