It is 40 years since Holland first proposed his theory of vocational choice
. In that period it is probably true to say that it has attracted more rese
arch than any other vocational guidance measure. This paper looks at the ce
ntral concept in his theory (congruence) and other areas of vocational guid
ance, namely "fit". It also looks at current research issues relating to Ho
lland's theory. Particular attention is paid to the research papers that ex
amine the overlap between the six (RAISEC) personality types of Holland and
the consensually accepted "Big Five" factor view of personality theorists.
Finally a summary of the major theoretical, empirical, and methodological
problems in the area is discussed.