
30 M
AJOR
T
HEORIES OF
C
AREER
D
EVELOPMENT
, C
HOICE
,
AND
A
DJUSTMENT
instru
ments are described in related chapters in this volume (Gore & Hitch, Chap-
ter 16; Hansen, Chapter 12; Ryan Krane & Tirre, Chapter 14).
RESEARCH ON HOLLAND’S THEORY
The acid test of any psychological theory or counseling practice must be the extent
to which a model is supported by rigorous scientific evidence. We urge readers to
consult the numerous scholarly reviews of the research on Holland’s theory in text-
books and professional journals, or better still, to read the original studies before
passing judgment on the weight of evidence and support for the theory. The Hol-
land system has been subjected to more empirical tests than any other model of ca-
reer development. A surprising amount (though certainly not all) of this research
has been supportive of the existence of a limited set of types, the underlying circu-
lar (or hexagonal) structure of those types, the validity of the instruments to mea-
sure types, though not to the same degree for the instruments designed to measure
environments, and, to a lesser extent, the interactive proposition of the theory.
Holland’s early studies (Holland, 1962) correlated VPI scores with a compre-
hensive set of self-descriptive adjectives (see Table 2.1) establishing the existence
and validity of the six types in large, representative high school samples and in
college populations. Similarly, educational environments (see, e.g., Astin & Hol-
land, 1961) and occupational environments using work activities (G. D. Gottfred-
son & Holland, 1991, 1996; Helms, 1996; Mount & Muchinsky, 1978; Smart &
Thompson, 2001; Toenjes & Borgen, 1974) were assessed consistent with theoreti-
cal predictions. Later studies explored the overlap between personality and in-
terests (Borgen, 1986; Costa, McCrae, & Holland, 1984; Larson, Rottinghaus, &
Borgen, 2002), self-ratings of abilities and skills (Swanson, 1993), and characteris-
tic behaviors (Wampold et al., 1995). Finally, the sizeable set of empirical studies
of person-environment congruence has been reanalyzed and summarized on
multiple occasions (Assouline & Meir, 1987; Spokane, 1985; Spokane et al., 2000;
Tinsley, 2000). The body of literature examining the validity of Holland’s
theory
is the largest and most diverse of any theory in vocational psychology. Be
cause
Table 2.2
Steps in Using the SDS
Source: Reproduced by special permission of the publisher, Psychological Assessment Resources, Inc.,
16204 North Florida Avenue, Lutz, Florida 33549, from the Self-Directed Search Professional User’s Guide,
by John L. Holland, PhD, Amy Powell, PhD, and Barbara Fritzsche, PhD. Copyright © 1985, 1987, 1994.
RI
ES
C
A
R=Realistic
I=Investigative
A=Artistic
S=Social
E=Enterprising
C=Conventional
Step 1:
Using the Assessment Booklet, a person:
• lists occupational aspirations
• indicates preferred activities in the six
areas
• reports competencies in the six areas
• indicates occupational preferences in
the six areas
• rates abilities in the six areas
• scores the responses he/she has given
and calculates six summary scores
• obtains a three-letter Summary Code
from the three highest summary scores
Step 2:
Using the Occupations Finder, a person
locates among the 1,335 occupations those
with codes that resemble his/her Summary Code.
Step 3:
The person compares the code for his/her current
vocational aspiration with the Summary Code to
determine the degree of agreement.
Step 4:
The person is encouraged to take “Some
Next Steps” to enhance the quality of his/
her decision making.
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