Design of Experiments (Fishbone)

Summary

Allows structured brainstorming about potential factors for a response variable to help you design an experiment. Potential factors are divided into standard categories (Uncontrollable Factors, Controllable Factors, Blockable Nuisance Factors, and Held-Constant Factors).

Answers the question:
  • What are the potential factors for a particular response variable?
When to Use Purpose
Mid-project Identify potential factors to help you design an experiment.

Data

No data requirements exist because you only use this tool to collect and organize data.

How-To

  1. Gather the project team and appropriate stakeholders for a brainstorming session.
  2. For each category (Uncontrollable Factors, Controllable Factors, Blockable Nuisance Factors, and Held-Constant Factors) list all factors. You may want to establish secondary categories for some or all of the primary categories, then list the factors under the secondary categories.
  3. Highlight factors that are deemed to be the most important by the team.
  4. Record the factors in a fishbone diagram using the DOE template.

Guidelines

  • Be sure to include project stakeholders in the brainstorming sessions for building the fishbone diagram.
  • If the standard categories are not appropriate for the problem, create new ones. Fishbone diagrams can include any type of cause you want to investigate.
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