There are also independent consultants who act as interim executives with decision-making power under corporate policies or statutes. They may sit on specially constituted boards or committees. Consultants typically work at the site of the client on behalf of a consultancy or billing company. Some consultants are hired by companies to do work for them on a contractual basis. They are not employees of the company hired to carry out a specific task. They are expected to do their job responsibly with minimal supervision.