Iterative development and tests: how to aim at moving targets.

Test driven development can be seen as a mirror image of model driven development, a somewhat logical consequence considering the limited role of models in agile approaches.
The downside is that without fully defined objectives, there is a question mark on the kind of reference against which programs are to be tested; likewise, the question is how results are to be managed across iteration cycles, especially if changing requirements are to be taken into account.
Remy.
http://caminao.wordpress.com/2013/04/24/tdd/



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