Popunder Ad Network for Advertisers
Evaluate popunder ad network for advertisers through source transparency, controlled testing, complete measurement and accepted downstream value.
What this page helps an advertiser decide
Finish with a dated decision memo for new-window or background-tab traffic. State the tested scope, evidence window, excluded variables, source distribution, accepted result and rollback trigger. Explain how trigger quality affected the conclusion and what new evidence would overturn it. This keeps the outcome useful after inventory, policy, pricing or campaign conditions change.
Search intent and cannibalization boundary
This canonical owns one distinct advertiser decision while broader strategy remains on established pillar URLs.
| Layer | Owner | Boundary |
|---|---|---|
| Primary page intent | Popunder Ad Network For Advertisers | Owns the specific commercial decision for popunder ad network for advertisers. Broad traffic purchase intent remains on /buy-website-traffic/ and parent strategy remains on /popunder-ad-network/. |
| Parent intent | Popunder Ad Network | Definitions, broad category strategy and adjacent choices remain on the parent page. |
| Success definition | an attributed popunder outcome that passes eligibility, deduplication and downstream acceptance rules | Visits and clicks remain diagnostic until downstream acceptance is confirmed. |
A visual system for evidence-led campaign decisions
Connect eligibility, source, journey, measurement and rollback before the campaign buys scale.
Source governance matters because new-window or background-tab traffic can change as budgets, bids and inventory conditions move. Classify sources as new, uncertain, promising, reduced or excluded. Apply one promotion rule and one exclusion rule across the test. Recheck destination load integrity after every material scale step, because a winning average may weaken when the source portfolio expands.
Before spending on popunder ad network for advertisers, write the exact audience, country, device, format, destination and policy boundary. This prevents the campaign from drifting toward easier but less valuable delivery. During device or GEO split, compare like with like and preserve the original control. Any necessary exception should be visible in the final report with its reason and likely effect.
Build the decision from requirements to accepted value
Use the detailed checks below to keep the campaign measurable, comparable and reversible.
Define the exact popunder ad network for advertisers decision
A practical review of popunder ad network for advertisers must account for opaque sources, mismatched popunder context, weak journey continuity, duplicate activity, premature scaling and changing success rules. Document each material difference instead of hiding it inside a blended average. If settings, eligibility or source mix cannot be matched, record that limitation in the decision memo. A narrow result that can be reproduced is more valuable than a broad claim that cannot survive a second test.
Operational fit belongs in the economics of popunder ad network for advertisers. Count setup effort, moderation, reporting exports, tracking work, source review and troubleshooting alongside media cost. Evaluate destination load integrity with the same seriousness as delivery volume. A channel that appears cheaper may be less efficient when the team cannot identify sources or reconcile outcomes without manual repair.
Match campaign conditions before comparing sources
Operational fit belongs in the economics of popunder ad network for advertisers. Count setup effort, moderation, reporting exports, tracking work, source review and troubleshooting alongside media cost. Evaluate destination load integrity with the same seriousness as delivery volume. A channel that appears cheaper may be less efficient when the team cannot identify sources or reconcile outcomes without manual repair.
Build the scorecard around decisions the team is prepared to execute. Device Behavior requires a defined owner, evidence window and stop rule; frequency control confirms whether the change survives beyond the front-end metric. Unknown values should stay unknown until measured. Estimating missing evidence merely to complete a table creates false confidence and weakens later optimization.
Build an equal evidence window for new-window or background-tab traffic
Build the scorecard around decisions the team is prepared to execute. Device Behavior requires a defined owner, evidence window and stop rule; frequency control confirms whether the change survives beyond the front-end metric. Unknown values should stay unknown until measured. Estimating missing evidence merely to complete a table creates false confidence and weakens later optimization.
Operational fit belongs in the economics of popunder ad network for advertisers. Count setup effort, moderation, reporting exports, tracking work, source review and troubleshooting alongside media cost. Evaluate source transparency with the same seriousness as delivery volume. A channel that appears cheaper may be less efficient when the team cannot identify sources or reconcile outcomes without manual repair.
Compare source mix instead of blended averages
Operational fit belongs in the economics of popunder ad network for advertisers. Count setup effort, moderation, reporting exports, tracking work, source review and troubleshooting alongside media cost. Evaluate source transparency with the same seriousness as delivery volume. A channel that appears cheaper may be less efficient when the team cannot identify sources or reconcile outcomes without manual repair.
A practical review of popunder ad network for advertisers must account for opaque sources, mismatched popunder context, weak journey continuity, duplicate activity, premature scaling and changing success rules. Document each material difference instead of hiding it inside a blended average. If settings, eligibility or source mix cannot be matched, record that limitation in the decision memo. A narrow result that can be reproduced is more valuable than a broad claim that cannot survive a second test.
Keep creative fairness without forcing identical assets
A practical review of popunder ad network for advertisers must account for opaque sources, mismatched popunder context, weak journey continuity, duplicate activity, premature scaling and changing success rules. Document each material difference instead of hiding it inside a blended average. If settings, eligibility or source mix cannot be matched, record that limitation in the decision memo. A narrow result that can be reproduced is more valuable than a broad claim that cannot survive a second test.
For new-window or background-tab traffic, begin with the business decision, not the delivery metric. Assign accepted session value to a named owner and state what evidence changes a bid, budget, source status or pause decision. Keep the definition fixed through the observation window. The useful output is an attributed popunder outcome that passes eligibility, deduplication and downstream acceptance rules, while early clicks and visits remain supporting signals rather than the final proof.
Reconcile attribution before choosing a source
For new-window or background-tab traffic, begin with the business decision, not the delivery metric. Assign accepted session value to a named owner and state what evidence changes a bid, budget, source status or pause decision. Keep the definition fixed through the observation window. The useful output is an attributed popunder outcome that passes eligibility, deduplication and downstream acceptance rules, while early clicks and visits remain supporting signals rather than the final proof.
Map the operational chain as eligible trigger to destination load to engaged session to accepted outcome. Preserve campaign, creative, source, device and GEO identifiers wherever the journey permits. Review trigger quality separately from device behavior so one strong average cannot conceal a weak segment. Reconcile front-end activity with the accepted business record before declaring the test successful or increasing spend.
Include policy and operational fit in the decision
Map the operational chain as eligible trigger to destination load to engaged session to accepted outcome. Preserve campaign, creative, source, device and GEO identifiers wherever the journey permits. Review trigger quality separately from device behavior so one strong average cannot conceal a weak segment. Reconcile front-end activity with the accepted business record before declaring the test successful or increasing spend.
Operational fit belongs in the economics of popunder ad network for advertisers. Count setup effort, moderation, reporting exports, tracking work, source review and troubleshooting alongside media cost. Evaluate destination load integrity with the same seriousness as delivery volume. A channel that appears cheaper may be less efficient when the team cannot identify sources or reconcile outcomes without manual repair.
Write a limited and reproducible conclusion
Operational fit belongs in the economics of popunder ad network for advertisers. Count setup effort, moderation, reporting exports, tracking work, source review and troubleshooting alongside media cost. Evaluate destination load integrity with the same seriousness as delivery volume. A channel that appears cheaper may be less efficient when the team cannot identify sources or reconcile outcomes without manual repair.
Operational fit belongs in the economics of popunder ad network for advertisers. Count setup effort, moderation, reporting exports, tracking work, source review and troubleshooting alongside media cost. Evaluate device behavior with the same seriousness as delivery volume. A channel that appears cheaper may be less efficient when the team cannot identify sources or reconcile outcomes without manual repair.
Four checks tied to this exact advertiser problem
These checks stop broad platform assumptions from distorting this specific search intent.
Confirm trigger quality before launch
For the device or GEO split scenario, isolate the smallest set of variables that can answer the question. Hold the accepted event, attribution window and destination logic steady. Change one bid, audience, source group or creative family at a time. If the result deteriorates, return to the last stable configuration rather than widening targeting to recover volume.
Keep destination load integrity visible
Source governance matters because new-window or background-tab traffic can change as budgets, bids and inventory conditions move. Classify sources as new, uncertain, promising, reduced or excluded. Apply one promotion rule and one exclusion rule across the test. Recheck source transparency after every material scale step, because a winning average may weaken when the source portfolio expands.
Validate frequency control independently
Build the scorecard around decisions the team is prepared to execute. Frequency Control requires a defined owner, evidence window and stop rule; trigger quality confirms whether the change survives beyond the front-end metric. Unknown values should stay unknown until measured. Estimating missing evidence merely to complete a table creates false confidence and weakens later optimization.
Tie accepted session value to the final memo
Map the operational chain as eligible trigger to destination load to engaged session to accepted outcome. Preserve campaign, creative, source, device and GEO identifiers wherever the journey permits. Review accepted session value separately from destination load integrity so one strong average cannot conceal a weak segment. Reconcile front-end activity with the accepted business record before declaring the test successful or increasing spend.
Six controls before the campaign buys scale
Each control must lead to an observable decision rather than a decorative report.
Trigger Quality
Map the operational chain as eligible trigger to destination load to engaged session to accepted outcome. Preserve campaign, creative, source, device and GEO identifiers wherever the journey permits. Review trigger quality separately from device behavior so one strong average cannot conceal a weak segment. Reconcile front-end activity with the accepted business record before declaring the test successful or increasing spend.
Evidence → owner → action → rollbackDestination Load Integrity
The measurement plan should connect raw delivery to an attributed popunder outcome that passes eligibility, deduplication and downstream acceptance rules. Record eligible exposure, source distribution, landing continuity, conversion status and downstream acceptance in separate layers. Use destination load integrity to diagnose where value is gained or lost. Do not let a lower cost per click override evidence that the final business event is weaker or less repeatable.
Evidence → owner → action → rollbackDevice Behavior
Operational fit belongs in the economics of popunder ad network for advertisers. Count setup effort, moderation, reporting exports, tracking work, source review and troubleshooting alongside media cost. Evaluate device behavior with the same seriousness as delivery volume. A channel that appears cheaper may be less efficient when the team cannot identify sources or reconcile outcomes without manual repair.
Evidence → owner → action → rollbackSource Transparency
For new-window or background-tab traffic, begin with the business decision, not the delivery metric. Assign source transparency to a named owner and state what evidence changes a bid, budget, source status or pause decision. Keep the definition fixed through the observation window. The useful output is an attributed popunder outcome that passes eligibility, deduplication and downstream acceptance rules, while early clicks and visits remain supporting signals rather than the final proof.
Evidence → owner → action → rollbackFrequency Control
Source governance matters because new-window or background-tab traffic can change as budgets, bids and inventory conditions move. Classify sources as new, uncertain, promising, reduced or excluded. Apply one promotion rule and one exclusion rule across the test. Recheck frequency control after every material scale step, because a winning average may weaken when the source portfolio expands.
Evidence → owner → action → rollbackAccepted Session Value
Map the operational chain as eligible trigger to destination load to engaged session to accepted outcome. Preserve campaign, creative, source, device and GEO identifiers wherever the journey permits. Review accepted session value separately from destination load integrity so one strong average cannot conceal a weak segment. Reconcile front-end activity with the accepted business record before declaring the test successful or increasing spend.
Evidence → owner → action → rollbackAn eight-step campaign operating sequence
Move from business definition to controlled scale without losing the source-to-outcome record.
- 01
Define the accepted event
Finish with a dated decision memo for new-window or background-tab traffic. State the tested scope, evidence window, excluded variables, source distribution, accepted result and rollback trigger. Explain how destination load integrity affected the conclusion and what new evidence would overturn it. This keeps the outcome useful after inventory, policy, pricing or campaign conditions change.
- 02
Verify eligibility and policy fit
Operational fit belongs in the economics of popunder ad network for advertisers. Count setup effort, moderation, reporting exports, tracking work, source review and troubleshooting alongside media cost. Evaluate device behavior with the same seriousness as delivery volume. A channel that appears cheaper may be less efficient when the team cannot identify sources or reconcile outcomes without manual repair.
- 03
Map the complete user journey
Build the scorecard around decisions the team is prepared to execute. Source Transparency requires a defined owner, evidence window and stop rule; accepted session value confirms whether the change survives beyond the front-end metric. Unknown values should stay unknown until measured. Estimating missing evidence merely to complete a table creates false confidence and weakens later optimization.
- 04
Create decision cells
Operational fit belongs in the economics of popunder ad network for advertisers. Count setup effort, moderation, reporting exports, tracking work, source review and troubleshooting alongside media cost. Evaluate frequency control with the same seriousness as delivery volume. A channel that appears cheaper may be less efficient when the team cannot identify sources or reconcile outcomes without manual repair.
- 05
Launch a bounded test
Map the operational chain as eligible trigger to destination load to engaged session to accepted outcome. Preserve campaign, creative, source, device and GEO identifiers wherever the journey permits. Review accepted session value separately from destination load integrity so one strong average cannot conceal a weak segment. Reconcile front-end activity with the accepted business record before declaring the test successful or increasing spend.
- 06
Classify sources consistently
Before spending on popunder ad network for advertisers, write the exact audience, country, device, format, destination and policy boundary. This prevents the campaign from drifting toward easier but less valuable delivery. During device or GEO split, compare like with like and preserve the original control. Any necessary exception should be visible in the final report with its reason and likely effect.
- 07
Validate downstream quality
Operational fit belongs in the economics of popunder ad network for advertisers. Count setup effort, moderation, reporting exports, tracking work, source review and troubleshooting alongside media cost. Evaluate destination load integrity with the same seriousness as delivery volume. A channel that appears cheaper may be less efficient when the team cannot identify sources or reconcile outcomes without manual repair.
- 08
Scale one reversible variable
Build the scorecard around decisions the team is prepared to execute. Device Behavior requires a defined owner, evidence window and stop rule; frequency control confirms whether the change survives beyond the front-end metric. Unknown values should stay unknown until measured. Estimating missing evidence merely to complete a table creates false confidence and weakens later optimization.
Measure the complete path, not the cheapest activity
Delivery layer
The measurement plan should connect raw delivery to an attributed popunder outcome that passes eligibility, deduplication and downstream acceptance rules. Record eligible exposure, source distribution, landing continuity, conversion status and downstream acceptance in separate layers. Use trigger quality to diagnose where value is gained or lost. Do not let a lower cost per click override evidence that the final business event is weaker or less repeatable.
Journey layer
Before spending on popunder ad network for advertisers, write the exact audience, country, device, format, destination and policy boundary. This prevents the campaign from drifting toward easier but less valuable delivery. During creative and placement comparison, compare like with like and preserve the original control. Any necessary exception should be visible in the final report with its reason and likely effect.
Acceptance layer
Before spending on popunder ad network for advertisers, write the exact audience, country, device, format, destination and policy boundary. This prevents the campaign from drifting toward easier but less valuable delivery. During device or GEO split, compare like with like and preserve the original control. Any necessary exception should be visible in the final report with its reason and likely effect.
Economics layer
Use source transparency as an action layer. Define the evidence threshold, the person responsible for review, the permitted response and the condition that restores the previous configuration. Pair it with accepted session value to confirm that improvement is not simply a change in traffic composition. Scale only after the accepted outcome remains stable through the required validation period.
Evidence required for each control
Score only evidence that can change a real campaign action.
| Control | Evidence | Decision |
|---|---|---|
| Trigger Quality | Build the scorecard around decisions the team is prepared to execute. Trigger Quality requires a defined owner, evidence window and stop rule; device behavior confirms whether the change survives beyond the front-end metric. Unknown values should stay unknown until measured. Estimating missing evidence merely to complete a table creates false confidence and weakens later optimization. | Keep, reduce, test, exclude or scale under the documented rule. |
| Destination Load Integrity | The measurement plan should connect raw delivery to an attributed popunder outcome that passes eligibility, deduplication and downstream acceptance rules. Record eligible exposure, source distribution, landing continuity, conversion status and downstream acceptance in separate layers. Use destination load integrity to diagnose where value is gained or lost. Do not let a lower cost per click override evidence that the final business event is weaker or less repeatable. | Keep, reduce, test, exclude or scale under the documented rule. |
| Device Behavior | Map the operational chain as eligible trigger to destination load to engaged session to accepted outcome. Preserve campaign, creative, source, device and GEO identifiers wherever the journey permits. Review device behavior separately from frequency control so one strong average cannot conceal a weak segment. Reconcile front-end activity with the accepted business record before declaring the test successful or increasing spend. | Keep, reduce, test, exclude or scale under the documented rule. |
| Source Transparency | For new-window or background-tab traffic, begin with the business decision, not the delivery metric. Assign source transparency to a named owner and state what evidence changes a bid, budget, source status or pause decision. Keep the definition fixed through the observation window. The useful output is an attributed popunder outcome that passes eligibility, deduplication and downstream acceptance rules, while early clicks and visits remain supporting signals rather than the final proof. | Keep, reduce, test, exclude or scale under the documented rule. |
| Frequency Control | The measurement plan should connect raw delivery to an attributed popunder outcome that passes eligibility, deduplication and downstream acceptance rules. Record eligible exposure, source distribution, landing continuity, conversion status and downstream acceptance in separate layers. Use frequency control to diagnose where value is gained or lost. Do not let a lower cost per click override evidence that the final business event is weaker or less repeatable. | Keep, reduce, test, exclude or scale under the documented rule. |
| Accepted Session Value | For the creative and placement comparison scenario, isolate the smallest set of variables that can answer the question. Hold the accepted event, attribution window and destination logic steady. Change one bid, audience, source group or creative family at a time. If the result deteriorates, return to the last stable configuration rather than widening targeting to recover volume. | Keep, reduce, test, exclude or scale under the documented rule. |
Four practical ways to use this framework
Adapt the framework to a bounded business problem without changing the underlying evidence rules.
New Popunder Source Test
Operational fit belongs in the economics of popunder ad network for advertisers. Count setup effort, moderation, reporting exports, tracking work, source review and troubleshooting alongside media cost. Evaluate source transparency with the same seriousness as delivery volume. A channel that appears cheaper may be less efficient when the team cannot identify sources or reconcile outcomes without manual repair.
Creative And Placement Comparison
The measurement plan should connect raw delivery to an attributed popunder outcome that passes eligibility, deduplication and downstream acceptance rules. Record eligible exposure, source distribution, landing continuity, conversion status and downstream acceptance in separate layers. Use frequency control to diagnose where value is gained or lost. Do not let a lower cost per click override evidence that the final business event is weaker or less repeatable.
Device Or Geo Split
Source governance matters because new-window or background-tab traffic can change as budgets, bids and inventory conditions move. Classify sources as new, uncertain, promising, reduced or excluded. Apply one promotion rule and one exclusion rule across the test. Recheck accepted session value after every material scale step, because a winning average may weaken when the source portfolio expands.
Source-Level Scale Review
Map the operational chain as eligible trigger to destination load to engaged session to accepted outcome. Preserve campaign, creative, source, device and GEO identifiers wherever the journey permits. Review trigger quality separately from device behavior so one strong average cannot conceal a weak segment. Reconcile front-end activity with the accepted business record before declaring the test successful or increasing spend.
Write the stop rules before the campaign starts
Before spending on popunder ad network for advertisers, write the exact audience, country, device, format, destination and policy boundary. This prevents the campaign from drifting toward easier but less valuable delivery. During new popunder source test, compare like with like and preserve the original control. Any necessary exception should be visible in the final report with its reason and likely effect.
Source governance matters because new-window or background-tab traffic can change as budgets, bids and inventory conditions move. Classify sources as new, uncertain, promising, reduced or excluded. Apply one promotion rule and one exclusion rule across the test. Recheck destination load integrity after every material scale step, because a winning average may weaken when the source portfolio expands.
Use device behavior as an action layer. Define the evidence threshold, the person responsible for review, the permitted response and the condition that restores the previous configuration. Pair it with frequency control to confirm that improvement is not simply a change in traffic composition. Scale only after the accepted outcome remains stable through the required validation period.
What to prevent before more budget enters the campaign
Measurement drift
Build the scorecard around decisions the team is prepared to execute. Destination Load Integrity requires a defined owner, evidence window and stop rule; source transparency confirms whether the change survives beyond the front-end metric. Unknown values should stay unknown until measured. Estimating missing evidence merely to complete a table creates false confidence and weakens later optimization.
Source-mix illusion
For new-window or background-tab traffic, begin with the business decision, not the delivery metric. Assign device behavior to a named owner and state what evidence changes a bid, budget, source status or pause decision. Keep the definition fixed through the observation window. The useful output is an attributed popunder outcome that passes eligibility, deduplication and downstream acceptance rules, while early clicks and visits remain supporting signals rather than the final proof.
Irreversible scale
Use source transparency as an action layer. Define the evidence threshold, the person responsible for review, the permitted response and the condition that restores the previous configuration. Pair it with accepted session value to confirm that improvement is not simply a change in traffic composition. Scale only after the accepted outcome remains stable through the required validation period.
Unsupported winner claims
Map the operational chain as eligible trigger to destination load to engaged session to accepted outcome. Preserve campaign, creative, source, device and GEO identifiers wherever the journey permits. Review trigger quality separately from device behavior so one strong average cannot conceal a weak segment. Reconcile front-end activity with the accepted business record before declaring the test successful or increasing spend.
Use realistic expectations and responsible controls
Traffic-quality controls can reduce risk but cannot eliminate every invalid interaction. Approval, inventory, delivery and results depend on campaign details, policy, GEO, format, bid, creative, destination, tracking and optimization. No page should be interpreted as a guarantee of traffic quality, conversions, ROI, ranking, approval or business performance.
A practical review of popunder ad network for advertisers must account for opaque sources, mismatched popunder context, weak journey continuity, duplicate activity, premature scaling and changing success rules. Document each material difference instead of hiding it inside a blended average. If settings, eligibility or source mix cannot be matched, record that limitation in the decision memo. A narrow result that can be reproduced is more valuable than a broad claim that cannot survive a second test.
Questions about popunder ad network for advertisers
What should advertisers evaluate in a popunder ad network for advertisers?
For new-window or background-tab traffic, begin with the business decision, not the delivery metric. Assign frequency control to a named owner and state what evidence changes a bid, budget, source status or pause decision. Keep the definition fixed through the observation window. The useful output is an attributed popunder outcome that passes eligibility, deduplication and downstream acceptance rules, while early clicks and visits remain supporting signals rather than the final proof.
How much budget should a first popunder ad network for advertisers test use?
Finish with a dated decision memo for new-window or background-tab traffic. State the tested scope, evidence window, excluded variables, source distribution, accepted result and rollback trigger. Explain how accepted session value affected the conclusion and what new evidence would overturn it. This keeps the outcome useful after inventory, policy, pricing or campaign conditions change.
Which metric matters most for popunder ad network for advertisers?
Use trigger quality as an action layer. Define the evidence threshold, the person responsible for review, the permitted response and the condition that restores the previous configuration. Pair it with device behavior to confirm that improvement is not simply a change in traffic composition. Scale only after the accepted outcome remains stable through the required validation period.
How should traffic quality be checked?
Finish with a dated decision memo for new-window or background-tab traffic. State the tested scope, evidence window, excluded variables, source distribution, accepted result and rollback trigger. Explain how destination load integrity affected the conclusion and what new evidence would overturn it. This keeps the outcome useful after inventory, policy, pricing or campaign conditions change.
Why is source-level reporting important?
Use device behavior as an action layer. Define the evidence threshold, the person responsible for review, the permitted response and the condition that restores the previous configuration. Pair it with frequency control to confirm that improvement is not simply a change in traffic composition. Scale only after the accepted outcome remains stable through the required validation period.
How long should the evidence window run?
Finish with a dated decision memo for new-window or background-tab traffic. State the tested scope, evidence window, excluded variables, source distribution, accepted result and rollback trigger. Explain how source transparency affected the conclusion and what new evidence would overturn it. This keeps the outcome useful after inventory, policy, pricing or campaign conditions change.
When should a source be paused?
Operational fit belongs in the economics of popunder ad network for advertisers. Count setup effort, moderation, reporting exports, tracking work, source review and troubleshooting alongside media cost. Evaluate frequency control with the same seriousness as delivery volume. A channel that appears cheaper may be less efficient when the team cannot identify sources or reconcile outcomes without manual repair.
Can popunder ad network for advertisers guarantee conversions?
Map the operational chain as eligible trigger to destination load to engaged session to accepted outcome. Preserve campaign, creative, source, device and GEO identifiers wherever the journey permits. Review accepted session value separately from destination load integrity so one strong average cannot conceal a weak segment. Reconcile front-end activity with the accepted business record before declaring the test successful or increasing spend.
How should a winning cell be scaled?
Map the operational chain as eligible trigger to destination load to engaged session to accepted outcome. Preserve campaign, creative, source, device and GEO identifiers wherever the journey permits. Review trigger quality separately from device behavior so one strong average cannot conceal a weak segment. Reconcile front-end activity with the accepted business record before declaring the test successful or increasing spend.
What belongs in the final decision memo?
Treat creative and placement comparison as a bounded experiment. Set a daily ceiling, a total loss limit, a minimum evidence window and a rollback point before launch. New sources begin in an uncertain state and earn promotion through the same rule. When sample size is thin, keep the decision open rather than forcing a winner from unstable data.