Context: Developer’s within software companies work chosen choice of software development process. Choice of a particular Software Development Process impacts the work environment, end-product and might also have financial risks due to delay in delivering in the final software product.

Objectives: we are investigating if the TDD could impact/applicable in large-scale industries. To achieve that we first identify the strengths and challenges while using TDD in large-scale industries. Identify what modifications can enhance the impact of TDD in large-Scale industries.

Methods: Systematic Literature Review (SLR) has been used to investigate the application of TDD in large-scale industries. Using the info from SLR we conducted an online survey for validating the results obtained from SLR. As a last step we have conducted semi structured interviews to gather information from developers across industries practicing and practiced TDD. The data from the qualitative and quantitative methods is triangulated by identifying the strengths, challenges and modifications in applying TDD to large-scale industries.

Results: The findings from our SLR, results validated from Survey and responses from interview participants show that TDD have both strengths, Challenges and modifications.

Conclusions: Some challenges encountered when using TDD in large-scale industries are Negative test cases, linking test case modules of several developers, Communication, Overall idea about project, lack of TDD knowledge for developers practicing TDD, also lack of automation tools supporting the development of unit test-cases.