{"id":9075,"date":"2026-09-01T08:27:59","date_gmt":"2026-09-01T08:27:59","guid":{"rendered":"https:\/\/www.learn-vp.com\/pl\/gallery\/mastering-bpmn-intermediate-events-catching-vs-throwing\/"},"modified":"2026-10-09T04:19:49","modified_gmt":"2026-10-09T04:19:49","slug":"mastering-bpmn-intermediate-events-catching-vs-throwing","status":"publish","type":"gallery","link":"https:\/\/www.learn-vp.com\/pl\/gallery\/mastering-bpmn-intermediate-events-catching-vs-throwing\/","title":{"rendered":"Mastering BPMN Intermediate Events: A Guide to Catching vs. Throwing Logic"},"content":{"rendered":"

\"BPMN<\/p>\n

In the world of Business Process Model and Notation (BPMN), precision is key to modeling real-world workflows accurately. One of the most critical elements for managing the flow of a process is the Intermediate Event<\/strong>. Unlike the start and end events that frame a process, intermediate events represent the dynamic occurrences that happen while the process is in motion.<\/p>\n

This tutorial breaks down the architecture of intermediate events, specifically focusing on the two fundamental orientations: Catching (Receiving)<\/strong> and Throwing (Sending)<\/strong>. By understanding these concepts, you can create models that accurately reflect waiting periods, decision points, and active communication.<\/p>\n

What Are Intermediate Events?<\/h2>\n

Intermediate events are circular symbols placed between the start and end of a process. They are visually distinguished by a double thin border<\/strong> around the circle, which sets them apart from the single-bordered start and end events.<\/p>\n

These events represent occurrences that take place during<\/em> the execution of a process. They act as the “middle management” of your workflow, handling the pauses, triggers, and data exchanges that occur between tasks.<\/p>\n

The Core Logic: Catching vs. Throwing<\/h2>\n

The behavior of an intermediate event is defined by its orientation. The diagram below illustrates how these events control the flow of an “Order Management Process.”<\/p>\n

1. Catching (Receiving) Intermediate Events<\/h3>\n

Catching events are passive in nature. When a process encounters a catching event, it pauses and waits<\/strong> for a specific condition to occur before it can continue.<\/p>\n

    \n
  • Behavior:<\/strong> The process flow stops at the event. Time may pass, or external data may need to arrive. The process remains in a “waiting” state.<\/li>\n
  • Visual Indicator:<\/strong> In BPMN, the arrow connecting the event to the next activity points inward<\/strong> (towards the event), symbolizing that something is being received.<\/li>\n
  • Common Examples:<\/strong>\n
      \n
    • Timer Events:<\/em> Waiting for a specific time to elapse (e.g., “Wait 3 hours”).<\/li>\n
    • Message Events:<\/em> Waiting for a reply or approval from an external system or user.<\/li>\n
    • Signal Events:<\/em> Waiting for a broadcast signal.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

      2. Throwing (Sending) Intermediate Events<\/h3>\n

      Throwing events are active. When a process reaches a throwing event, it actively generates or triggers<\/strong> something and then immediately continues to the next step.<\/p>\n

        \n
      • Behavior:<\/strong> The process does not stop. Instead, it executes an action (like sending data) and proceeds down the path.<\/li>\n
      • Visual Indicator:<\/strong> The arrow connecting the event to the next activity points outward<\/strong> (away from the event), symbolizing that something is being sent out.<\/li>\n
      • Common Examples:<\/strong>\n
          \n
        • Message Events:<\/em> Sending a shipping confirmation email.<\/li>\n
        • Signal Events:<\/em> Broadcasting an inventory update.<\/li>\n
        • Error\/Message Escalation:<\/em> Logging an alert or notifying a supervisor.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

          Case Study: The Order Management Process<\/h2>\n

          To visualize these concepts, let us analyze the “Order Management Process” shown in the diagram. This workflow demonstrates how a single process can utilize both types of events to manage an order from receipt to fulfillment.<\/p>\n

          The Catching Sequence<\/h3>\n

          The top section of the diagram illustrates the “Catching” workflow. After the process starts:<\/p>\n

            \n
          1. The process executes the task Review Order<\/strong>.<\/li>\n
          2. It encounters a Catching Timer Event<\/strong> labeled “Wait 3 hours.” Here, the process halts. It effectively puts the order on hold for three hours. Once the timer expires, the flow continues.<\/li>\n
          3. Next is a Catching Message Event<\/strong> labeled “Receive Approval.” The system pauses again, waiting for an external approval signal. Only when that signal is received does the process move to the decision diamond.<\/li>\n<\/ol>\n

            The Throwing Sequence<\/h3>\n

            The bottom section of the diagram illustrates the “Throwing” workflow, which occurs if the order is approved.<\/p>\n

              \n
            1. The process executes the task Prepare Shipping<\/strong>.<\/li>\n
            2. It hits a Throwing Message Event<\/strong> labeled “Send Shipping Confirmation.” The system actively sends a message to the customer and then immediately continues.<\/li>\n
            3. Immediately after, it hits a Throwing Signal Event<\/strong> labeled “Broadcast Inventory Update.” The system actively emits a signal to update inventory levels and then proceeds to the end of the process.<\/li>\n<\/ol>\n

              Summary<\/h2>\n

              Understanding the distinction between catching and throwing intermediate events is essential for building accurate BPMN diagrams. Remember the simple rule of thumb based on the visual flow:<\/p>\n

                \n
              • Catching = Pause & Wait<\/strong> (The process waits for an input).<\/li>\n
              • Throwing = Trigger & Continue<\/strong> (The process sends an output).<\/li>\n<\/ul>\n

                By applying these concepts, you ensure your process models reflect the true nature of business operations, balancing waiting times with active communications.<\/p>\n","protected":false},"excerpt":{"rendered":"

                Master BPMN intermediate events by learning the critical differences between catching and throwing logic to accurately model workflow pauses, triggers, and data exchanges.<\/p>\n","protected":false},"author":1,"featured_media":9076,"template":"","meta":{"_yoast_wpseo_title":"Mastering BPMN Intermediate Events: A Guide to Catching vs. Throwing Logic","_yoast_wpseo_metadesc":"Master BPMN intermediate events by learning the critical differences between catching and throwing logic to accurately model workflow pauses, triggers, and data 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