I made a mistake. The velocity is calculated in terms of stories, not tasks. I was quite concerned with the accuracy of velocity calculation, because there were always someone forgot to estimate tasks before starting them, and there were some tasks being marked as completed, but costing "no" time. I sent email to the administrative group saying that this will affect our velocity calculation. Later, with the reminder of Philip, I realized that they only affected the assessment of our estimation.
Philip told me about a suggestion from Nate. Nate said that we had to go off the computer to plan before we started coding. We had to think what we wanted to do, and then consider how the computer could help us, instead of writing a program first, and thinking how we could use it.
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