Creation of Control Flow Diagram

Creation of Control Flow Diagram

To create a control flow diagram first remove all the data flow arrows from DFD. Events and control items are then added to the diagram. And a vertical bar is also added into the control specification. So control and process specification play important role.

Control Specification

Control specification contains a state transition diagram that is the sequential representation of the behaviour of the system. It also contains process activation table pat represents information contained in the STD in the form of process. It indicates which process will be invoked whenever an event occurs. It is like the manual of the STD.

Process specification

Process specification is used to describe all flow model processes that appear at the final level of analytical modelling. It includes text information in programs defined language, mathematical equations and charts. In other words it holds the algorithm of every process along with descriptive details.

Behavioural Modelling

Behavioural modelling is an operational principle for all requirement analysis methods. Very few tools such an s state transition diagram are used to represent the behaviour of the system to various external conditions and inputs. It graphically represents how a system in one state switches to another state on the action of external stimuli and control signals.

A state is any observable mode of behaviour. System states are represented by rectangles and arrows are used to represent transitions between states. Each  arrow is labelled as a ruled expression  A/B. Top  value represents the event  responsible for  the transition and  bottom value represents the  action that  occurs as a consequent of the event  during  transition.

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