Below is an excerpt from my book “Pomodoro Technique Illustrated”, which is currently available as a free public draft at: www.pomodoro-book.com
One Pomodoro is a 25 minute iteration. Multiple Pomodori are surrounded by a larger daily iteration. The latter starts with planning and ends with the retrospective. In a Pomodoro I only allow myself to focus on one activity, but how many activities should I plan for one day?
In “Extreme Programming Explained”, Kent Beck told a story about how a national weather service spent a gigantic amount of money on a new forecast system. All the emerging technology was included and it had an accuracy rate of almost 70%. Then a clever person [probably a little girl - my comment] challenged the super machine with a much simpler algorithm. It was called Yesterday’s Weather: Tomorrow will be like today. Guess what? It had the same accuracy as the super machine.
Estimating future achievements is guessing. So why not use the history and assume it will repeat itself? If I can quantify my achievements every day, then this is presumably my velocity tomorrow as well. By measuring the number of Pomodori every day, I can even fine tune my velocity continuously with an average.
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Yesterday's Weather
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