Likewise, software as a service (SaaS), the "pay by
the drink" method of deploying applications, promises
many similar benefits but may be hard to accept.
Challenges exist not only for the software companies
planning a move to a SaaS business model, but for the
enterprises that must decide whether or not to give up
control over their applications. Enterprises want the
assurance that their application will be available
whenever they need it, wherever they need it, and at a
performance level they that they have come to expect.
In the case of network management, few companies are comfortable handing over control of their business
critical applications to an outside vendor.