In agile methodologies (e.g. SCRUM), the complexity/effort needed for a user stories are measured in Story points, and story. Story points are used to calculate how many user storystories a team can take in an iteration.
What is the advantage of introducing an abstract concept story(story points), where we can just use a concrete measurement, like estimated man-days? We can also calculate velocity, estimate coverage of an iteration, etc. using estimated man-days.
In contrast, story pointpoints are harder to use (because itthe concept is abstract), and also harder to explain to stakeholderstakeholders. What advantage does it offer?