Own heuristics:

  • User see which symbol stand for wich instrument
  • User knows what he can do at this system status

The rating:
1 = Cosmetic problem only: need not be fixed unless extra time is available on project
2 = Minor usability problem: fixing this should be given low priority
3 = Major usability problem: important to fix, so should be given high priority
4 = Usability catastrophe: imperative to fix this before product can be released


  • It is to hard to choose an instrument. The menustyle and dimension should change. (4)
  • After you choose an instrument you can do no action. You need an "Undo"-action. (4)
    • It should be displayed the same menu all the time. But the user must not choose the same instrument. (3)
  • There is no help or description (2)
  • Clear symbols for the instruments (4)
  • The illustration of the time a user hit a menupoint looks not nice. (1)


  • The menu is showen all the time.
  • The menu looks like the picture, where you can choose instrument A, B or C. So, the user can easily choose an instrument. This is currently not implemented.
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