Customer
In sales, commerce and economics, a customer (sometimes known as a client, buyer, or purchaser) is the recipient of a good, service, product or an idea - obtained from a seller, vendor, or supplier via a financial transaction or exchange for money or some other valuable consideration.
Experience
Experience is the knowledge or mastery of an event or subject gained through involvement in or exposure to it. Terms in philosophy such as "empirical knowledge" or "a posteriori knowledge" are used to refer to knowledge based on experience. A person with considerable experience in a specific field can gain a reputation as an expert. The concept of experience generally refers to know-how or procedural knowledge, rather than propositional knowledge: on-the-job training rather than book-learning.
Management
Management (or managing) is the administration of an organization, whether it is a business, a not-for-profit organization, or government body. Management includes the activities of setting the strategy of an organization and coordinating the efforts of its employees (or of volunteers) to accomplish its objectives through the application of available resources, such as financial, natural, technological, and human resources. The term "management" may also refer to those people who manage an organization.
Management
In the long-run the workman may be as necessary to his master as his master is to him, but the necessity is not so immediate.
Adam Smith (1776) The Wealth of Nations Chapter VIII, p. 80
Experience
Tu proverai si come sa di sale
Lo pane altrui, e com' è duro calle
Lo scendere e'l salir per l'altrui scale.
Thou shalt know by experience how salt the savor is of other's bread, and how sad a path it is to climb and descend another's stairs.
Management
In the past the man has been first; in the future the system must be first. This in no sense, however, implies that great men are not needed. On the contrary, the first object of any good system must be that of developing first-class men.
Frederick Winslow Taylor (1911) Principles of Scientific Management. p. 2