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I learned about Journey Maps ~2012, only now finding out about Service Blueprints blog.practicalservicedesign.com/the-difference-between-a-journey-map-and-a-service-blueprint-31a6e24c4a6c "Front Stage / Back Stage" immediately brought to mind "Above the line / Below the line" from snafucatchers.github.io/#2_3_The_above-the-line/below-the-line_framework