Activities
An activity is a unit of work that is executed within a business process; it can be atomic or non-atomic (Compound activity, Call activity, or Subprocess). Activities can be of the Task, Call activity, or Subprocess type.
Task
A task is the smallest atomic activity unit that can be included within a process. Usually, the performer of the task can be an end user (called human) using a UI-based application, a participating external service, or a generic set of business statements. Tasks have their local scope and can accept input parameters from their container and return output parameters.
User Task
A user task is used to model work that needs to be done by a human actor. When the process execution arrives at the user task node, a new task ...
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