size range , and helping to set and manage daily expectations . Frankly I've found that task-estimation to be very useful in the early stages of learning agile development. But, it is just as true that over time, as improved skill and intuition help us stay within a reasonable range for task size, the practice becomes less important. But [agile] development is not about following one formula. It's about finding what works for you right now, and adapting to change - including changes in your own personal development.
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