Although the skills required are different, from a management viewpoint, sales is a part of marketing. Sales often form a separate grouping in a corporate structure, employing separate specialist operatives known as "salespersons" (singular: "salesperson"). Selling is considered by many to be a sort of persuading "art". Contrary to popular belief, the methodological approach of selling refers to a "systematic process of repetitive and measurable milestones, by which a salesman relates his or her offering of a product or service in return enabling the buyer to achieve their goal in an economic way".