Från sidan 21 i The Strange Core:
Remember that if you gain a skill that you’re already trained in, you become specialized in that skill. Because skill descriptions can be nebulous, determining whether you’re trained or specialized might take some thinking. For example, if you’re trained in lying and later gain a benefit that grants you skill with all social interactions, you become specialized in lying and trained in all other types of interactions. Being trained three times in a skill is no better than being trained twice (in other words, specialized is as good as it gets).