Keep as simple as possible
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The backlog division can optionally appear or not on the board, and should have a separated view too.
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Use drag-and-drop to move the tasks between the positions.
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When a tasks is created, all contributors of the project are informed, besides who create.
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When the position of a tasks is modified, all contributors of the project are informed, besides who move.
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The contributor choose at his options if want to receive emails or not
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A simple burn-down chart, Pair chart, Interrupt count chart. Reference
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Interact with Github