The towers of glasses that stack up at summer camp could become permanently wedged into a long cylindrical monolith were it not for the fins inside that prevent the glass from nesting all the way down.


Mistake-proofin g category: Mistake prevention
Setting function: Physical
Regulatory function: Shutdown
Source: Off-the-shelf


Secondary Problems (side effects, weakness or concerns) with this example:

The fins make it very difficult to clean the cup effectively. A more effective design would be to place the fins on the outside of the top part of the glass rather than on the inside of the lower part. Outside lugs would: 1. be much easier to clean 2. be less critical to keep clean, having no contact with food 3. have the added benefit of preventing the glass from rolling on the table 4. improve the grip.


Sources of Supply:

See also:

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