We need to look for natural ways to break down the system (fracture planes) that allow the resulting parts to evolve as independently as possible. Consequently, teams assigned to those parts will experience more autonomy and ownership over them. Looking to align subsystem boundaries with (mostly independent) segments of the business is a great approach, and the domain-driven design methodology supports that approach nicely. But we need to beware and sense for other fracture planes, such as change cadence, risk, regulatory compliance, and so on. Often, a combination of fracture planes will be
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