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incremental-excel-build

Build complex Excel files through staged, verifiable steps with intermediate CSV outputs for debugging

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# Incremental Excel Build Pattern

When creating complex Excel files with calculations, forecasts, or data transformations, use an **incremental build-and-verify** approach instead of monolithic scripts. This pattern breaks the workflow into discrete, testable stages with intermediate CSV outputs that can be inspected at each step.

## When to Use

- Creating Excel files with multiple data sources
- Complex calculations or forecasts that need validation
- Tasks where debugging intermediate results is important
- Workflows that may need to be re-run from a specific stage

## The Four-Stage Pattern

### Stage 1: Data Extraction