ODCA Usage Model: Cloud Infrastructure Rev. 1.0
January 23, 2015
Grazed from ODCA. Author: Editorial Staff.
While the segregation of infrastructure resources into these three components is useful to a degree, they are more appropriately considered as a cohesive set of aggregate resources that can be purchased, provisioned, and managed as a whole. This is especially important as the lines between software as a Service (SaaS), Platform as a Service (PaaS), and IaaS blur.
SaaS offerings continue to add options and flexibility (thereby delving into PaaS); recently, the industry introduced the concept of IaaS+, which blurs the line between IaaS and PaaS by adding modular services on top of infrastructure services…
Read more from the source @ https://www.opendatacenteralliance.org/advanced-search-and-tools/advanced-search/infrastructure-workgroup/cloud-infrastructure