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Slides from my talk at CEWT #3, http://qahiccupps.blogspot.co.uk/2016/11/testing-all-way-down-and-other.html
The idea that testing is or can be a recursive activity - or even fractal - has some currency. In that view, a test or experiment generates some data, which suggests new experiments, which generate some data, which suggest new experiments and so on. The kinds of activities being done at each stage will be self-similar and testing is used as a kind of microscope to focus in on some aspect of the system under test. Testing all the way down.
In this talk, I'll instead view testing as a number of different instruments that can be used in an arbitrary number of dimensions. Further, I'll suggest that testing can be applied not only to a system, but to descriptions of that system, to models of that system, to abstractions of that system, to a system which is testing that system, and to a system which is testing the system which is testing that system. And so on. It's testing all the way round.
I'll finish by proposing a definition of testing that I think might capture this wide applicability.