
Raise Your Confidence by Strategically Stacking Evidence
Late-stage design just hit a snag—now comes the moment that separates guesswork from great engineering. We walk through a clear, repeatable method to investigate unexpected failures and make high-impact decisions with confidence. Instead of hunting for a perfect test, we set a confidence target and stack multiple forms of imperfect evidence until we close the gap.
If you’re navigating late-stage product development and want a calm, methodical way to move from 40% to 90% confidence, this framework will help you choose the next best step, allocate limited time and budget, and know when to stop.
Join the Substack for monthly guides, templates, and Q&A where I help you apply these to your specific projects. Visit qualityduringdesign.substack.com.


Dianna Deeney
Dianna Deeney
In product development, the “fuzzy front end” of concept development often represents both tremendous opportunity and significant challenge. During this critical phase, teams are tasked with defining problems, understanding customers, and generating solutions—all before any engineering begins.
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