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Difference between System Integration Testing (SIT) and User Acceptance Testing (UAT)

Last Updated : 26 Jun, 2024
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System Integration Testing (SIT) and User Acceptance Testing (UAT) have different purposes in the software testing process. System Integration Testing (SIT) ensures that different modules or systems work together correctly, focusing on the interactions between them. User Acceptance Testing (UAT) checks if the software meets user needs and business requirements, ensuring it is ready for real-world use. SIT is performed by developers and testers to identify integration issues, while UAT is conducted by end users to validate the system's overall functionality.

What is System Integration Testing (SIT)?

For a better understanding of what is SIT first, we must understand what is System integration. so basically as the name itself suggests system integration refers to a set of phases where various components are incorporated into a single unit, and these units go for integration testing, the group of interaction between components is referred to as integration and testing these interactions and modules interaction is known as integration testing. 

From another point of view, the SIT (system integration testing) is considered the combination of integration testing and system testing. At this point, we know what integration testing is. Now, we need to understand what system testing is. The testing performed on the absolute integrated products to check system compliance with specified requirements on functional and non-functional elements is referred to as system testing. 

SIT is also considered a combination of integration testing and system testing. 

What is User Acceptance Testing (UAT)?

UAT (User Acceptance Testing) is conducted at the end of the whole testing process when the product is ready to deliver. The main aim of software development is to develop software that is capable of satisfying user needs, rather than just fulfilling the system specifications. UAT is conducted when the product is ready to deliver it is also called as at the end of the whole testing process. UAT is used to validate whether the system is acceptable or not. 

UAT validates that:

  • The developed system fulfills the system requirement specifications
  • The system has achieved the performance as documented in the system requirement statement.
  • It could vary as defined in the contract.

Difference between System Integration Testing (SIT) and User Acceptance Testing (UAT)

Comparison ParameterSITUAT
Basic of TestingSIT refers to the interfacing between the modules.UAT focuses on the requirements from the user's point of view.
Performed BySIT is performed by Developers and testerUAT is performed by Customers and end users
Testing orderAfter unit testing but before system testingAt the end after system testing
General issuesProblems like data flow, control flow, etc.Functionality issues or non-working features according to the user requirement.
Working Steps
  1. Integration of individual units
  2. Testing of the whole system
  3. Appropriate software is used for writing test cases that is in accordance with software requirements.
  4. This testing identifies errors such as UI errors, data flow errors, and interface errors.
  1. Create a UAT plan on the basis of requirements
  2.  The gathered requirements are used to form scenarios.
  3. Prepare test cases and test data
  4. Execution of test cases for error checking
  5. Project sent to production if no errors found
  6. Any flaws or bugs must be fixed right away in order to get the product ready for release.
Types
  1. Top-down Integration Approach
  2. Bottom-up Integration Approach
  1. Alpha Testing
  2. Beta Testing
Testing for FunctionalityFor the system to function by the specifications, integration of the individual units done and then tested. In UAT, the entire system is examined for compliance with the intended user's primary functionality.
Purpose Verify the interactions between software systems or modules Verify if the software meets the business and user requirements
 
Focus Testing interfaces between various systems or modules Testing if the software meets user needs and business objectives
 
Test Environment Simulated and controlled environment Real-world environment
 
Test Scenarios Emphasis on testing the integration of various systems Emphasis on testing the software's usability and user experience
 
Test Data Uses test data to simulate module interactions Uses real-world scenarios and user data
 
Test Duration Conducted over a longer duration Conducted over a shorter duration
 
Outcome Identifies defects and bugs in the system's interfaces Identifies if the software meets user needs and business goals
 
Testing Techniques Black-box and White-box testing Black-box testing
 
Test Execution Approach Incremental approach, testing one module at a time Comprehensive approach, covering all user scenarios
 
Tools and Technologies Test management tools, defect tracking tools Test management tools, defect tracking tools
 
Risk and Impact Focuses on risks associated with module interactions Focuses on risks associated with user needs and business goals
 

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