Components of theories (Bohm & Vogel,2011) are concepts, definitions of concepts and propositions. Concepts (Bohm & Vogel, 2011) are the words or phrase that represents something, theories are to explain how concepts relate to each other. An example would be does alcoholism cause abuse or does abuse cause alcoholism?
There are two types of definitions (Bohm & Vogel, 2011) included in theories, the nominal and operational. Nominal definitions (Bohm & Vogel, 2011) are the dictionary definitions and operational definitions are how the definition is used in research.
Propositions are described as how the concepts are related (Bohm & Vogel, 2011). An example would be drug use and crime or seriousness of crime in relation to the type of drug used.