When dependencies kept surfacing at integration instead of at planning
A scaled programme kept hitting the same wall at the end of every increment. The teams planned in good faith and committed to their own backlogs. They then collided once the separate pieces met at integration. A signal that one team had assumed was stable would turn out to have changed. An interface that two teams believed they shared meant something different on each side. The retrospectives kept calling this a communication problem and prescribed yet more meetings, yet those extra meetings made very little difference. The deeper cause sat inside the planning process itself. Nothing in that process forced the boundaries between teams to be written down and agreed before the work began.
I borrowed a discipline from an area where it already worked reliably. In AUTOSAR development, software components agree on an interface contract first and then build against it, a habit that keeps their interactions predictable. I took the same idea one level higher and applied it to whole teams. Each team treated the slice of work it owned as an exported interface. They named what other teams depended on and versioned those things. They also stated clearly which parts were guaranteed and which parts were still in flux. Dependency mapping then moved from a side conversation into the centre of planning. The contract between teams became the unit that crossed every team boundary.
The hardest conversations moved earlier in the cycle, which is exactly where an engineering programme wants them. Disagreements that used to surface during integration now happened during planning. The right people were still together and had time to resolve them. Integration stopped being the place where teams discovered expensive surprises. The framework stayed the same throughout, and the improvement came from turning the contract between teams into a visible artefact with a clear owner. None of this required a new tool or a reorganisation. That tends to be the most reassuring part for the people paying for the advice.