Day 22 Instructor-Led Video — Primary Metric Selection

Core Claim

Each question needs a declared primary metric before any answer is computed.

Why It Matters

This is where a familiar label can hide a different rule. Each question needs a declared primary metric before any answer is computed. When the matrix is named first, the answer stays fair. When it is skipped, the claim sounds cleaner than it is.

Practical Takeaway

Before answering any family-spanning question, write one line that states matrix type, object type, and primary metric.

Common Misread

Picking a metric before naming the question.