Has in-depth knowledge in their discipline and basic knowledge of related disciplines. Solves complex problems, often taking a new perspective or addressing issues without precedent. Works independently, receiving minimal guidance. May lead projects, project phases, or small project teams, and may formally train junior staff. Acts as a resource for less experienced colleagues. Uses best practices and knowledge of internal or external business issues to improve products, services, or processes. Represents a level at which a career may stabilize for many years or until retirement.