Conceptual change happens by adding previously excluded features to a definition.

Evidence

In many instances the unusual suspects might be controversial exactly because many people’s conceptualizations do not include them. It might be a large part of the discussion that one should add some new feature to the list. This is fundamentally what Sen was doing when he argued that income was insufficient for conceptualizing human well-being. One needed to add other dimensions such as political freedom, health, and education. — Gary Goertz, Social Science Concepts and Measurement, 495

Categorization

• XREF: Sen’s income critique grounds development studies’ shift to multidimensional poverty indices (HDI, MPI) — links to any work on measurement and development.
• SEED: Angle: ‘The politics of the added adjective’ — how every expansion of a concept (well-being, security, development) is really an argument about what was being ignored.