This section deals with planning for a system at targeted user loads and scenarios for a specific point in time. The concepts in this section are appropriate for planning any initial installation the system needs at the two-year mark or any stage of a system life cycle. As such, this section refers to this as instance planning.
So many factors play into an enterprise system's performance (as noted in the introduction to this chapter) that estimation is exactly that, estimation. It is the best guess for hardware/architecture needs to support an estimated user volume, usage scenario set, network/hardware environment, and data complexity.
To plan for the needs of a system at any specific instance ...