サイロ・ブレイカー（孤立打破）

1. Specialization vs. Flow Efficiency (Local vs. Global Optima): Functional silos (Design, Dev, QA) rely on highly specialized experts who execute isolated steps quickly. However, silos optimize for "Resource Efficiency" (keeping everyone 100% busy), creating massive queue times and handoff delays between departments.

2. T-Shaped Teams, End-to-End Responsibility & Resilience: Cross-functional squads possess all skills needed to deliver value end-to-end. While generalists may take slightly longer on a single step than pure specialists, eliminating handoff gates reduces total lead time exponentially. Furthermore, T-shaped profiles boost resilience: if a team member is unexpectedly absent, others can step in because critical knowledge is shared rather than siloed.

3. Hidden Costs of Handoffs (Knowledge Loss & Friction): Every time work crosses a departmental boundary, context is lost. Developers re-interpret tickets and testers question assumptions. In a squad, all roles collaborate in real time on the same channel, resolving ambiguity instantly.

4. Conway's Law & Team Topologies: Conway's Law states: "Organizations design systems that mirror their communication structures." Siloed structures produce monolithic, sluggish handoff processes. Modern agile organizations align cross-functional teams directly around value streams (Value Stream-Aligned Teams).