So, after the awkwardness over Electronics Skill vs. Engineering (Electronics), I decided to look up how exactly they are supposed to work. It turns out, they work like this: Level 0 skills have no specialization, and are generalized. Level 1+ skills have a specialization; the out-of-specialization versions of the skill can still be used at Level 0, unless those too are raised separately. References: How Mongoose Skills and Specializations Work Mongoose Traveller Skills and Specializations So, what to do? I figure there are 3 practical options; I'm not entirely sure which is most appropriate, because I don't know how Classic Traveller works and if it has any defaulting, and which version of Traveller we should be leaning towards: Skills that can be specialized start entirely specialized; there's no defaulting. We keep the character generation systems separate, judge them separately, and assume that they'll stay balanced We transition to one specific set of skills from either edition