Activities represent specific tasks performed in a Process by a person or a system. Activities can occur once, multiple times or when a set of conditions are met. They’re the executable elements of a Process.
Activities can be atomic or non-atomic.
Atomic activities represent a single unit of work that can’t be broken down further. Tasks are atomic activities.
Non-atomic activities can be broken down into finer levels of detail. They contain a set of activities and a logical sequence. Processes and Subprocesses are non-atomic activities.
Activities fall into three categories: