The pattern of restartable processes allows you to design model instances that can be restarted at any point and acquire the same execution status.
The pattern of agile processes allows you to design processes in which you can skip an Activity or a flow, and switch between Activities or flows as required without breaking your data.
To create a model instance over a record with your business data can be useful in the cases when you allow your users to create entities for documents: The user creates an shared record from a document, for example, an order, and on submit a new model instance takes care of further actions over the entity, such as processing the order.
To monitor the start of a model instance can help you to make sure that restartable model instances are in the correct status upon restart: The user adapts a restartable model so that the starting is monitored from the correct point and checks the starting on runtime from Management Console or Management Perspective.