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TIL that agile has its own words for everything.
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That was a thing in the early 2000's. You had to have a blog and invent words that describe regular things everyone did.
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Why can't they call it a prototype or experiment? Sheesh.
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Prototype is usually something working, while spike can be pure research (e.g. validate that APIs are feasible and enough, or that something satisfies requirements). Prototype is usually more polished/usable. Experiment in my mind is something which user-facing but not in stable yet.

So for me they are differentiated enough, but could be that I am just used to it.

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An experiment doesn’t say anything about user facing or not. I do tons of them when reverse engineering poorly documented hardware and APIs to determine if the thing I’m trying to do is even supported.
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