Research has a skill cap formula:
Max Skill = (Level - 15)*5
However from 16-18, your default skill of 16 in Research, exceeds this cap, and you are not allowed to skill up.
Once you reach Level 19 -- (19-15)*5=20 -- You can increase your skill again.
This is one of the largest problems with research. Spell combines are not able to be trivial until you are 4-5 levels past them. So you end up having to do combines underskill and risk failures.
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