Deming Cycle Change Management Model

Discuss the four sub processes of the Deming Cycle Change Management Model?
Define Modeling? and discuss the benefit of modeling used?
In the business process maturity model, how can an organization at level 1 be different from an organization at level 4 in terms of their characteristics?

Question Four
Create a process model for the following simple scenario using BPMN.
In an online shopping application, the following steps will be followed whenever a customer places a new order.
The shop receives an order from a customer to buy a product.
The availability of the product will be checked.
If the product is available, the order will be shipped to the customer.
If the product is not available, a request for the order will be sent to the supplier, then it will be shipped to the customer.