4. Our advice
4.1 Build a robust workgroup
The more varied your workgroup is, and the more regularly it includes people working on the process to be tested, the lower the risk of missing out on influential factors!
4.2 Limit levels per factor to the strict minimum
Keep to levels that will have a real impact, as the two extremes of a parameter (without it being zero) are often appropriate.
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Our advice
Mistakes to avoid
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