Software as a Service

Over and above the IaaS bene ts described in the preceding are those of Software as a Service (SaaS). In the SaaS model, a vendor takes responsibility for not only infrastructure, but also for all of the processes required to manage an entire application solution (patches, upgrades, backups, database management, systems tuning, performance management, etc.). Because SaaS vendors manage many customers on a small number of application instances, they can amortize infrastructure costs over many customers. In other words, the inherent savings of IaaS are compounded when many agencies share a single system.