<Dd> An activity is represented with a rounded - corner rectangle and describes the kind of work which must be done . An activity is a generic term for work that a company performs . It can be atomic or compound . <Dl> <Dt> Task </Dt> <Dd> A task represents a single unit of work that is not or can not be broken down to a further level of business process detail . It is referred to as an atomic activity . A task is the lowest level activity illustrated on a process diagram . A set of tasks may represent a high - level procedure . </Dd> <Dt> Sub-process </Dt> <Dd> 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 . A sub-process is referred to as a compound activity . </Dd> <Dd> Has its own self - contained start and end events ; sequence flows from the parent process must not cross the boundary . </Dd> <Dt> Transaction </Dt> <Dd> 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 . </Dd> <Dt> Call Activity </Dt> <Dd> 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 . </Dd> </Dl> </Dd>
<Dd> An activity is represented with a rounded - corner rectangle and describes the kind of work which must be done . An activity is a generic term for work that a company performs . It can be atomic or compound . <Dl> <Dt> Task </Dt> <Dd> A task represents a single unit of work that is not or can not be broken down to a further level of business process detail . It is referred to as an atomic activity . A task is the lowest level activity illustrated on a process diagram . A set of tasks may represent a high - level procedure . </Dd> <Dt> Sub-process </Dt> <Dd> 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 . A sub-process is referred to as a compound activity . </Dd> <Dd> Has its own self - contained start and end events ; sequence flows from the parent process must not cross the boundary . </Dd> <Dt> Transaction </Dt> <Dd> 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 . </Dd> <Dt> Call Activity </Dt> <Dd> 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 . </Dd> </Dl> </Dd>
what do rectangles with rounded corners in the bpmn model denote
what do rectangles with rounded corners in the bpmn model denote
activity
activity