A process is an activity or series of activities that converts an input to an output by doing work.
Hierarchy of Process levels:
Processes can be described at different levels. A typical four level hierarchy is:
1) High Level: A top level description of a major business activity, e.g. “New product development”.
2) Key Process: A key process is an expansion or a “break-out” of one of the process steps described at high level. A key process should still be described in relatively general terms.
For example, the key process of “Launch new Product” could be:
3) Activity: This is the next expansion of each step in the key processes. For example, the activity of “Prepare Sales Literature” could be:
4) Task: A task level process relates to each step in the activity level process. For example, the tasks involved in “Design Brochure” could be: