![]() The values in the Fibonacci sequence work well because they roughly correspond to Weber’s Law. (I know I can’t.) And if you could, it would mean you should be able to distinguish between a 1.00 kg weight and a 1.05 kg weight, as that would also be 5%. The difference between 20 and 21kg, however, is only 5%. You can probably distinguish the weight of items that differ by 100%. The difference from one to two kilograms is 100%. ![]() Weber’s Law states that the difference we can identify between objects is given by a percentage. But you would have a much harder time identifying the heavier of the two weights. They are the same one kg difference as the one and two kg weights. Imagine instead being handed a 20kg weight and a 21kg weight. The two kg weight will feel noticeably heavier. With one in each hand but not able to see which is which, you can probably distinguish them. Imagine being handed two weights-one is one kilogram (2.2 pounds) and the other is two kilograms (4.4 pounds). It’s because numbers that are too close to one another are impossible to distinguish as estimates. Years ago I began having teams estimate with a modified Fibonacci sequence of 1, 2, 3, 5, 8, 13, 20, 40 and 100. The traditional Fibonacci sequence is 1, 2, 3, 5, 8, 13, 21 and so on, with each number the sum of the preceding numbers. If you’ve estimated with Planning Poker, you may very well have used cards with either the Fibonacci sequence, or a modified Fibonacci sequence.
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