Allport used to conduct research on personality.

the lexical approach

Explanation:

Gordon Allport was a respected and influential American scholar who worked in the field of psychology. Allport, son of a medical father and a teaching mother, was the youngest of four brothers. This translated into a keen interest in understanding human motivation, impulses and personality, which led him to develop the theory of personality traits. To conduct personality research, Allport used to use a lexical approach to reach his conclusions.

i r r e l e v a n t

all cities have a governor

all cities are in states or provnies then country

all cities have people

difference

some are rich

some are poor

some are average