I've had a lingering question about the "spike solution" phrase. What's the etymology of this?

For a long time, I thought of spike as in "nailing down some details."

Today, I found this: http://agiledictionary.com/209/spike/

I was wrong. I'm happy to see this explanation.

The phrase appears …

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