Beginning with the well-known Infrastructure-as-a-Service (IaaS), Platform-as-a-Service (PaaS) and Software-as-a-Service (SaaS) structure, Gartner added in a Business and Information Systems layer that includes brokerages, management and security.

FORBES: Demystifying Cloud Vendors

Now, organizations can create a cross-department, enterprise-wide identity management process that provides a layer of intelligence to give enterprises the business insights needed to strengthen IT controls and reduce operational risk.

FORBES: Written by Kevin Cunningham