When eDiscovery became ubiquitous and law firms were regularly confronted with large numbers of files that required review using a combination of technology and an army of people, the industry of eDiscovery services started evolving. Instead of a law firm hiring contract attorneys as reviewers, they started engaging third party service providers to do the work. The early ALSPs focused on this type of work and the volume has only increased with increased number of files in discovery. Providers in the category include Epiq, Integreon.