Set a Clear Work-in-Progress Cutoff for an Engineering Change

Issuing a new drawing does not automatically change boards that have already been fabricated or assemblies already on a line. An engineering-change release needs a decision about work in progress. Without that decision, purchasing, fabrication and assembly may apply different revisions to the same order.

Take a dated production-state snapshot

Ask for quantities by relevant state: material ordered, bare boards in fabrication, bare boards received, assembly in progress, finished units and shipped units. Identify the order or lot references behind each quantity. The snapshot is useful only if its date and scope are clear.

Include outsourced operations and stock held elsewhere when they are affected. A spreadsheet showing only finished goods can miss the material that will reach the next operation tomorrow. Record uncertainty explicitly when a subcontractor has not yet confirmed its position.

Assign a disposition to each state

For each affected quantity, specify whether it continues unchanged, is held for review, requires a defined modification or cannot be used for the intended release. Tie the decision to the actual design change. A silkscreen correction and a changed connector pinout may need very different treatment.

Do not use the phrase “use the latest revision” as the cutoff instruction. Name the old and new revisions, the affected order or lot, and the point at which the new data takes effect. Clarify whether any approved mixed configuration is allowed and how it will be identified.

Coordinate files, material and instructions

List the released documents and outputs that change together: BOM, fabrication data, drawings, placement files, firmware configuration, test limits or work instructions as applicable. Identify the owner of each replacement. A changed drawing with an unchanged assembly job can leave the intended correction unapplied.

Ask each affected operation to acknowledge the specific revision and disposition it will use. Keep those acknowledgments with the release. This is more reliable than assuming that attaching a new ZIP file to a general email updates every active production station.

Verify the first affected output

Select evidence that confirms the change reached the intended units. That may include a visible feature, a material identity, a configuration record or a targeted test result. Check the transition boundary as well as a later sample; the boundary is where an old job or label is most likely to remain in use.

Close the change record by reconciling quantities under each disposition and recording unresolved holds. Keep the prior revision accessible as history while making the active instruction unambiguous. Use the manufacturing revision-control guide to organize the underlying release package.