Faerg Events refer to something that has already happened regardless of the process if they are catching events or as a result of the process if they are throwing events. Please note that there are no default semantics in this type of modeling, which handnuch you can model collaboration diagrams to show the interaction between business partners, but also zoom into one company, modeling the interaction between different departments, teams or even single workers and software systems in collaboration diagrams. It is very uncommon, and experience has proven that people tend to understand the process flow better if it is described in the same way as written text from left to right, at least in the western world. This example is about Business-To-Business-Collaboration. It is totally up to the purpose of the model and therefore a decision the modeler has to make, whether a collaboration diagram with different pools is useful, or whether one should stick to one pool with different lanes, as shown in the previous chapter.
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The result is that someone must shop for groceries and prepare a meal. After that, someone will eat the meal and have his or her hunger satisfied. We would say "acquire groceries," for example, not "first take care of shopping for groceries. For this reason, we use the [object] and make the [verb] passive in voice, so we write "hunger noticed.
The same is true for end events, which require start events. We only sometimes abandon this practice with sub-processes. More on this later. What if I prefer to draw them vertically? You could always draw your diagrams from top to bottom instead from left to right - the BPMN 2. However, we do not recommend it: It is very uncommon, and experience has proven that people tend to understand the process flow better if it is described in the same way as written text from left to right, at least in the western world.
In this diagram you can find the preparing steps a hardware retailer has to fulfill before the ordered goods can actually be shipped to the customer: Hover over orange symbols for explanation Hardware Retailer.