User-friendliness

User-friendly is a term often used to describe software and other technologies. Its definition is subjective, depending on the user. Useful alternative terms are usability and accessibility, both from the field of human-computer interaction.

Certain parameters can be used to judge it include

adequacy:

Only necessary input should be required.

learnability:

Manuals and instructions should be clear.

robustness:

Impact of error should be inversely proportional to probability of error.

See also : newbie.