In the last post we postulated that business value is created by users running applications which provide value added transformations of data. Users need three things from applications:
Of course, applications depend on the entire IT infrastructure.
Let’s look at these in more detail.
Availability means that the user can use the application when they need to – that the application, data, and IT infrastructure work together to allow the user to generate business value.
Performance means that the application has an acceptable response time to user requests. “Acceptable response time” depends on the context. For a large simulation job, multiple hours may be entirely acceptable. For many interactive operations, instantaneous is acceptable. For example, when entering data into a form, there should be no delay in echoing user input and in moving from one field to the next. In general, performance needs to be at a level where the user is productive and not frustrated with the system.
Integrity can have multiple meanings. In fact, integrity deserves a post of its own.