Действия, выполняемые одним исполнителем, на одном рабочем месте, единомоментно, моделируйте задачей, а не последовательностью задач и не подпроцессом.
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Вопросы, с которыми сталкивается каждый, кто моделирует процессы в BPMN: до какого уровня следует декомпозировать процесс? Надо ли показывать на диаграмме последовательность действий исполнителя при выполнении задачи?
Исключения возможны (см. ниже), но обычно этого делать не стоит, поскольку приводит к неоправданному усложнению диаграммы. Безусловно, подробные инструкции исполнителю полезны, но вместо того, чтобы размещать их на диаграмме, лучше создайте текстовое описание задачи. В нем вы можете дать пошаговые инструкции, чек-лист, ссылку на операционную процедуру и т.п. На уровне диаграммы сфокусируйтесь на координации задач, выполняемых разными исполнителями.
Качественные программные продукты для моделирования дают возможность ввести описание, а затем опубликовать диаграммы вместе с описаниями в виде документа или гипертекста. В качестве примера, вот как задается описание в Bizagi Modeler (исходный файл):
Логику задачи имеет смысл показывать на диаграмме, если она нелинейна - например, содержит развилки:
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