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A study conducted by Microsoft found that "code quality" increased by 200% when TDD was used, compared to similar projects that didn't use TDD.
Bhat, Thirumalesh, and Nachiappan Nagappan. "Evaluating the efficacy of test-driven development: industrial case studies." ISESE '06: Proceedings of the 2006 ACM/IEEE international symposium on Empirical software engineering, 2006, pp. 356-363. DOI: 10.1145/1159733.1159787.
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The results of the case studies indicate that the pre-release defect density of the four products decreased between 40% and 90% relative to similar projects that did not use the TDD practice.
Nagappan, N., Maximilien, E.M., Bhat, T. et al. Realizing quality improvement through test driven development: results and experiences of four industrial teams. Empir Software Eng 13, 289-302 (2008).
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A team at IBM adopted TDD and reported a 50% decrease in the bug defects compared to similar a similar system that was built using an ad-hoc unit testing approach.
E. M. Maximilien and L. Williams, "Assessing test-driven development at IBM," 25th International Conference on Software Engineering, 2003. Proceedings., Portland, OR, USA, 2003, pp. 564-569, doi: 10.1109/ICSE.2003.1201238.
A researcher at NRC's Institute for Information Technology observed that the minimum quality increased linearly with the number of programmer tests, independent of the development strategy employed
H. Erdogmus, M. Morisio and M. Torchiano, "On the effectiveness of the test-first approach to programming," in IEEE Transactions on Software Engineering, vol. 31, no. 3, pp. 226-237, March 2005, doi: 10.1109/TSE.2005.37.
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