Evolutionary software development using Test Driven approach

Test-Driven Development (TDD) is an evolutionary approach in which unit tests are incrementally written prior to code implementation. This paper will discuss about TDD and will compare its development procedure with that of traditional (i.e. test-last) methodology. The TDD approach is radically different from traditional approach; in traditional approach, tests are written once the production code has been completely written down, unlike TDD where tests are written prior to writing the code. Although Test driven development has attracted the attention of professionals, the empirical evidence of its superiority over traditional approach is very limited. In this report we will discuss both approaches and also try to put some light over how does TDD stand along with other SDLC models. In addition, we will look whether TDD has any influence on real world projects; if yes then how?