Goals

• It must be useful, and this usefulness must be measurable.
• The less interaction required, the better. For example, why use both hands when you can use just one.
• Device should not disturb you from daily tasks.
• It must be safe to wear.
• Device must be easily extensible.
  • On software level:
    1. It should be relatively easy to write your own extensions.
    2. The only thing required to change the client code is a text editor. By using interpreted languages we can make it possible to edit the code as soon as you get some idea.
  • On hardware level:
    1. Ring, SPI and !I²C ports to allow pluggable modules.
    2. Excessive hardware features. Things like barometer or accelerometer are not required for basic operation, but they provide freedom of thought for developers.
• All development files must be released under a free software license. Besides boosting development speed by letting others to contribute, these files might come handy for other projects.

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