Functional requirements define the basic system behaviour. Essentially, they are what the system does or must not do, and can be thought of in terms of how the system responds to inputs. Functional requirements usually define if/then behaviours and include calculations, data input, and business processes.

What is an example of a functional requirement?

“Any requirement which specifies what the system should do.” In other words, a functional requirement will describe a particular behavior of function of the system when certain conditions are met, for example: “Send email when a new customer signs up” or “Open a new account”.

What are functional requirements in project management?

Functional requirements are capabilities that the product must do to satisfy specific user needs. They are the most fundamental requirements. Functional requirements are sometimes referred to as business requirements.