Full Idea
Model theory determines only the relations between truth conditions, the reference of singular terms, the extensions of predicates, and the extensions of the logical terminology.
Gist of Idea
Model theory deals with relations, reference and extensions
Source
Stewart Shapiro (Philosophy of Mathematics [1997], 4.9)
Book Reference
Shapiro,Stewart: 'Philosophy of Mathematics:structure and ontology' [OUP 1997], p.139