How to Create a Functional Flow Block Diagram

The vector stencils library "Activities" contains 35 symbols for drawing business process diagrams (Business Process Model and Notation) using the ConceptDraw PRO diagramming and vector drawing software.
"An activity is represented with a rounded-corner rectangle and describes the kind of work which must be done. Task. A task represents a single unit of work that is not or cannot be broken down to a further level of business process detail without diagramming the steps in a procedure (which is not the purpose of BPMN). Sub-process. Used to hide or reveal additional levels of business process detail. When collapsed, a sub-process is indicated by a plus sign against the bottom line of the rectangle; when expanded, the rounded rectangle expands to show all flow objects, connecting objects, and artifacts. Has its own self-contained start and end events; sequence flows from the parent process must not cross the boundary. Transaction. A form of sub-process in which all contained activities must be treated as a whole; i.e., they must all be completed to meet an objective, and if any one of them fails, they must all be compensated (undone). Transactions are differentiated from expanded sub-processes by being surrounded by a double border. Call Activity. A point in the process where a global process or a global Task is reused. A call activity is differentiated from other activity types by a bolded border around the activity area." [Business Process Model and Notation. Wikipedia]
The shapes example "Design elements - Activities BPMN 2.0" is included in the Business Process Model and Notation solution from the Business Processes area of ConceptDraw Solution Park.