Focus on usability before technical details
Sometimes, devices fail in the marketplace because they have a fundamental usability problem
The cartridges are hard to swap out.
The cost of the device is too high.
The expectations are misaligned with the cost.
The weight of the device is too high.
The battery life is too short.
The appearance of the device is dated.
Last year I wrote an article titled "Don't let Engineers Define your Design" check it out. How can you use prototyping to ensure that your design is user-friendly?
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