A handover should not require the original team to reconstruct the system from memory. The information needed to operate and change the product should already exist, remain close to the work, and be updated through the delivery process.
Generated API documentation can be useful, but it is not enough. A future team needs to understand why the system is shaped this way, where the boundaries sit, what can fail, how to recover, and who owns each critical responsibility.
The minimum useful handover
- A system map showing services, data stores, integrations, and trust boundaries.
- Architecture decision records explaining important choices and trade-offs.
- Environment, deployment, backup, restore, and rollback procedures.
- Operational runbooks for common incidents and known failure modes.
- Data ownership, retention, access, and migration guidance.
- A current responsibility map for product, engineering, operations, and external providers.
Documentation must have an owner
Documentation decays when updating it is optional. Assign ownership, review critical runbooks after incidents and releases, and include documentation changes in the definition of done when behaviour or operations change.
“Maintainable software leaves the next responsible team with clarity, not archaeology.”
— Renovative Lab principle