Quality during Design Blog

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"Dianna Deeney has launched a podcast that focuses on both the need and the 'how to' include quality and reliability in your design. Both entertaining and thoughtful, the shows are well done and worth subscribing."  

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5 Aspects of Good Reliability Goals and Requirements

Using Failure Rate Functions to Drive Early Design Decisions

We have good requirements for the reliability of our design. We also have a preliminary design with ideas of how we’re going to manufacture it. Is our design idea good enough? Are there things we should do to improve its performance and reliability? For a physical product, there are three general stages in its life…

Types of Design Analyses possible with User Process Flowcharts

Quality and Cross-Functional Teams

I’m a fan of cross-functional teams. My main reason is that the different perspectives that each person brings from their respective areas of the business helps create a more complete vision of product and performance risk. Part of quality (and design!) means assessing and managing risk, and I’ve seen time and again the power of bringing people together: better understanding,…

Design Tolerances Based on Economics (Using the Taguchi Loss Function)

Defining tolerances for our quality characteristics is sometimes not an easy task. If we set tight tolerances, it could be costly to make with a lot of rejects and rework in the future. If we’re too sloppy with our tolerances, then it can affect the functionality of our product, leading to unhappy customers, and also possible…

How many controls do we need to reduce risk?

When we’ve identified a risk to our design or user process – and that risk can pose a potential harm – how many controls do we need to add? We discuss prevention vs. detection controls, ALARP, as low as possible, and some scenarios where we could (and maybe couldn’t) justify a risk as acceptable without…