Research on TDD

Question

I know there is done some research on TDD at the North Carolina State University. They have published a paper called \'An Initial Investigation of Test Driven Development in Ind

Answer 1

On the Effectiveness of the Test-First Approach to Programming, by Hakan Erdogmus, Maurizio Morisio, and Marco Torchiano.

Despite the name it covers TDD:

Abstract:

Test-Driven Development (TDD) is based on formalizing a piece of functionality as a test, implementing the functionality such that the test passes, and iterating the process.

This paper describes a controlled experiment for evaluating an important aspect of TDD: In TDD, programmers write functional tests before the corresponding implementation code. The experiment was conducted with undergraduate students. While the experiment group applied a test-first strategy, the control group applied a more conventional development technique, writing tests after the implementation. Both groups followed an incremental process, adding new features one at a time and regression testing them.

We found that test-first students on average wrote more tests and, in turn, students who wrote more tests tended to be more productive. We also observed that the minimum quality increased linearly with the number of programmer tests, independent of the development strategy employed.