Not yet included in the NIST taxonomy of Cloud Computing models is ‘BPaaS’ – Business Process as a Service.
Hopefully it soon will be, as although it is the lesser known and discussed of the Cloud categories, it’s the most powerful in it’s ability to directly impact short-term business transformation and perceivable business value to end-users.
Where IaaS provides virtual servers, PaaS the databases and other middleware and then SaaS for a category of software like CRM, as the name suggests BPaaS is the next layer up again, where the software is then tailored for a specific workflow and this is delivered as-a-Service.