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Functional vs Non Functional Requirements

Sandhuya Sharma
3 min readDec 12, 2024

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When building software, capturing requirements accurately is crucial to delivering a product that meets user expectations and business goals. These requirements are broadly categorized into functional and non-functional requirements. While they serve different purposes, they work together to define the overall behavior and quality of a software system. Here’s a closer look at both.

1. Functional Requirements

Definition: Functional requirements specify what a system should do. They define the features and functionality of the software, describing how the system behaves in response to inputs or interactions.

Key Characteristics:

  • Focus on what the system does.
  • Define specific inputs, processes, and outputs.
  • Directly aligned with user needs and business objectives.
  • Typically documented as use cases, user stories, or system requirements.

Examples:

  • A user must be able to log in using a username and password.
  • The system should send an email confirmation when a user registers.
  • A search feature should allow users to filter results by date.
  • The application must allow users to upload and download files.

Documentation Format: Functional requirements are often captured in a Software Requirements Specification (SRS) document and…

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Sandhuya Sharma
Sandhuya Sharma

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