The voice assistant SPIX is used to help a field worker to follow a decision tree and analyse the root causes of a railroad crossing failure.

The advantage for the worker to navigate in a decision tree by voice are the following:

  – access to decision tree without having to know it
  – identify the failure and close the gap with the root cause
  – keep the hands free at work, focused on the identification of the failure

The worker may leave the hardware support (PC or tablet) away from his eyes to perform some actions. While coming back close to the screen he can control the results of his voice actions.