Why estimate the project in Story points, a note to clients

No project can go very long before someone starts asking “When will you be
done?” The best approach for estimating stories would be one that:

• allows us to change our mind whenever we have new information about a
story
• works for both epics and smaller stories
• doesn’t take a lot of time
• provides useful information about our progress and the work remaining
• is tolerant of imprecision in the estimates
• can be used to plan releases

An approach that satisfies each of these goals is to estimate in story points. A
nice feature of story points is that each team defines them as they see fit.

Source- Mike Cohn's book

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