A kernel of every successful command of agile- development is a far-sighted, motivated and provided with large plenary powers proprietor of product, able to be not simply a manager, and member of scrum- command, ready to the close and permanent collaboration.Roman Пихлер, one of leading experts on Scrum and agile- management by a product, in the book examines all components of this role, necessary, to bring a company over to magnificent to the results.His book on that, the role of proprietor of product consists in what, with what typical complications and submarine stones he clashes in the work, how to overcome them, and also what agile- management by a product, based on Scrum, differs from traditional approaches and how effectively to apply scrum- techniques in practice.In Russian language published first.