How lng is a Piece of String
summary
Estimation is hard and repeated practice alone does not reliably improve accuracy; research on the Agile Alliance shows relative estimation using story points has no proven advantage over absolutes. Small, well-scoped items are consistently easier to estimate, while hidden complexity breaks estimates for larger items. Recommended reads are Software Estimation and Waltzing with Bears for risk-focused techniques. Practical fix: adopt sizing buckets or LunaLogic story point cards and split anything that lands in the “too big / no clue” bucket.
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