How to evaluate the ease of use of software?

Question

Programming

The task arose to evaluate the ease of use of the program, and not just "complex-simple", but more objectively ... Maybe there are some rating systems that give a specific number that evaluates simplicity, say, on a 10-point scale or something in this kind. I will be grateful for help.

Answer 1

focus group?

Answer 2

12+
if children can master then the software can be called simple