The Five Fingers scale is a great way to estimate using the tools mother nature gave us! Each finger is a different response or number.
Top 7 Agile Estimation Techniques with Use Cases
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Why Your Agile Team Should Use Relative Story Point Estimation - Celerity
Estimating Based on Hours vs Effort
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Fibonacci Scale for Agile Estimation
Agile Estimation and Agile Estimation Methods, by David Theil
Don't Equate Story Points to Hours
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The Five Fingers: Fantastic Fables: 9781467882835: Mo, Mo: Libros, five fingers