Tyrone manages a small lakefront shop that sells fishing tackle and boating gear. One of Tyrone$$s employees recently suggested that the shop begin to sell variety bags of $3$ or $4$ fishing lures. Tyrone implemented this idea and the shop now averages selling five variety bags each day. Tyrone$$s acceptance and implementation of the employee$$s idea shows that he embraces the $\_\_\_\_\_\_\_\_$ role.