ReviewsREV-026
Read-only synthetic sample
Read-only synthetic sample · No real applicant data

REV-026 / Northstar Community Bank

Consumer underwriting Q1–Q2 2026

Unsecured consumer installment · Nimbus v4.1 → v4.2 · Jan 1 – Jun 30, 2026

MCMaya Chen · prepared / Ellis Morgan · independent reviewer
  1. Draft
  2. Data qualification
  3. Testing
  4. Challenge
  5. Management response
  6. Retest
  7. Complete

EFFECTIVE CHALLENGE

A question has an origin and a disposition.

Synthetic participants; local persistence only. No message is sent.

CH-018 · Finding / FL-024Additional evidence required

Explain why channel sensitivity was absent from the original specification and supply revised workpapers.

Requested evidence
EV-008 vendor scope; EV-010 revised channel specification
Recipient / due
Daniel Ortiz · 2026-09-19
Created by / at
Maya Chen · Sep 13, 12:15 PM ET
Access
Shared
DO
Daniel Ortiz · RESP-018-1Sep 15, 2:05 PM ET

We disagree that a difference alone warrants a model change. The original specification omitted channel sensitivity. We have supplied specification B; no decision-policy or model outputs changed.

Additional evidence required

The scope explanation is supported, but changing the analysis does not remediate the persisting outcome screen. Request policy rationale and a new action plan.

Maya Chen · Sep 16, 9:10 AM ET
CH-019 · Finding / AA-009Supported

Reconcile notice reason M-17 with the supplied principal factors.

Requested evidence
Original mapping, corrected mapping and sandbox replay
Recipient / due
Daniel Ortiz · 2026-09-16
Created by / at
Maya Chen · Sep 13, 1:00 PM ET
Access
Shared
DO
Daniel Ortiz · RESP-019-1Sep 16, 9:30 AM ET

M-17 incorrectly mapped utilization to credit-history wording. MAP-3.5-TEST maps utilization to the corresponding stated factor. The original notice remains preserved. Replay only, not a production release.

Supported

Compared original notice, principal factors and corrected replay. Both replay reasons are supported. Closure scope is the synthetic mapping defect only.

Ellis Morgan · Sep 16, 11:00 AM ET

Challenge chronology

Challenge created · CH-018Maya Chen · Challenge

Request supporting evidence

Inspect previous and new state
{
  "before": null,
  "after": {
    "originId": "FL-024",
    "question": "Provide the channel specification and document the change; second-line analysis is retained separately."
  }
}
Challenge created · CH-019Maya Chen · Challenge

Request supporting evidence

Inspect previous and new state
{
  "before": null,
  "after": {
    "originId": "AA-009",
    "question": "Reconcile notice reason M-17 with the supplied principal factors."
  }
}
Model-owner response received · CH-018Daniel Ortiz · Challenge

We disagree that a difference alone warrants a model change. The original specification omitted channel sensitivity. We have supplied specification B; no decision-policy or model outputs changed.

Inspect previous and new state
{
  "before": {
    "status": "Awaiting response"
  },
  "after": {
    "status": "Response received",
    "responseId": "RESP-018-1",
    "artifactIds": [
      "EV-008",
      "EV-010"
    ]
  }
}
Response disposition recorded · CH-018Maya Chen · Challenge

The scope explanation is supported, but changing the analysis does not remediate the persisting outcome screen. Request policy rationale and a new action plan.

Inspect previous and new state
{
  "before": {
    "status": "Response received"
  },
  "after": {
    "status": "Additional evidence required",
    "responseId": "RESP-018-1"
  }
}
Model-owner response received · CH-019Daniel Ortiz · Challenge

M-17 incorrectly mapped utilization to credit-history wording. MAP-3.5-TEST maps utilization to the corresponding stated factor. The original notice remains preserved. Replay only, not a production release.

Inspect previous and new state
{
  "before": {
    "status": "Awaiting response"
  },
  "after": {
    "status": "Response received",
    "responseId": "RESP-019-1",
    "artifactIds": [
      "EV-003",
      "EV-014"
    ]
  }
}
Response disposition recorded · CH-019Ellis Morgan · Challenge

Compared original notice, principal factors and corrected replay. Both replay reasons are supported. Closure scope is the synthetic mapping defect only.

Inspect previous and new state
{
  "before": {
    "status": "Response received"
  },
  "after": {
    "status": "Supported",
    "responseId": "RESP-019-1"
  }
}
Illustrative synthetic data · Northstar Community Bank is fictionalLocal mutable records · no production access controls