Story points were originally a euphamism for ”ideal days”.
Actual timeline estimates multiple ideal days by some “load factor”, or reality multiplier that tries to account for distractions and volatility in effectiveness—3 is a good value to start with. The term “points” is only used because speaking in terms of days but actually meaning 3x as many days is confusing to others.rJ1
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Ron Jeffries, “Story Points Revisited,” May 23, 2019, https://ronjeffries.com/articles/019-01ff/story-points/Index.html. (See notes.)