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System Integration Testing (SIT) is a vital part of any good test strategy. A pre-SIT round is generally established by the software provider before clients run their own SIT test cases.

When developing, implementing, or integrating new applications, websites, or mobile apps, you want to do so with confidence they’ll work as designed.

With so many variables of operating systems, browsers, hardware, software, architecture, customisations, and devices, not to mention keeping track of APIs and data feeds, there are many ways to get caught out.

As specialists, we know the importance of quickly providing assurances that your software, responsive websites, mobile apps and more, function correctly across all target platforms, including the most popular mobile devices, browsers, and operating systems.

Why invest in System Integration Testing?

A good SIT strategy helps to:

  • Detect defects early
  • Schedule defect fixes
  • Correct data flow
  • Correct control flow
  • Correct timing
  • Correct memory usage
  • Correct with respect to software requirements


Our approach is methodical and risk-based, identifying all interfaces and the associated data needed to prove all possible transfers and transformations. The planning process identifies tests that will exercise true end-to-end processes, which are then prepared in detail, against the matching data.

We have experience of System Integration Testing in a range of sectors and technical landscapes.

We work collaboratively with you, becoming an extension of project teams and are aided by industry leading, cloud-based technologies. We follow a structured method for planning and development of tests. Carefully selected test cases are executed across a matrix of platforms, providing an independent view and a deep insight into the readiness of your applications to go live.

The integration of major Commercial Off the Shelf Systems (COTS) is complicated, not only in delivery, but also in testing. It is vital to ensure all interfaces function correctly before systems are implemented, especially where bespoke elements and/or customisations have been introduced. Configuring applications to communicate with each other, as well as with third-party partners needs to be thoroughly tested.

SIT can be conducted as:

  • Intra-System Testing: low level of integration testing, aims at fusing modules together and build a unified system.
  • Inter-System Testing: high-level testing, needs interfacing independently tested systems.
  • Pairwise Testing: two inter-connected sub-systems are tested at a time.

Mobile Devices

We understand that virtual or cloud-based mobile devices are not suitable for every project and we keep an extensive and regularly refreshed array of physical devices for use on projects, including devices by all major manufacturers.

Our consultants execute an agreed set of tests on devices side-by-side, noting timings and any rendering issues on websites and performing scripted functional tests, supplemented by exploratory techniques on applications and websites.

Automated tools are used wherever practical, especially when tests are to be repeated. Depending on the browsers and operating system, it is usually possible to automate a set of tests and run them on different configurations relatively easily.

Test Labs: UK and Offshore

Our UK Test Lab is based at our offices in Hertfordshire, where we run remote manual and automated tests on an in-house stock of hardware, operating systems and browsers.

Our Consultants often work in a hybrid approach where they also spend time on customer sites.

We are backed by state-of-the art offshore facilities in India, with a large team of seasoned testing specialists that can provide cost effective Functional Testing, Automation and Performance Testing services.

Your security

Our labs establish secure connections via VPN to test environments on your technology estates. All our Consultants are thoroughly vetted and sign confidentiality and non-disclosure agreements to ensure information security is maximised.

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