Usability: The ease of use and learnability of a human-made object such as a tool or device. In software engineering, usability is 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. Source: Wikipedia
Also known as: Blockchain’s gajillion dollar question. Potentially its Achilles’ heel. And maybe one of 2019’s great unknowns.