If compact placement is enabled, no additional space is reserved for item nodes. Extended Functional Flow Block Diagram (eFFBD) eFFBDs show the interaction between system functions by distributing them along a timeline. It can also represent a cross reference between a system note/requirement and a specification or data definition or system that describes the objects symbols that it connects. A variant of the traditional FFBD representation, the EFFBD and its SysML cousin activity diagram are the most complete representations of behavior. Enhanced Functional Flow Block Diagram (EFFBD)[other]: A diagram based on the Functional Flow Block Diagram (FFBD), which was developed by TRW in the 1950s, representing complex flows in a simple way. In cases where there is a large amount of data flow, it can be helpful to hide data stores to focus attention on triggering data. engineering diagram, the Enhanced Functional Flow Block Diagram (EFFBD) [Long, 2002; Long et al., 1975; Skipper, 2003; Blanchard, 1990; Grady, 1993; Kockler, 1990; Oliver, Kelliher, and Keegan, 1997], and to the requirements for functional flow in UML-SE. eFFBDs are hierarchical. A Functional Flow Block Diagram is a popular graphical method. Shared function - a function that has a single description (in a function specification) and possibly its own decomposition into a hierarchy of lower-level diagrams (as for a function), but unlike functions and reference functions, all shared function symbols with the same name have a single, shared description and decomposition. Declares an Activity where the flow of tokens passes through its parameters continuously throughout the Activity's execution. New Node - drop onto a branch to insert a new function as part of the diagram decomposition (decomposed by), Nodes - drop onto the diagram background to insert an existing function as part of the diagram decomposition (decomposed by), Parallel - drop onto a branch to insert a new parallel construct (concurrency) with two branches, Select - drop onto a branch to insert a new select construct (exclusive OR) with two branches, Branch - drop onto a parallel or select construct to add a new branch as the last branch, Loop - drop onto a branch to insert a new loop construct, Loop Exit - drop onto the end of a branch within a loop construct to insert a new exit from the enclosing loop, Iterate - drop onto a branch to insert a new iterate construct, Replicate - drop onto a branch to insert a new replicate construct, Exit - drop onto the end of a branch to insert a new exit from this decomposition, Exit Condition - drop onto a function node to add an exit branch, New Input - drop onto any function node to create a new item that is input to the node, Inputs - drop onto any function node to relate an existing item that is input to the node, New Trigger - drop onto any function node to create a new item that triggers the node, Triggers - drop onto any function node to relate an existing item that triggers the node, New Output - drop onto any function node to create a new item that is output from the node, Outputs - drop onto any function node to relate an existing item that is output from the node, New Information Block - drop onto the diagram to insert an information block (a mini property sheet), New Note - drop onto the diagram to insert a new note (descriptive text in a note icon), New Shape - drop onto the diagram to insert a new shape (a rectangle, rounded rectangle, circle, or ellipse with text, if desired), New Graphic - drop onto the diagram to insert a new picture, Exit - drop an existing exit onto a function node to assign the exit as an exit condition (exits by), Function - drop an existing function onto the diagram background to relate it as part of the diagram decomposition (decomposed by), Item - drop an existing item onto a function node to relate it to the node using the input to, triggers, or output from relation, Resource - drop an existing resource onto a function node to relate it to the node using the captured by, consumed by, or produced by relation, All Entities - all classes and elements in the system model, allowing you to drag any element on top of a diagram node to establish relationships with the balance of your system model. Each construct has a precise definition that prescribes how control will be passed within the construct and when the construct itself will end. When a function appears multiple times in a system model or when the previous / next construct is complex, reference nodes can begin to branch showing all of the paths into and out of a given function's decomposition. The timeline effectively constitutes a flow of control. A special aspect of CORE's FFBD and EFFBD representations are reference nodes. Double-clicking on an iterate or a replicate allows you to specify the corresponding domain set. Model execution imposes physical constraints on the execution of the designed behavior. Represents a requirement or system note in a diagram and is a container within which other object symbols can be drawn or attached. Nested logic is used when determining the color for a constructs. Their connectivity is: Within a hierarchy of DFDs and possibly extended Function Block Diagrams (FFBDs), eFFBDs may be used to provide detailed information on order-critical parts of the system. This Time Line Loop contains the iteration condition, either at its start or at its end, depending on the type of loop that is required. For diagrams with a large number of data nodes, disabling compact placement will simplify diagram layout. Reference nodes reflect the context immediately surrounding this behavior. Other functions can be placed on these exit timelines, to perform corrective or exception handling behaviour. From this second Iteration Node, a Time Line Loop branches back to the first Iteration Node. The rounded rectangles on an EFFBD represent the items or the data interaction aspect of behavior. objects on eFFBD 1 will have numbers 1.1, 1.2, 1.3 etc., which are the numbers of the eFFBDs into which they may be expanded. It is Enhanced Functional Flow Block Diagram. EFFBDs also display resources - the third critical aspect of executable behavior. Individual parts of the timeline may be named or unnamed. A series of functions occurring over time in a predefined order. Extended Functional Flow Block Diagram (eFFBD) eFFBDs show the interaction between system functions by distributing them along a timeline. The processing along each branch is sequential unless that branch also contains nodes which instigate concurrent or other processing. Therefore, all instances (on any number of diagrams) of a shared function called, The order in which data and/or control signals arrive on diagram input flows, The states and transition logic in the State Transition Diagram (STD) of any control processes on the diagram, The order imposed by self-evident truths, such as a function cannot execute without its input data from the output of another function, or a store filled by another function, To allow functionality to be represented completely in terms of eFFBDs: this approach is practicable provided that control signals and states are not significant in the system, To allow an alternate view of functionality to be provided by allowing both DFD and eFFBD representations of the system. Causes its outgoing branch to be processed iteratively. Acts as an exclusive-OR operation. eFFBD is defined as Enhanced Functional Flow Block Diagram (engineering modeling) somewhat frequently. As an alternative, an operation may have multiple, labelled, outgoing branches, which converge at a Selection Node. When reference nodes branch, there are always an equal number of branches on the source and sink of the diagram. All the Time Line branches must subsequently converge at a matching destination Selection Node.

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