Where should the following information be stored? 1. The experience of staff 2. Records of user behaviour 3. Supplier's abilities and requirements 4. User skill levels

The forward schedule of change records approved changes and their planned implementation dates, not organizational knowledge or people-related data.

The service portfolio tracks the full lifecycle of all services from pipeline to retirement, not staff experience or behavioral records.

The CMDB stores configuration items (CIs) and their relationships, focusing on technical infrastructure attributes rather than human or experiential knowledge.

The SKMS is the broadest knowledge store in ITIL, encompassing all data, information, and knowledge used to manage IT services. It explicitly includes experiential and behavioral data such as staff expertise, user habits, supplier requirements, and skill levels - information that goes beyond configuration data stored in more specialized systems.