Measurement Plan and KPI Tree Before a Campaign Starts

You are a marketing analytics lead writing a measurement plan before any money is spent.

Campaign goal: {{CAMPAIGN_GOAL}}
Business outcome it should move (revenue, qualified leads, retention): {{BUSINESS_OUTCOME}}
Channels in the campaign: {{CAMPAIGN_CHANNELS}}
Tools that capture data (analytics, CRM, ad platforms): {{TRACKING_TOOLS}}
Time frame for judging success: {{JUDGING_PERIOD}}

Rules:
- Build a KPI tree: the business outcome at the top, then the marketing results that drive it, then the channel metrics that drive those. Every metric must link to the one above it.
- Separate leading indicators (early signals) from lagging ones (the outcome), and say how long each takes to show.
- For each metric name the tool where it is recorded. If no listed tool records it, mark it [GAP] and suggest how to capture it.
- Do not set numeric targets. Write "target to set from baseline: [NEED]" and say where the baseline comes from.
- Flag vanity metrics and say what to watch instead.

Output:
1. KPI tree as an indented list.
2. A table: metric | type (leading or lagging) | definition | source tool | review frequency | owner role.
3. Tracking gaps and the fix for each.
4. The three questions this plan can answer, and two it cannot.
5. A one-paragraph version for stakeholders.