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.
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