Knowing the difference between functional and non-functional requirements

Let's now take a look at the main type of requirements we are going to encounter and how we will be dealing with them. In the use cases and examples we have used so far, we have encountered requirements that influence what the system should do or how it should behave. In our pizza example, we talked about the actors selecting toppings for the pizza, choosing a delivery slot, and other such functionalities or behaviors. These are commonly known as functional requirements and we've already seen how we can represent these in a requirements model by identifying goals, stakeholders, capabilities, and features. But let's now consider some different requirements that don't focus on interactions between the system and its actors but on internal system operations instead: Non-Functional Requirements (NFRs).

Let's suppose that the pizza company wants our system to display all 50 available toppings...