Specify the flow of input masks by displaying the flow of user input tasks in the mask flow diagram and entering a mask and its fields for each user input task.
Mask flows often play an important role in requirements analysis. This is because users of an IT application in the operating department primarily use masks, dialogs or windows for communicating their requirements. The mask flow diagram extends the BPMN concept of a user task by enabling you to enter a mask for a task and to display the mask's fields within the task. Mask definitions and mask fields are not part of the BPMN specification.
You should use the mask flow diagram instead of a BPMN diagram if input masks play a role in the modeled process and it will make more sense if the relevant fields are visualized in the process. If you do not need this display and are more concerned with help using objects and their structures to model which data is processed by a task, then you should use the standard BPMN diagram.
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