![]() Classical techniques include multi-trait multi-method (MTMM) analysis (Campbell & Fiske, 1959). What you described has to do with what is know as convergent (to what extent items belonging to the same scale do correlate one with each other) and discriminant (items belonging to different scales should not correlate to a great extent) validity in psychometrics. Under CTT, this allows us to formalize individual "trait" propensity or liability as one's location on a continuous scale reflecting an underlying construct (a latent trait), although here it is merely an ordinal scale (but this another debate in the psychometrics literature). Here, as noted by a summary measure for your group of characteristics might be considered as the totalled (or sum) score of all items (a characteristic, in your words) belonging to what I will now refer to as a scale. Let me continue with the correlational approach, following the Classical Test Theory (CTT) framework. What suggested looks like a good start, if not the whole response (IMO).
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