I also chose programming language design as an example because I think it’s far closer to art than people realize. Typography specifically is a great analog: nobody can deny it’s all about psychology and yet most people involved in typography don’t have formal psychology backgrounds or use psychology research methods. The same for computer science.
There are only two fields that really rely on “formal” psychology: human-computer interaction (HCI) and software engineering. Both of these fields consistently rely on psychology research and use research methods developed by psychologists. (The user studies and experiments run by HCI researchers are going to look familiar to psychologists!)
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