U-curve

…a heap of work, like a Template:Pal or story map.

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Determine the optimum sprint length or batch size.

A sprint effectively is a small batch of work that you pull in and get done. Smaller batches make you more nimble and flexible, and reduce risk, yet come at the cost of splitting (‘transaction costs’). So, use the story splitter with care—ka-ching a day makes product owner hurray.

Therefore:

Find the sweet spot for best batch sizes by balancing the holding cost with the economy of scale.

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Sources

• Flow—Principles of Product Development by Donald Reinertsen
• The Lean Agile PMO » Rich Eaton » How Small is Small? Selecting the Optimum Batch Size.