functional-design

To create a functional design document, use a standardized template to define feature scope, user flows, and domain models based on product requirements. This ensures clarity and consistency when outlining software features for new development scenarios.

Functional design specifically differentiates from software architecture by focusing on defining feature scope, inputs, outputs, and responsibilities rather than structural system design. It structures user flow definition and feature decomposition instead of technical infrastructure.

A functional design document should include quality standards and best practices that ensure clarity and consistency in defining software features. These criteria guide the structured decomposition of features and the definition of user flows and domain models.

Yes, you can use a functional design template for changing existing features, as it supports both new feature creation and change scenarios. It structures feature decomposition and user flow definition to clearly outline modifications to existing software.

You need a functional design document instead of screen specifications when you must define the scope, inputs, outputs, and responsibilities of software features. It explicitly differentiates functional design from screen specifications to focus on overall feature behavior and domain models.