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For the example you have mentioned above, I would try to be more specific than communication skills are this is a broad range of skills (verbal, written, influencing, directing, presentation skills, etc).You are right in suggesting you will need to link the skills back to what a trainee does. This doesn’t necessarily need to be technical processes, it could just be the manner in which they work, who they have to work with etc.
For the example you have mentioned above, I would try to be more specific than communication skills are this is a broad range of skills (verbal, written, influencing, directing, presentation skills, etc).
You are right in suggesting you will need to link the skills back to what a trainee does. This doesn’t necessarily need to be technical processes, it could just be the manner in which they work, who they have to work with etc.