Average length of user stories

Within a couple of years, a template for writing user stories had emerged from the community in London.

As a , I want a , in order to

The use of this template greatly standardised the writing of user stories. One of the creators of this approach, Tim McKinnon, reported to me in 2008 that he now had data to show that the average user story was 1.2 days of effort and the spread of variation was a half-day to about four days.

Kanban - David J. Anderson http://www.amazon.co.uk/gp/aw/d/0984521402/ref=mp_s_a_1?qid=1317465409&sr=8-1
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