Additive scoring embodies a family resemblance structure with no necessary features.

Evidence

These two characteristics describe very well the polity numeric measure of democracy. None of the five indicators is necessary: all that matters is that a country has a high enough sum of indicators to pass the democracy threshold. — Gary Goertz, Social Science Concepts, 665

Categorization

• DEFINE: Ties a formal concept structure (family resemblance: minimum count, no common feature) to a concrete measurement rule.