An information system that is vital to the running of an organization. Tier 1 applications include enterprise resource planning (see ERP) and customer relationship management (see CRM).
"Tier 1 application." YourDictionary, n.d. Web. 16 August 2018. <http://www.yourdictionary.com/tier-1-application>.
Tier 1 application. (n.d.). Retrieved August 16th, 2018, from http://www.yourdictionary.com/tier-1-application