It’s universally and self-applicable. Whenever I’m making a plan, or figuring something out, be it engineering or code or physics or whatever, I rubber duck -

It’s universally and self-applicable. Whenever I’m making a plan, or figuring something out, be it engineering or code or physics or whatever, I rubber duck - that is, I explain what I’m doing and why, verbally, in exhaustive detail, to nothing and nobody in particular (for I do not have a rubber duck), and ask questions of myself that a rubber duck would ask. I often catch a snag where I would otherwise have thought my scheme flawless.