16.- Usability

It refers to the degree to which a software can be used by specified consumers to achieve quantified objectives with effectiveness, efficiency, and satisfaction in a quantified context of use.

Indicators of Usability

It follows a list of possible usability indicators for a software-defined GNSS receiver:

  • Availability of a (versioned) User Manual.
  • Availability of a (versioned and documented) application programming interface (API).
  • Availability of graphical user interface.
  • Availability of accessibility mechanisms for users who experience disabilities.
  • Availability of mechanisms for remote operation.
  • Availability of interfaces with other programming languages.
  • Availability of user documentation: tutorials, detailed howtos, user stories, etc.

For the project, product or service in which the software receiver has a role:

  • Website of project, product or service.
  • Availability of professional help desk support services.
  • Availability of communication channels with other users and the development team.
    • Public mailing list.
    • Presence in public IRC channels.
    • resence in social networks.

For the computing platform executing the software receiver:

  • For physical devices:
    • Computer form factor, shape, size and weight.
    • Power consumption / battery autonomy.
    • Degrees of protection from solid objects and liquids, given by the Ingress Protection rating system. Examples:
      • IP65: protection from dust and from low pressure jets of water in all directions. Limited water ingress permitted.
      • IP67: protection from dust and against the effects of immersion in water to depth between 15 cm and 1 meter.
    • Temperature / humidity / vibration operative ranges.
  • For cloud–based services:
    • Input/output data throughput requirements.
    • Computational and memory bandwidth requirements.
    • Connection to third parties in case of assisted or differential GNSS.

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