# Monitor Data Integrity

> Design and operate a data integrity monitoring programme based on ALCOA+ principles. Covers detective controls, audit trail review schedules, anomaly detection patterns (off-hours activity, sequential modifications, bulk changes), metrics dashboards, investigation triggers, and escalation matrix definition. Use when establishing a data integrity monitoring programme for GxP systems, preparing for inspections where data integrity is a focus area, after a data integrity incident requiring enhanced monitoring, or when implementing MHRA, WHO, or PIC/S guidance.

- Skill: `pjt222/monitor-data-integrity-9` (Agent Skill)
- Install (CLI): `npx skillmds@latest add pjt222/monitor-data-integrity-9`
- Raw SKILL.md: https://api.skillmd.com/api/skills/pjt222/monitor-data-integrity-9/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Security
- License: MIT
- Author: pjt222 (https://skillmd.com/u/pjt222)
- Updated: 2026-09-21
- Page: https://skillmd.com/skills/pjt222/monitor-data-integrity-9

---


# 監數整

立 ALCOA+ 之程：察、警、究。

## 用

- GxP 系→立程
- 巡視前→備
- 事故後→加察
- 控之週校
- 行 MHRA/WHO/PIC/S 之導

## 入

- **必**：在範系+ALCOA+ 險像
- **必**：適導（MHRA、WHO TRS 996、PIC/S PI 041）
- **必**：各系現審跡能
- **可**：舊發現/巡觀
- **可**：現程/指
- **可**：權陣+角定

## 行

### 一：察 ALCOA+ 姿

各系對 ALCOA+ 諸原則：

```markdown
# Data Integrity Assessment
## Document ID: DIA-[SITE]-[YYYY]-[NNN]

### ALCOA+ Assessment Matrix

| Principle | Definition | Assessment Questions | System 1 | System 2 |
|-----------|-----------|---------------------|----------|----------|
| **Attributable** | Who performed the action and when? | Are all entries linked to unique user IDs? Is the timestamp system-generated? | G/A/R | G/A/R |
| **Legible** | Can data be read and understood? | Are records readable throughout retention period? Are formats controlled? | G/A/R | G/A/R |
| **Contemporaneous** | Was data recorded at the time of the activity? | Are timestamps real-time? Are backdated entries detectable? | G/A/R | G/A/R |
| **Original** | Is this the first-captured data? | Are original records preserved? Is there a clear original vs copy distinction? | G/A/R | G/A/R |
| **Accurate** | Is the data correct and truthful? | Are calculations verified? Are transcription errors detectable? | G/A/R | G/A/R |
| **Complete** | Is all data present? | Are deletions detectable? Are all expected records present? | G/A/R | G/A/R |
| **Consistent** | Are data elements consistent across records? | Do timestamps follow logical sequence? Are versions consistent? | G/A/R | G/A/R |
| **Enduring** | Will data survive for the required retention period? | Is the storage medium reliable? Are backups verified? | G/A/R | G/A/R |
| **Available** | Can data be accessed when needed? | Are retrieval procedures documented? Are access controls appropriate? | G/A/R | G/A/R |

Rating: G = Good (controls adequate), A = Adequate (minor improvements needed), R = Remediation required
```

**得：** 各系皆有評＋具發現。
**敗：** 不能評→旗為要隙→即補。

### 二：設察控

定察違整之動：

```markdown
# Detective Controls Design
## Document ID: DCD-[SITE]-[YYYY]-[NNN]

### Audit Trail Review Schedule
| System | Review Type | Frequency | Reviewer | Scope |
|--------|-----------|-----------|----------|-------|
| LIMS | Comprehensive | Monthly | QA | All data modifications, deletions, and access events |
| ERP | Targeted | Weekly | QA | Batch record modifications and approvals |
| R/Shiny | Comprehensive | Per analysis | Statistician | All input/output/parameter changes |

### Review Checklist
For each audit trail review cycle:
- [ ] All data modifications have documented justification
- [ ] No unexplained deletions or void entries
- [ ] Timestamps are sequential and consistent with business operations
- [ ] No off-hours activity without documented justification
- [ ] No shared account usage detected
- [ ] Failed login attempts are within normal thresholds
- [ ] No privilege escalation events outside change control
```

**得：** 控有期、有人、有則。
**敗：** 過期未審→記隙→升 QA。

### 三：定異模

具觸究之模：

```markdown
# Anomaly Detection Patterns

### Pattern 1: Off-Hours Activity
**Trigger:** Data creation, modification, or deletion outside business hours (defined as [06:00-20:00 local time, Monday-Friday])
**Threshold:** Any GxP-critical data modification outside defined hours
**Response:** Verify with user and supervisor within 2 business days
**Exceptions:** Documented shift work, approved overtime, automated processes

### Pattern 2: Sequential Modifications
**Trigger:** Multiple modifications to the same record within a short timeframe
**Threshold:** >3 modifications to the same record within 60 minutes
**Response:** Review modification reasons; verify each change has documented justification
**Exceptions:** Initial data entry corrections within [grace period, e.g., 30 minutes]

### Pattern 3: Bulk Changes
**Trigger:** Unusually high volume of data modifications by a single user
**Threshold:** >50 modifications per user per day (baseline: [calculate from normal usage])
**Response:** Verify business justification for bulk activity
**Exceptions:** Documented batch operations, data migration activities under change control

### Pattern 4: Delete/Void Spikes
**Trigger:** Unusual number of record deletions or voidings
**Threshold:** >5 delete/void events per user per week
**Response:** Immediate QA review of deleted/voided records
**Exceptions:** None — all delete/void events require documented justification

### Pattern 5: Privilege Escalation
**Trigger:** User access changes granting administrative or elevated privileges
**Threshold:** Any privilege change outside the user access management SOP
**Response:** Verify with IT security and system owner within 24 hours
**Exceptions:** Emergency access per documented emergency access procedure

### Pattern 6: Audit Trail Gaps
**Trigger:** Missing or interrupted audit trail entries
**Threshold:** Any gap > 0 entries (audit trail should be continuous)
**Response:** Immediate investigation — potential system malfunction or tampering
**Exceptions:** None — audit trail gaps are always critical
```

**得：** 模具、可量、可動。
**敗：** 太低（偽警繁）→依基線調；太高（漏實）→首巡後緊。

### 四：建指板

```markdown
# Data Integrity Metrics Dashboard
## Document ID: DIMD-[SITE]-[YYYY]-[NNN]

### Key Performance Indicators

| KPI | Metric | Target | Yellow Threshold | Red Threshold | Source |
|-----|--------|--------|-----------------|---------------|--------|
| DI-01 | Audit trail review completion rate | 100% | <95% | <90% | Review log |
| DI-02 | Anomalies detected per month | Trending down | >10% increase MoM | >25% increase MoM | Anomaly log |
| DI-03 | Anomaly investigation closure rate | <15 business days | >15 days | >30 days | Investigation log |
| DI-04 | Open data integrity CAPAs | 0 overdue | 1-2 overdue | >2 overdue | CAPA tracker |
| DI-05 | Shared account instances detected | 0 | 1-2 | >2 | Access review |
| DI-06 | Unauthorised access attempts | <5/month | 5-10/month | >10/month | System logs |
| DI-07 | Audit trail gap events | 0 | N/A | >0 (always red) | System monitoring |

### Reporting Cadence
| Report | Frequency | Audience | Owner |
|--------|-----------|----------|-------|
| DI Metrics Summary | Monthly | QA Director, System Owners | QA Analyst |
| DI Trend Report | Quarterly | Quality Council | QA Manager |
| DI Annual Review | Annual | Site Director | QA Director |
```

**得：** 板一覽合規＋升觸。
**敗：** 源不能自動→人工＋計劃。

### 五：立究與升

```markdown
# Investigation and Escalation Matrix

### Investigation Triggers
| Trigger | Severity | Response Time | Investigator |
|---------|----------|---------------|-------------|
| Audit trail gap detected | Critical | Immediate (within 4 hours) | IT + QA |
| Confirmed data falsification | Critical | Immediate (within 4 hours) | QA Director |
| Anomaly pattern confirmed after review | Major | Within 5 business days | QA Analyst |
| Repeated anomalies from same user | Major | Within 5 business days | QA + HR |
| Overdue audit trail review | Minor | Within 10 business days | QA Manager |

### Escalation Path
| Level | Escalated To | When |
|-------|-------------|------|
| 1 | System Owner | Any confirmed anomaly |
| 2 | QA Director | Major or critical finding |
| 3 | Site Director | Critical finding or potential regulatory impact |
| 4 | Regulatory Affairs | Confirmed data integrity failure requiring regulatory notification |
```

**得：** 各究有重、限、升。
**敗：** 逾限未畢→升一級。

### 六：成監計

合諸件為主計：

```markdown
# Data Integrity Monitoring Plan
## Document ID: DI-MONITORING-PLAN-[SITE]-[YYYY]-[NNN]

### 1. Purpose and Scope
[From assessment scope]

### 2. ALCOA+ Assessment Summary
[From Step 1]

### 3. Detective Controls
[From Step 2]

### 4. Anomaly Detection Rules
[From Step 3]

### 5. Metrics and Reporting
[From Step 4]

### 6. Investigation and Escalation
[From Step 5]

### 7. Periodic Review
- Monitoring plan review: Annual
- Anomaly thresholds: Adjust after each quarterly review
- ALCOA+ re-assessment: When systems change or new systems are added

### 8. Approval
| Role | Name | Signature | Date |
|------|------|-----------|------|
| QA Director | | | |
| IT Director | | | |
| Site Director | | | |
```

**得：** 一已批之文定全程。
**敗：** 過大→主計+各系附程。

## 驗

- [ ] 諸範系皆評 ALCOA+
- [ ] 審跡日表定（期、範、人）
- [ ] 至少五異模＋具閾
- [ ] 板有 KPI＋綠黃紅閾
- [ ] 究觸有重＋應期
- [ ] 升路達監管事務（要事）
- [ ] 計經 QA＋IT 批
- [ ] 週校期定

## 忌

- **察而不動**：採指不究→偽安、生未理證據
- **靜閾**：猜閾→偽警繁→警疲
- **審跡作勾**：不識何察→無效→訓人辨模
- **忽系限**：跡能弱→錄限＋補控、勿假裝
- **無趨**：個異微→跨時跨人成系疾→必趨

## 參

- `design-compliance-architecture`
- `implement-audit-trail`
- `investigate-capa-root-cause`
- `conduct-gxp-audit`
- `prepare-inspection-readiness`