Step $1$: Let$$s say we want to model a process in BPMN and the process induces some business rules. We will use the example of creating a bill. In order to create the bill, a discount needs to be computed. The sum of the order and the customer type are the relevant criteria to compute the discount.

Step $2$:

We want to model the following situation using BPMN $2\mathrm{.}0.$ For a request $($e$.$g$.,$ a payment$)$ two approvals of two different people are needed. A Process Engine should ensure that both approvals are fulfilled before the request is approved. The manual steps that are performed by the two approvers should also be modeled in the BPMN diagram. The approval decision is performed using a portal with a Tasklist.

Variations

Approver as Collapsed Pools

Step $3$: We want to model the following scenario using BPMN $2\mathrm{.}0$: let$$s assume a company receives orders from different distribution channels. One of these channels is a marketplace. Within certain intervals of time, the orders from the marketplace are fetched as a batch. Every order in this batch needs to be validated before being imported into the ERP System.