A good theory should be able to encompass and explain a wide variety of both normal and abnormal behaviour
Jung – Myers Briggs Type Indicator
Eysenck
extraversion/introversion,
emotional stability / neuroticism
psychoticism
Gray
Reward sensitivity
Punishment sensitivity
Costa & McCrae
Parsimony
the theory should be economical in terms of the number of explanatoryconcepts it includes – all concepts included should be necessary to explain the phenomena.
