User-centric work space (UCS) service is a service capable of providing a personalized work space to its service users by orchestrating local and/or remote ICT resources [ITU-T Y.Suppl.42]. Based on the use cases of UCS service addressed by [ITU-T Y.Suppl.42], this Recommendation provides the requirements and capabilities of UCS service. The provided requirements and capabilities are necessary to implement various types of UCS services.