Metric Contract
A documented definition of a measure, including its numerator, denominator, population, time window, exclusions, and owner.
- Meaning: fixes what the number represents
- Consistency: prevents local redefinition
- Governance: names who approves a change
Analytical Grain
The level represented by one row or observation, such as an order, customer-day, ticket event, or monthly account.
- Counting: determines what can be summed
- Joining: constrains valid table relationships
- Interpretation: distinguishes events from entities
Data Lineage
The trace from a reported value through transformations to the fields and events in source systems.
- Origin: identifies where facts were recorded
- Transformation: shows filters and calculations
- Diagnosis: locates breaks when values shift
Semantic Layer
A governed set of reusable business definitions that maps source fields to shared dimensions and metrics.
- Translation: connects technical fields to business meaning
- Reuse: applies one definition across reports
- Control: versions changes to calculated logic
Cohort
A group sharing a starting event or characteristic, observed over comparable time so behavior can be contrasted fairly.
- Alignment: gives members a common time origin
- Comparison: separates newer from mature populations
- Retention: tracks change after the starting event
Decision Threshold
A pre-established evidence level or operating boundary that triggers, changes, or withholds an action.
- Discipline: limits reaction to noise
- Tradeoff: reflects costs of false action and inaction
- Testability: makes the response observable