The entire object as a single box—a box with outer boundary arrows that link it to functions and resources outside the object. The single box is called the "top box" of the model. (The top box is assigned the node number A0.) Because the single top box of an IDEF0 model represents the object as a whole, the descriptive name in the box is shared. The same is true for the outer arrows of the model, because they represent the complete set of outer boundary conditions of the object as a whole, including access to the mechanism that provides additional means of execution.
Context diagrams A diagram that has a top block A0 represents algeria whatsapp number data the context of the model and is called a context diagram. The minimal context for a model is a special context diagram with node number A-0. An A-0 context diagram has only one top block named A0 with labeled outer arrows and text definitions of the Viewpoint and Goal of the model. (An A-0 diagram has no ICOM codes or tunneling on the free ends of the arrows.) Sometimes, however, in order to provide a more complete view of the external environment of the model context, an A-1 context diagram (which has the appearance of a normal, non-context diagram) is provided.
In an A-1 context diagram, block A0 takes the place of one of three to six numbered blocks (the other blocks retain their assigned numbers), so the effect is to provide a complete parent diagram (with three to six blocks) for the top model—nodes A1-A6 are still first-generation children. In the case where an A-1 context diagram is used, an A-0 context diagram is still provided. The A-0 diagram still has only one top block named A0, with labeled outer arrows and textual definitions of the Viewpoint and Goal of the model. Context diagrams are diagrams with node numbers of the form "An" (with a minus sign), where n is greater than or equal to zero.
An IDEF0 model begins by representing
-
- Posts: 103
- Joined: Tue Jan 07, 2025 4:41 am