# Faultprint Structural Assessment: Fannie Mae

## Assessment Boundary

This assessment identifies document-visible structural conditions. It does not assert institutional failure, illegality, misconduct, causation, or future outcomes.

## Corpus Position

|field|value|
|---|---|
|Institution|Fannie Mae|
|Sector|Mortgage underwriting|
|Corpus reviewed|Public source materials represented in the current operating library.|
|Assessment scope|Selected source-anchored operating rows for example assessment formatting.|

## Module Screen

|module|screen result|reason|
|---|---|---|
|Contestability Lag|not visible in selected rows|No source-anchored finding selected for this module.|
|AI Authority Acceleration|visible condition|Manual underwriting and optional validation|
|Record-Authority Capture|not visible in selected rows|No source-anchored finding selected for this module.|
|Access Interruption Before Review|not visible in selected rows|No source-anchored finding selected for this module.|
|Documentation Burden Transfer|not visible in selected rows|No source-anchored finding selected for this module.|
|Classification Gatekeeping|visible condition|Automated underwriting authority|
|Evidence-Container Illusion|not screened as standard module|Pilot module; use only with strong source support.|
|Multi-Actor Handoff Diffusion|pilot condition visible|Use only with visible source support and boundary language.|
|Deadline Compression|not screened as standard module|Pilot module; use only with strong source support.|

## Findings

### FP-F-001: Manual underwriting and optional validation

|field|content|
|---|---|
|Module|AI Authority Acceleration|
|Condition name|Manual underwriting and optional validation|
|Source anchor|Lenders may use automated or manual underwriting; DU Validation Service is optional and borrower participation may not be required.|
|Source location|https://selling-guide.fanniemae.com/sel/b3-2-01/general-information-du|
|Why it matters structurally|Operating row shows a condition also present in postmortem libraries, but current public evidence is not enough to treat it as high exposure.|
|Boundary|Does not prove controls are operationally strong.|
|Falsification evidence|Operational records showing manual underwriting is discouraged or rarely available would weaken this mitigant.|

### FP-F-002: Automated underwriting authority

|field|content|
|---|---|
|Module|Classification Gatekeeping|
|Condition name|Automated underwriting authority|
|Source anchor|DU is described as an automated mortgage loan underwriting system used to assess credit risk and establish eligibility for sale and delivery to Fannie Mae.|
|Source location|https://singlefamily.fanniemae.com/applications-technology/desktop-underwriter-desktop-originator|
|Why it matters structurally|Operating row shows a condition also present in postmortem libraries, but current public evidence is not enough to treat it as high exposure.|
|Boundary|Does not prove DU outputs are unchallengeable or harmful.|
|Falsification evidence|Records showing DU outputs are routinely independently reviewed and corrected before downstream reliance would downgrade exposure.|

### FP-F-003: DU Validation vendor dependency

|field|content|
|---|---|
|Module|Multi-Actor Handoff Diffusion|
|Condition name|DU Validation vendor dependency|
|Source anchor|Fannie Mae states DU validation service uses third-party data vendors to independently validate borrower income, employment, and asset data.|
|Source location|https://singlefamily.fanniemae.com/applications-technology/desktop-underwriter-validation-service/du-validation-service-verification-report-vendors|
|Why it matters structurally|Operating row shows a condition also present in postmortem libraries, but current public evidence is not enough to treat it as high exposure.|
|Boundary|Does not establish that vendor validation is wrong or harmful in any particular loan file.|
|Falsification evidence|Vendor quality reports and reconciliation logs showing low error and strong correction would downgrade exposure.|

## Evidence Ledger

|evidence id|document/source|anchor|supports finding|
|---|---|---|---|
|E-001|https://selling-guide.fanniemae.com/sel/b3-2-01/general-information-du|Lenders may use automated or manual underwriting; DU Validation Service is optional and borrower participation may not be required.|FP-F-001|
|E-002|https://singlefamily.fanniemae.com/applications-technology/desktop-underwriter-desktop-originator|DU is described as an automated mortgage loan underwriting system used to assess credit risk and establish eligibility for sale and delivery to Fannie Mae.|FP-F-002|
|E-003|https://singlefamily.fanniemae.com/applications-technology/desktop-underwriter-validation-service...|Fannie Mae states DU validation service uses third-party data vendors to independently validate borrower income, employment, and asset data.|FP-F-003|

## Counter-Signals

|counter-signal|source location|effect on finding|
|---|---|---|
|Lenders may use automated or manual underwriting; DU Validation Service is optional and borrower participation may not be required.|https://selling-guide.fanniemae.com/sel/b3-2-01/general-information-du|May narrow or weaken the condition if confirmed by operating records.|

## Falsification Checklist

|finding|records that would weaken or rebut the finding|
|---|---|
|FP-F-001|Operational records showing manual underwriting is discouraged or rarely available would weaken this mitigant.|
|FP-F-002|Records showing DU outputs are routinely independently reviewed and corrected before downstream reliance would downgrade exposure.|
|FP-F-003|Vendor quality reports and reconciliation logs showing low error and strong correction would downgrade exposure.|

## Non-Claims

- This assessment does not recommend institutional action.
- This assessment does not predict failure.
- This assessment does not assert illegality.
- This assessment does not score the institution against a public benchmark.