# You asked: Why is the modified Fibonacci sequence used when estimating in safe agile?

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The size (effort) of each story is estimated relative to the smallest story, which is assigned a size of ‘one. ‘ A modified Fibonacci sequence (1, 2, 3, 5, 8, 13, 20, 40, 100) is applied that reflects the inherent uncertainty in estimating, especially large numbers (e.g., 20, 40, 100) [2].

## Why is the modified Fibonacci sequence used when estimating it reflects the uncertainty in estimating larger items?

The reason for using the Fibonacci sequence is to reflect the uncertainty in estimating larger items. A high estimate usually means that the story is not well understood in detail or should be broken down into multiple smaller stories. Smaller stories can be estimated in greater detail.

## What should be taken into account when estimating story points?

A story point estimate must include everything involved in getting a product backlog item all the way to done. If a team’s definition of done includes creating automated tests to validate the story (and that would be a good idea), the effort to create those tests should be included in the story point estimate.

## What is an example of a modified Fibonacci sequence Safe?

The size (effort) of each story is estimated relative to the smallest story, which is assigned a size of ‘one. ‘ A modified Fibonacci sequence (1, 2, 3, 5, 8, 13, 20, 40, 100) is applied that reflects the inherent uncertainty in estimating, especially large numbers (e.g., 20, 40, 100) [2].

## How do you calculate Fibonacci?

Each member estimates a number on the Fibonacci scale that he/she believes represents the size of the task. All members disclose their number at the same time (to avoid being influenced by each other’s estimates). Any differences in the numbers will be followed by a discussion until a consensus is reached.

## How many hours is a story point?

Story Points represent the effort required to put a PBI (Product Backlog Item) live. Each Story Point represents a normal distribution of time. For example,1 Story Point could represent a range of 4–12 hours, 2 Story Points 10–20 hours, and so on.

## Why use story points vs hours?

Story Points are intended to make team estimating easier. Instead of looking at a product backlog item and estimating it in hours, teams consider only how much effort a product backlog item will require, relative to other product backlog items.

## Who writes user stories in safe?

Anyone can write user stories. It’s the product owner’s responsibility to make sure a product backlog of agile user stories exists, but that doesn’t mean that the product owner is the one who writes them. Over the course of a good agile project, you should expect to have user story examples written by each team member.

## What are two types of enabler stories?

Broadly, there are four main types of enabler stories:

• Exploration – often referred to as a ‘spike’. …
• Architecture – design a suitable architecture that describes the components in a system and how they relate to each other.
• Infrastructure – perform some work on the solution infrastructure.
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