> For the complete documentation index, see [llms.txt](https://www.pranaypourkar.co.in/the-programmers-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.pranaypourkar.co.in/the-programmers-guide/software-testing/testing-fundamentals/software-testing-methodologies/non-functional-testing.md). # Non Functional Testing ## About Non-Functional Testing focuses on the operational aspects of a software application, such as performance, usability, reliability, etc. This type of testing ensures that the software meets certain criteria that aren't related to specific behaviours or functions. ## Types of Non-Functional Testing


Type	Purpose	Key Focus Areas	Example Tools
Performance Testing	Assess how the system performs under various conditions.	Response time, throughput, resource usage.	JMeter, Gatling, k6, LoadRunner.
Scalability Testing	Determine how well the system scales with increased load.	Horizontal/vertical scaling limits, resource bottlenecks.	JMeter, BlazeMeter, Locust.
Usability Testing	Evaluate the system’s ease of use and user experience.	Navigation, accessibility, intuitiveness.	Crazy Egg, UserTesting, Optimal Workshop.
Security Testing	Identify vulnerabilities and assess system protection mechanisms.	Authentication, authorization, data encryption, OWASP risks.	OWASP ZAP, Burp Suite, Nessus.
Compatibility Testing	Verify software works across different environments.	OS versions, browsers, devices, network types.	BrowserStack, Sauce Labs, LambdaTest.
Reliability Testing	Measure the system’s ability to operate without failure over time.	Failure rates, MTBF (Mean Time Between Failures).	Custom monitoring scripts, Nagios, Prometheus.
Recovery Testing	Check how well the system recovers after crashes or failures.	Failover, backup restore, disaster recovery.	Custom test frameworks, Chaos Monkey.
Compliance Testing	Ensure adherence to industry, legal, or organizational standards.	GDPR, HIPAA, PCI-DSS, ISO standards.	Compliance checklists, automated compliance scanners.
Localization Testing	Validate system behavior for specific languages, regions, and cultures.	Date/time formats, translations, currency symbols.	SDL Passolo, Lokalise, Transifex.
Maintainability Testing	Assess ease of maintaining and updating the system.	Code quality, modularity, documentation quality.	SonarQube, CodeClimate, ESLint.

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