Manufacturing product genealogy

Genealogy explains how outputs relate to inputs

Manufacturing genealogy links materials and components to the outputs created from them. The relationship may be simple, such as one input lot used for one production batch, or complex, such as several materials merged across several runs.

Genealogy differs from a list of purchase orders or a standard bill of materials. A bill of materials describes intended composition. An actual genealogy should identify the inputs used for the particular output under investigation.

Capture the transformation boundary

Define when material consumption and output creation are recorded. Link the relevant production run, facility, input identity and output identity. Quantities and units help test whether the relationship is plausible.

When capture is retrospective, state the limits. A shift-level allocation may be less precise than a direct run-level record. Do not imply item-level certainty when the data only supports a broad production window.

Handle splits, merges and rework

A lot may be split across several runs. Several lots may be blended into one output. Rework may bring earlier output back into a later run. Preserve these relationships explicitly rather than forcing them into a simple linear route.

Rework needs its previous identity and its new use recorded. Otherwise an affected lot may have downstream relationships that are invisible in the original run history.

Reconcile records with physical activity

Compare the captured relationships with production logs, quantities and operator practice. Investigate unexplained output, unallocated input and unexpected leftovers. A technically valid graph can still omit the material actually used.

Keep planned and actual data clearly distinguished. The system should not silently substitute the scheduled input when an operator uses a different lot. Define how substitutions and corrections are authorised.

Test the graph in both directions

Starting from an output, identify contributing inputs. Starting from an input, identify outputs and their destinations. The two queries should use the same recorded relationships. Test known split and merge examples before relying on the system for an incident.

The traceability lab demonstrates a simplified two-input genealogy. Use recall traceback planning to add scope decisions, uncertainty and supporting evidence around the graph.

Frequently asked questions

Can a bill of materials replace actual genealogy?

A planned bill of materials does not necessarily identify the lots actually used in a specific run. Preserve actual consumption and substitution records when those relationships are needed for investigation.

Why does rework matter?

Earlier output can become a later input. If that link is missing, downstream affected material may be excluded from a trace. Record the previous identity, the rework activity and the later output relationship.