One coordinated material plan, from released files to assembled boards. Full turnkey assigns procurement of the bare PCBs and the approved component list to the assembly supplier. Your team still owns the design and approves engineering changes.

Define the purchasing boundary

The quotation should identify the board revision, BOM revision, quantity, approved sources and any parts excluded from the order. List manufacturer part numbers rather than distributor descriptions alone. Specify whether freight, programming, fixtures and functional testing are included. A single purchasing contact does not automatically mean every downstream activity is in the price.

Resolve material decisions before release

Ask for the status of long-lead items and for approval requests when the exact specified part is unavailable. An alternative with a similar description may differ in package, pinout, tolerance, firmware behavior or qualification. Record substitutions in an approved BOM revision. Agree who owns minimum-order excess and what happens to unused material.

Manage changes after the order

Once procurement or fabrication begins, a revised design can create obsolete boards and components. Use one release identifier and a change log. Ask which work can still be stopped, what can be reused and what must be requoted before approving the change. For repeat builds, verify pricing and availability again; a previous order is a reference, not a current inventory commitment.