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Difference between SIT and UAT

The SIT and UAT are components of the testing process. SIT is responsible for testing module interfaces and connections with various system components such as software, hardware, and system interfaces. In contrast, UAT is a validation testing performed from the user's perspective in which user needs and business-related activities are evaluated to assess whether or not the system can be accepted.

In this article, you will learn about the difference between SIT and UAT. But before discussing the differences, you must know about the SIT and UAT.

What is SIT?

SIT is an abbreviation for "System Integration Testing". It is the type of software testing that is utilized to provide overall testing of a full system made up of numerous interconnected components. It may be conducted on a system with distinct hardware components, different software components, or both hardware and software components.

It is the process of making the constituent integral components of a system in a logical and sensible manner. It conducts testing at a lower cost. It verifies the system's overall functionality. It includes system testing, which is a process of verifying that the system meets the requirements and that the system functions as expected by the user.

SIT is the initial testing procedure carried out after the system has been put together during the development phase. It is also known as a testing procedure that examines a software system's ability to coexist with other systems. It contains various integrated systems, all expected to have already passed SIT, and it is used to test the interactions among various integrated components.

Objectives of SIT

There are various objectives of SIT. Some main objectives of SIT are as follows:

  1. It is utilized to fulfil the user and software requirements.
  2. It is used to verify the system control flow.
  3. It is used to maximize memory usage.
  4. It is used to minimize the time consumption for the testing process.
  5. It is used to check the bugs and errors in the system.

System Integration approaches

System integration testing may be of two types which are as follows:

1. Components or sub-system integration

The component integration testing process begins with the two available components and proceeds until all element interfaces are tested.

2. Final integration testing

SIT is the final stage of integration, where all parts are merged.

Types of SIT

System Integration Testing is divided into two approaches: top-down integration approach and bottom-up integration approach.

1. Top-down integration approach

In this approach, the modules are combined by moving downwards in the hierarchy, where the main module of the system is at the top. If lower modules are not available, the dummy modules called stubs are utilized for testing in a top-down method. During the test, a stub serves as the module. Stubs provide the minimum functionality needed to be utilized while testing the 'above' module.

2. Bottom-up integration approach

In this approach, the modules are merged and begin to test at a very low level. If the top-level modules are unavailable, drivers are utilized for testing, and a driver is a program specifically developed for testing.

What is UAT?

UAT is an abbreviation for "User Acceptance Testing". It is carried out at the end of the entire testing procedure when the product or process is ready to deliver. The primary objective of software development is to create software that is capable of satisfying user demands rather than simply meeting system specifications.

UAT is formal testing performed to determine whether a software system meets its acceptance criteria and to allow the buyer to determine whether or not the system may be accepted. One of the key benefits of this testing method is that it creates confidence in end users that the software being delivered meets their needs.

Types of UAT

Acceptance testing is classified into three types: alpha, beta, and gamma.

1. Alpha testing

The customer conducts it on the development site and in the development environment.

2. Beta testing

The primary user carries it out at the user site and in the user environment.

3. Gamma Testing

The organization that built the product is responsible for carrying out gamma testing.

Acceptance Criteria of UAT

The acceptance criteria are described as requirements that must be met by a system for the end user to accept it. The three requirements for acceptance criteria for UAT are as follows:

1. Product Acceptance

It states that the acceptance criteria must be modified and established as needed as the product prerequisite changes.

2. Procedure Acceptance

The acceptance criteria may be specified based on the delivery procedure.

3. Service Level Agreements

SLAs are just a part of the contract signed by the user and the product organization that aids in the verification of software as part of acceptance testing.

Key Differences between SIT and UAT

Difference between SIT and UAT

There are various key differences between SIT and UAT. Some of the key differences between SIT and UAT are as follows:

  1. SIT (System Integration Testing) is utilized to test the overall functionality of a system after all of its components have been integrated. In contrast, UAT (User Acceptance Testing) is responsible for the system's testing from the user's point of view.
  2. The SIT flaws would be related to control, data flow, etc. In contrast, difficulties in UAT would be caused by functionality that does not meet the needs of the user.
  3. SIT testing necessitates the use of expert developers and testers. In contrast, UAT is done by the product user or organization that purchases the software.
  4. SIT is operated as soon as the system is created. In contrast, UAT is done at the end and right before the product is released.

Head-to-head comparison between SIT and UAT

Here, you will learn the head-to-head comparisons between SIT and UAT. The main differences between SIT and UAT are as follows:

Features SIT UAT
Full Forms SIT is an abbreviation for System Integration Testing. NUMA is an abbreviation for User Acceptance Testing.
Basic It is utilized to test a system's overall functionality after all its components have been integrated. It is responsible for the system's testing from the user's point of view.
General Problems Its flaws would be related to control, data flow, etc. UAT difficulties would be caused by functionality that does not meet the needs of the user.
Performed by It is performed by testers and developers. It is performed by the end-user and customer.
Testing order It is done after unit testing but just before the system testing. It is done at the end after the system testing.
Types It is mainly of two types: The top-down Integration Approach and Bottom-up Integration Approach. It is also mainly of two types: Alpha testing and Gama testing.
Testing for Functionality It is operated according to the requirements of the testers. It is operated according to the user's perspective on how the product should be utilized.


SIT is performed primarily to validate a system's interface requirements. On the other hand, UAT is performed by an end-user to validate the overall functionality of the system. Appropriate test cases must be written for both tests. SIT can be accomplished using one of three methods (Top-down, Bottom-up, and Big bang approaches). There are five methods for performing UAT (Alpha and Regulation Acceptance testing, Beta testing, Operational Acceptance testing, Contract Acceptance testing, and Black box testing).

Errors discovered during system testing are simple to fix, and different builds may be created based on the defects. In contrast, flaws discovered during UAT are considered a black mark to the testers and are not accepted. UAT requires that the clients or business executives are satisfied that the generated product satisfies their requirements in the business environment. SIT should fulfil the system's functional needs.

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