In proficiencies we next come to scale or measure of proficiencies in different skills areas. Clearly measures cannot be same. Measures on knowledge, for example cannot be used in domain experience. Similarly what is applicable for a sports area or creative area cannot be applied to engineering area.
IYS has researched how people indicate capabilities and proficiencies in different areas and has tailored the legends for the scale for different areas.
Note: From a different perspective, we really do not need to get into semantics on the legends on the scale. Today there is a sort of universally common understanding on what level to rate. On a daily basis we are rating food, food delivery, books, movies, cab service quality, mostly on a five point scale. We do not need to be provided with legend for the five levels. We have a sense of when to rate 4 or 3 or 5 for a particular food.
Now we come to the most tricky and tough part - measuring skills proficiencies.
IYS does not measure or assess proficiencies on the 100,000 skills across 32 categories. There are different ways we could handle this.
Lets go back to our report cards in schools. It has subjects for which the proficiencies are based on marks in the exams conducted. Then there are grades given for different behaviors observed like friendliness, communication. The former can be considered objective and the latter subjective. (Actually even the first is not fully objective. Different teachers could given different marks for the same answer to question.)
We cannot have a high level of objectivity to proficiency for different skills in different occupations.
We could have, however, different ways to get assessments based on the purpose for which the assessments are done and the viability of such assessments in today's world.
Sites like Upwork collect feedback on a five point scale when a project is completed. This is useful when we are considering a freelancer for our project. We can look at the previous scores the freelancers was given. This is sort of customer feedback