When I was in high school I took several science classes that included performing experiments. It's a basic premise of science that under the same conditions, your experiments should show the same results. For example, if you fill a test tube with oxygen, then insert a lit match into the test tube, the flame should become brighter. If you perform the experiment and the flame goes out, it's assumed that you, the scientist, did something wrong.
I believe that magick is (or should be considered) an experimental science. Curiously, most people look at a magickian, and if his or her magick didn't work, rather than assume that the magickian/scientist did something wrong, they automatically