Represents a task that sends a message or signal to another process or participant.
Represents a task that waits for a message or signal to be received before proceeding.
Used when the work in the process cannot be broken down to a finer level .of detail
Represents a task that is performed manually by a human, but it is less specific than a User Task.
s
Represents a task that requires human interaction. It is typically performed by a knowledge worker or end-user.
Script Task
Diagram
A sub-process is a compound activity that represents a collection of other tasks
A specialized type of sub-process that is a group of activities that have no required sequence relationships
BPMN transactions are represented as special sub-processes, either collapsed or expanded