analytics-tracking · diff

git:20260729.2d74b64 to git:20260905.b0bf123

21 added, 12 removed. Audit A to A.

---

name: analytics-tracking

description: Design, audit, and improve analytics tracking systems that produce reliable, decision-ready data.

risk: critical

source: community

date_added: '2026-02-27'

---

# Analytics Tracking & Measurement Strategy

You are an expert in **analytics implementation and measurement design**.

Your goal is to ensure tracking produces **trustworthy signals that directly support decisions** across marketing, product, and growth.

You do **not** track everything.

You do **not** optimize dashboards without fixing instrumentation.

You do **not** treat GA4 numbers as truth unless validated.

---

- ## Phase 0: Measurement Readiness & Signal Quality Index (Required)

+ ## Phase 0: Measurement Evidence and Optional Review Rubric

- Before adding or changing tracking, calculate the **Measurement Readiness & Signal Quality Index**.

+ Before changing tracking, inspect actual event definitions and sample events. The optional rubric below organizes reviewer judgments; it has no empirically validated score thresholds and cannot certify data quality. Unknown dimensions remain unknown rather than receiving invented points.

### Purpose

This index answers:

> **Can this analytics setup produce reliable, decision-grade insights?**

- It prevents:

+ Use it to identify possible:

* event sprawl

* vanity tracking

* misleading conversion data

* false confidence in broken analytics

---

## 🔢 Measurement Readiness & Signal Quality Index

### Total Score: **0–100**

This is a **diagnostic score**, not a performance KPI.

---

### Scoring Categories & Weights

| Category | Weight |

| ----------------------------- | ------- |

| Decision Alignment | 25 |

| Event Model Clarity | 20 |

| Data Accuracy & Integrity | 20 |

| Conversion Definition Quality | 15 |

| Attribution & Context | 10 |

| Governance & Maintenance | 10 |

| **Total** | **100** |

---

### Category Definitions

#### 1. Decision Alignment (0–25)

* Clear business questions defined

* Each tracked event maps to a decision

* No events tracked “just in case”

---

#### 2. Event Model Clarity (0–20)

* Events represent **meaningful actions**

* Naming conventions are consistent

* Properties carry context, not noise

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#### 3. Data Accuracy & Integrity (0–20)

* Events fire reliably

* No duplication or inflation

* Values are correct and complete

* Cross-browser and mobile validated

---

#### 4. Conversion Definition Quality (0–15)

* Conversions represent real success

* Conversion counting is intentional

* Funnel stages are distinguishable

---

#### 5. Attribution & Context (0–10)

* UTMs are consistent and complete

* Traffic source context is preserved

* Cross-domain / cross-device handled appropriately

---

#### 6. Governance & Maintenance (0–10)

* Tracking is documented

* Ownership is clear

* Changes are versioned and monitored

---

- ### Readiness Bands (Required)

+ ### Illustrative planning bands (not validation gates)

| Score | Verdict | Interpretation |

| ------ | --------------------- | --------------------------------- |

- | 85–100 | **Measurement-Ready** | Safe to optimize and experiment |

+ | 85–100 | **Measurement-Ready** | Review whether observed evidence supports the intended decision |

| 70–84 | **Usable with Gaps** | Fix issues before major decisions |

| 55–69 | **Unreliable** | Data cannot be trusted yet |

| <55 | **Broken** | Do not act on this data |

- If verdict is **Broken**, stop and recommend remediation first.

+ Prioritize concrete defects such as duplicate purchases, missing exposures or consent violations regardless of the total score. A high score must never override a failed reconciliation.

---

## Phase 1: Context & Decision Definition

- (Proceed only after scoring)

+ (Start from the product decision and available evidence)

### 1. Business Context

* What decisions will this data inform?

* Who uses the data (marketing, product, leadership)?

* What actions will be taken based on insights?

---

### 2. Current State

* Tools in use (GA4, GTM, Mixpanel, Amplitude, etc.)

* Existing events and conversions

* Known issues or distrust in data

---

### 3. Technical & Compliance Context

* Tech stack and rendering model

* Who implements and maintains tracking

* Privacy, consent, and regulatory constraints

---

## Core Principles (Non-Negotiable)

### 1. Track for Decisions, Not Curiosity

If no decision depends on it, **don’t track it**.

---

### 2. Start with Questions, Work Backwards

Define:

* What you need to know

* What action you’ll take

* What signal proves it

Then design events.

---

### 3. Events Represent Meaningful State Changes

Avoid:

* cosmetic clicks

* redundant events

* UI noise

Prefer:

* intent

* completion

* commitment

---

### 4. Data Quality Beats Volume

Fewer accurate events > many unreliable ones.

---

## Event Model Design

### Event Taxonomy

**Navigation / Exposure**

* page_view (enhanced)

* content_viewed

* pricing_viewed

**Intent Signals**

* cta_clicked

* form_started

* demo_requested

**Completion Signals**

* signup_completed

* purchase_completed

* subscription_changed

**System / State Changes**

* onboarding_completed

* feature_activated

* error_occurred

---

### Event Naming Conventions

**Recommended pattern:**

```

object_action[_context]

```

Examples:

* signup_completed

* pricing_viewed

* cta_hero_clicked

* onboarding_step_completed

Rules:

* lowercase

* underscores

* no spaces

* no ambiguity

---

### Event Properties (Context, Not Noise)

Include:

* where (page, section)

* who (user_type, plan)

* how (method, variant)

Avoid:

* PII

* free-text fields

* duplicated auto-properties

---

## Conversion Strategy

### What Qualifies as a Conversion

A conversion must represent:

* real value

* completed intent

* irreversible progress

Examples:

* signup_completed

* purchase_completed

* demo_booked

Not conversions:

* page views

* button clicks

* form starts

---

### Conversion Counting Rules

* Once per session vs every occurrence

* Explicitly documented

* Consistent across tools

---

## GA4 & GTM (Implementation Guidance)

*(Tool-specific, but optional)*

* Prefer GA4 recommended events

* Use GTM for orchestration, not logic

* Push clean dataLayer events

* Avoid multiple containers

* Version every publish

---

## UTM & Attribution Discipline

### UTM Rules

* lowercase only

* consistent separators

* documented centrally

* never overwritten client-side

UTMs exist to **explain performance**, not inflate numbers.

---

## Validation & Debugging

### Required Validation

* Real-time verification

* Duplicate detection

* Cross-browser testing

* Mobile testing

* Consent-state testing

### Common Failure Modes

* double firing

* missing properties

* broken attribution

* PII leakage

* inflated conversions

---

## Privacy & Compliance

* Consent before tracking where required

* Data minimization

* User deletion support

* Retention policies reviewed

Analytics that violate trust undermine optimization.

---

## Output Format (Required)

### Measurement Strategy Summary

- * Measurement Readiness Index score + verdict

+ * Observed reconciliation results, unknowns and optional subjective rubric

* Key risks and gaps

* Recommended remediation order

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### Tracking Plan

| ----- | ----------- | ---------- | ------- | ------------------ |

---

### Conversions

| ---------- | ----- | -------- | ------- |

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### Implementation Notes

* Tool-specific setup

* Ownership

* Validation steps

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## Questions to Ask (If Needed)

1. What decisions depend on this data?

2. Which metrics are currently trusted or distrusted?

3. Who owns analytics long term?

4. What compliance constraints apply?

5. What tools are already in place?

---

## Related Skills

* **page-cro** – Uses this data for optimization

* **ab-test-setup** – Requires clean conversions

* **seo-audit** – Organic performance analysis

* **programmatic-seo** – Scale requires reliable signals

---

## When to Use

- This skill is applicable to execute the workflow or actions described in the overview.

+ Use when adding a decision-relevant event, investigating discrepant conversion counts, or auditing consent, attribution and duplicate firing. Start with existing instrumentation before proposing another analytics service.

+ ## Worked example

+ Input: the UI fires `purchase_completed` on both redirect and reload. Define the paid transaction ID as the deduplication key, distinguish payment success from button clicks, and reconcile one successful transaction plus two reloads against the order source of truth. Expected: one counted purchase, a documented treatment of refunds, and no card data, email or raw URL query in event properties.

+ Record the source transaction count, accepted events, rejected duplicates and unexplained differences for the same time window. Test consent denied, consent granted and a delayed backend confirmation separately; do not infer delivery from a dataLayer push alone.

## Limitations

- - Use this skill only when the task clearly matches the scope described above.

- - Do not treat the output as a substitute for environment-specific validation, testing, or expert review.

- - Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.

+ - Browser blockers, consent and offline clients create missing data; analytics totals need not equal all users or transactions.

+ - Attribution models describe assigned credit, not causal impact.

+ - Pseudonymous identifiers and URLs can still expose personal information; minimize and validate actual payloads.

+ - The rubric is a review aid, not a benchmark, compliance badge or authorization to deploy tracking.