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System Requirments

System requirements are features and functionalities that are used to create a software solution in practice. They can be functional and non-functional.

Understanding the differences between functional and non-functional requirements helps deeply analyze project needs and identify the proper scope of work. Besides, knowing the differences will empower you to support users with a better experience and satisfy the stakeholders with their needs and requirements.

Functional Requirments

When talking about functional requirements, we usually think along the lines of what the system should do.

We expect the functional requirements to deal with the following questions:

  • What are the business flows of the system? For example, login, storing photos, or more.
  • What business services should the system have? For example, logging service, data access service, or more.
  • What does the user interface of the system looks like? For example, look and feel, general guidance, responsiveness, and more.

You can identify those requirements from answering those questions of what the system should do.

Non-Functional Requirements

Non-functional requirements basically describe what is expected environment for the system with emphasis on edge cases.

The non-functional requirements answer roughly this question of what the system should deal with.

The most common non-functional requirements are:

  • Performance
  • Load
  • Data Volume
  • Concurrent Users
  • SLA (Service Level Agreement)

Functional vs Non-Functional Requirements

Functional RequirementsNon-Functional Requirements
Key QuestionWhat should the system do?What should the system deal with?
How should the system perform the tasks?
ResultProduct featuresProduct properties
FocusUser requirementsUser expectation and experiences
PropertyUse casesQuality attributes
RoleSystem functionalitySystem performance
Significance LevelMandatoryOptional
Identification DifficultyQuite evident to defineQuite hard to discover, unobvious

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