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A phased-and-gated system creates multiple batches that slows down the overall speed of a product development project. The group of phased activities is a batch that has to be completed in order to produce a set of deliverables, which is another batch for review and decision at a gate.
Reinertsen indicates the problem is that the batch is held up until the longest activity in the batch is done. The bigger the batch, the more likely it is that work will be held up waiting for the batch to complete .
For example, a capital equipment request is held up until the justifications have been collected for every item on the request. If you could split the capital request into two groups, the items that are quickly justified can be approved and acquired while the remaining requests are dealt with.
Dealing with risks and uncertainties in small batches increases speed in several ways:
To better understand how this works, queuing theory tells us that batch size is proportional to queue size. The bigger the batch, the bigger the queue, and the longer batches have to wait for attention (service). Thus, smaller batch sizes have some great benefits for product development:
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 Donald G. Reinertsen, The Principles of Product Development FLOW (Redondo Beach, CA: Celeritas Publishing, 2009), Chapter 5.