This article discusses three applications of Holland's theory in industrial
and organizational psychology. The first is his contribution to theory dev
elopment through the concept of person-environment congruence, which is cur
rently one of the dominant theoretical positions in organizational behavior
. The second is his contribution to using occupational information, most no
tably that individuals should be self-directed participants in their own ca
reer exploration. This position is evidenced in the 1991 revision of the Di
ctionary of Occupational Tides and will continue;with the Occupational Info
rmation Network (O*NET). The third is the application of vocational interes
t measurement in two current organizational practices: cross-functional tra
ining and the formation of work teams. It is concluded that Holland's work
represents a rare outcome - a source of influence on both the science and p
ractice bf industrial/organizational psychology. (C) 1999 Academic Press.