A lineage review that checks whether each list entry has a dated source, a collection method, and an accountable owner.
Research question and scope
This protocol examines lead source lineage. It reports what a defined record can show in one window and does not claim an industry rate or a causal effect.
Population and unit of analysis
The unit is one list entry at first import. Keeping one unit prevents linked events from being counted as independent successes or failures.
Definitions and measures
The main measure is the share with a complete source chain. Report the denominator and time window beside every count so the result is not read as a bare percentage.
Evidence and data dictionary
Collect the source URL, collection date, and importer. Label missing, unavailable, and confirmed negative as separate states rather than collapsing them into a blank.
Sampling and collection
The sample is a fixed sample from each active list source. Record the observation date and exclude items that were already open before the window begins.
Analysis and reporting
Present completeness by source and list owner. Separate seller behavior from tool behavior whenever the evidence allows that distinction.
Limitations and sources of error
Limits include lists rebuilt from screenshots or forwarded files. State them beside the finding and avoid turning a small operational sample into a universal standard.
Review cadence and next action
The practical next step is to reject one list source that cannot show lineage. Re-test a later sample after the change so the review produces a decision, not just a report.