Are story points an excuse for teams not being able to estimate correctly in days/hours?
It is not an excuse but a reality that it is a waste to attempt arriving at an accurate number in days or hours for a User Story. The amount of effort and time required to arrive at such a number trades off against the benefits of estimating in days/hours.
Moreover estimating in days/hours often puts pressure on the team to deliver within the stipulated number of days and the team ends up burning themselves to meet such false commitments. This results in the team never reaching a sustainable pace over a period of time.
(excerpt from http://blog.anandvishwanath.in/, currently only available thanks to Google’s cache)
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