Large law firms are organizations with 100 or more lawyers licensed to practice law in one or more jurisdictions. Most large law firms are organized as partnerships and comprise fee-earning partners (owners), associates (lawyers who may qualify for partnership in the future) and other professionals. They also include additional staff who support law practice and business operations. The prevailing business model is billing by the hour, and even firms that offer alternative fee arrangements typically continue to track hours billed. Large firms may have a single office or many, including offices on multiple continents.