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Agile software teams solve the problems with waterfall by building their software incrementally, making only the decisions around the specific work packages they’ve chosen to complete in a sprint. They delay even the decisions about which work packages or user stories to implement, choosing them out of a backlog at the start of each sprint. They get immediate feedback, first from their own tests and then from the users at a Demo to validate their decisions.
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Katherine Radeka (When Agile Gets Physical: How to Use Agile Principles to Accelerate Hardware Development)