Estimation units - alexanderteplov/computer-science GitHub Wiki
Can usually take values based on the rounded the Fibonacci sequence% 1, 2, 3, 5, 8, 13, 20, 40, 100.
There are several reasons Fibonacci numbers are used, and used in this format. First is the notion that once teams eliminate time as the estimate base, they are less likely to demand more detail and pad estimates. These numbers instead represent relative size, not time. As a result, the estimation exercise goes quite quickly. Teams generally spend roughly two minutes on each item, allowing a backlog of 30 items to be estimated in an hour. The fact that teams are limited to only 9 choices (i.e., point values or cards) also helps speed up the process.
The sequence also provides the right level of detail for smaller and better-understood features, while avoiding a false sense of accuracy for higher estimates.
It's an agile metric for measuring relative team speed (dedicated for this team exclusively).
It is important to note that points do not have the same meaning across teams; for example, one team's “five” does not equal another team's “five.” Thus team velocity, which is derived from points, should not be used to compare productivity across teams.
Burndown charts graphically illustrate how fast your team is working by plotting user stories against time. It works from the end user’s perspective, so the chart is only updated after the successful completion of a user story. The burndown chart is also used to record a team’s pace, called velocity, and predict their performance.
The use of T-shirt sizes (Extra Small [XS], Small [S], Medium [M], Large [L], Extra Large [XL]) is another way to think of relative sizes of features. This is an even greater departure from the numeric system, and like all good gross-level estimation units can in no way be associated with a specific length of time.
Other arbitrary tokens of measurement include Gummi Bears, NUTS (Nebulous Units of Time), and foot-pounds. Teams may create their own estimation units, and as you can see, they often have a bit of fun in doing so.