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This information is intended to convey the underlying concepts for Reclamation's decision processes. It is not mandatory.
See the Reclamation Manual for official Reclamation-wide requirements.

Reclamation's Decision Process Guide

toolboxAssumption Scatter Diagram

go through pageWhat / How / Go On


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navigate in the page--What Is It Good For?

A modified scatter diagram will help pinpoint which study assumptions are critical indicating a need to verify these assumptions. Alternatives will address needs only if underlying assumptions are on target, so examining and documenting your underlying assumptions is critical.


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navigate in the page--How Do I Use It?

  1. List assumptions.
  2. Examine each assumption, asking two questions: Is it certain? Is it critical?
  3. Draw a chart with certainty on the (x) axis and critical on the (y) axis.
  4. Mark where that assumption is on the chart.
  5. Analyze critical but uncertain assumptions.
  6. Document this analysis.


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navigate in the page--Go On

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Please contact Deena Larsen 303-445-2584 with questions or comments on this material.