[alexraj]

The estimation is done by the team, and when the numbers are sufficiently apart, team can divide predictably. Let's say you have a six member team, when estimates happen 4 can say 5, and 2 can say 8. Discussion happen, and we finalize one between 5 or 8.

Consider same for a linear estimate. 2 will say 4 days, 1 will say 5 days, 2 will say 6 day, and 1 will say 8 days. How do you come to a conclusion now, it surely needs more debate, to determine if it is 4 or 5 or 6 or 7 or 8.

If you do not like Fibonacci you can use powers of 2. Like 1, 2, 4, 8, 16, or you can form your own sequence with numbers sufficiently apart. Since Fibonacci standardized it we just use it. -Alexander Jayaraj