EXPERT RESPONSE
I do not believe you need to have designed or built a product in order to test or critique a product.
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I do not believe software engineers or system architects design better tests. I believe skilled software testers design better tests.
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Consider the number of everyday appliances and devices you might use, from coffee pots to personal navigation systems, that you have challenged or tested without having experience designing or building them.
I do not believe software engineers or system architects design better tests. I believe skilled software testers design better tests. I believe that for those activities we engage in frequently, we become more skilled at and in turn, we may make the skill look easier and easier as our level of competency increases.
Point of view, focus, motivation and practice -- these are four advantages testers have over developers in becoming better testers. Developers may have different insights and ideas about what to test and those ideas may originate from their knowledge of the inner workings of the code, but different doesn't necessarily mean better (bug finds).
If you feel uncomfortable about your own level of knowledge, especially on technical matters, I would suggest continued learning to help improve your confidence.
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