Why doesn’t this marker cap fit?


Bad Designs – Why doesn't this marker cap fit?

This is a fascinating website, full of examples of things that are designed poorly. Many of them are designed poorly because they don't include error proofing as a core principle, such as with this example. Good learnings for lean thinkers on this website.

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Mark Graban
Mark Graban is an internationally-recognized consultant, author, and professional speaker, and podcaster with experience in healthcare, manufacturing, and startups. Mark's new book is The Mistakes That Make Us: Cultivating a Culture of Learning and Innovation. He is also the author of Measures of Success: React Less, Lead Better, Improve More, the Shingo Award-winning books Lean Hospitals and Healthcare Kaizen, and the anthology Practicing Lean. Mark is also a Senior Advisor to the technology company KaiNexus.


  1. My kids have those markers. Beyond putting the cap back on, when you use the markers the same problem prevents the kids from easily getting the cap on the other end to store during use.

    Caps lost…even worse, I find them on the floor with my bare feet.



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