Specificity in interest measurement: Basic Interest Scales and major field of study

The Basic Interest Scales (BISs) of the Strong Interest Inventory (SII; Harmon, Hansen, Borgen, & Hammer, 1994) have a 35-year history. The BISs are the specific content scales of the SII, as opposed to the SII general content scales, the General Occupational Themes (GOTs), which measure the six Holland (1997) RIASEC themes. Using 17,074 participants from the 1994 SII national norm group who majored in 24 different areas, this study examined the incremental value of the specific BISs over the general GOTs in explaining major field of education or training. Multivariately, discriminant function analyses were used to compare the ability of the set of the six GOTs and the set of the 25 BISs to predict the 24 major fields. Results showed substantial increases in explanatory power when the BISs were added to the GOTs. For 22 of the 24 fields, the addition of BISs to the GOTs added significantly to prediction of the major. These results showed that specific interest scales, such as the BISs, are highly useful in explaining specific criteria, such as choice of major field of education or training.     

The validity of the Holland and Basic Interest scales of the Strong Vocational Interest Blank: Leisure activities versus occupational membership as criteria

This study compared leisure activities with occupational membership as criteria for determining the concurrent validity of the Holland and Basic Interest scales of the Strong Vocational Interest Blank (Form T399). Subjects were 89 thirty-six-year-old males representing a variety of occupations. R. H. Dolliver's (Journal of Counseling Psychology, 1975, 22, 199–203) two methods for assessing validity were used: highest single scores on relevant scales and scores above established cutoff points on relevant scales. Results indicated greater congruence between interest scales and occupations than interest scales and leisure activities, except when Basic Interest scale cutoff scores were used. After chance factors were taken into account, Holland scales were found to be more accurate than Basic Interest scales in identifying occupations and in identifying leisure activities when highest scale scores were used. Using cutoff scores, Basic Interest scales were more accurate than Holland scales in identifying leisure activities. Supplementary analyses indicated that the validity of the Holland and Basic Interest scales increases when they are presumed to reflect either current occupation or preferred leisure activity. Results of this study were compared with Dolliver's (1975) findings.     

Development and initial validation of brief public domain RIASEC marker scales

Although commercially developed interest measures based on Holland’s RIASEC types are effectively used in a variety of applied settings, these measures have somewhat limited research utility due to their length and copyright restrictions placed by the test publishers. In the present study, two sets of 8-item RIASEC scales were developed using activity-based items selected from the 30-item RIASEC scales of the Interest Profiler, and two sets of 8-item RIASEC scales were developed using sets of 30 occupational job titles selected from the O∗NET database representing each Holland type. Responses to the items were obtained from three samples of college students with a total of 1024 female and 639 male participants. Results obtained in the initial development and validation process suggest that the sets of brief activity- and occupational-based RIASEC scales developed in the current study retain acceptable levels of reliability and convergent validity. The development of these brief public domain RIASEC interest measures addresses the copyright and length limitations of current scales and may be useful when conducting integrative research examining the inter-relations between Holland’s types and other individual differences measures.     

Strong Vocational Interest Blank basic interest clusters and occupational satisfaction

A Q-factor analytic technique applied to the Strong Vocational Interest Blank (SVIB) basic interest scales of 156 males yielded three bipolar factors described as conceptual (applied vs theoretical thinking); interpersonal (people vs things); and volitional (autonomy vs structure). From these results the investigators constructed a model for categorizing occupations into corresponding vocational areas: managerial vs academic, social vs physical sciences, and professional vs technical. Each individual's primary interest area and occupational status relative to the six corresponding areas was then determined. The degree of fit between interests and job categorization related significantly to ratings of job satisfaction (p < .001). Those findings are complementary to Holland's notion that interests are expressions of psychological needs and to Lofquist and Dawis' perception of interests and jobs as needs and need reinforcers.     

Convergence of Vocational Interests and Personality: Examples in an Adolescent Gifted Sample

This investigation explored the convergence between vocational interests as measured by the Strong Interest Inventory (Hansen & Campbell, 1985) and two competing personality models: the Big Five as measured by the NEO Personality Inventory-Revised (NEO-PI-R) (Costa & McCrae, 1992) and the Big Three as measured by the Multidimensional Personality Questionnaire (MPQ) (Tellegen, 1982; Tellegen & Waller, in press). The participants were 323 gifted adolescents. The authors predicted that specific NEO-PI-R facet scales and specific MPQ primary scales would add meaningful variance to the prediction of hypothesized Basic Interest Scales (BISs) on the Strong after the variation due to the respective Big Five or Big Three factors was removed. The predictions were largely supported. Moreover, this study provided additional evidence regarding convergence of Holland's Big Six and the Big Five model of personality. This study could serve to prompt a new generation of studies relating vocational interests and personality.     

Convergent and Discriminant Validity of Five Interest Inventories

This study investigated whether interest inventories that purport to measure the same constructs actually yield scores that correspond. The study examined the empirical relation of scores for similarly and same-named scales on five widely used interest inventories: the Campbell Interest and Skills Survey, the Kuder Occupational Interest Survey-Form DD, the Self-Directed Search, the Strong Interest Inventory-Skills Confidence Edition, and the Revised Unisex Edition of the ACT Interest Inventory. Comparisons were made among scores for (a) vocational interests measured by homogeneous, rationally based scales; (b) occupational interests measured by heterogeneous, criterion-based scales; and (c) self-efficacy for RIASEC tasks. The participants consisted of 80 women and 38 men employed as career counseling practitioners and professors. Results from analyses of multitrait-multimethod matrices indicated that similarly and same-named scales correlated moderately and that, with few exceptions, these matched scales demonstrated convergent and discriminant validity. These conclusions were interpreted by distinguishing between the linguistic explication and operational definition of constructs in theories of vocational and occupational interests. The implications of these interpretations were considered for both the science of vocational psychology and the practice of career counseling. Future research should investigate both the profile validity and the interpretive validity of interest inventories that yield scale scores derived from different scaling strategies.     

Utilizing occupational complexity levels in vocational interest assessments: Assessing interests for STEM areas

With an aim to improve vocational interest assessments geared toward the Science, Technology, Engineering, and Mathematics (STEM) areas, we developed a new assessment by incorporating occupational complexity levels. Occupations which correspond to Holland's realistic and investigative themes were identified together with their complexity levels using the information in the Dictionary of Holland Occupational Codes. How the required skills, abilities, and work activities differ in occupations with different complexity levels was identified using the Occupational Information Network. Two studies (N = 691 total) were conducted to assess reliability and validity of a measure of STEM Interest Complexity assessing the level of interests for STEM, which was developed based on the information obtained from these occupation databases. Construct validity was demonstrated with factor analyses and based on associations with traditional interest assessments, cognitive abilities, and theoretically-related constructs. Concurrent criterion-related validity was demonstrated based on associations with attachment to STEM, intentions to persist in and further pursue a STEM field, intentions to choose a complex occupation, college major satisfaction, and STEM-related GPA. Dominance analyses indicated that the relative contribution of the STEM Interest Complexity measure exceeded that of traditional interest assessments in the prediction of criteria. The usefulness of integrating a dimension of level and consulting occupation information databases in developing vocational interest assessments are discussed.     

The inheritance of cognitive interest styles among twins

Through twin studies, research in behavioral genetics has demonstrated significant genetic components in many personality traits. Less research has been done on inheritance of vocational interest preferences, partially because of the lack of a wholistic conceptual model for understanding the relationships among diverse occupational interests. With the development of scales for the Strong Vocational Interest Blank (SVIB) to measure the six cognitive interest styles propounded by Holland, a parsimonious and comprehensive mapping of the occupational world was available and lent itself to the study of measuring inheritance of vocational preferences among twins. Median intraclass correlations for 409 pairs of monozygotic males, tested with the SVIB, was r = .50; for 570 pairs of monozygotic females, r = .55; for 237 pairs of dizygotic males, r = .27; and for 370 pairs of dizygotic females, r= .27.     

The role of personality in the selection of a major: With and without vocational self-efficacy and interests

The purpose of this study is to examine the role of personality traits measured by the Multidimensional Personality Questionnaire (MPQ; [Tellegen, 2000] and [Tellegen and Waller, 2008]) in selecting educational majors. Personality traits were examined alone, and with the combination of Holland’s hexagonal confidence domains, as measured by the general confidence themes (GCT) of the Skills Confidence Inventory (SCI; Betz, Borgen, & Harmon, 2005), and Holland’s interest domains, as measured by the general occupational themes (GOTs) of the 2005 Strong Interest Inventory (SII; Donnay, Morris, Schaubhut, & Thompson, 2005). Personality traits significantly contributed to the discrimination of nine educational major families in a sample of 368 undergraduate decided students. When the set of confidence and interest scales was added to the personality traits, the conservative jack knife hit rate was almost doubled.     

Female Aspirants to the Roman Catholic Priesthood

Parish priests (n=85), nonparish priests (n=55), and women who aspire to, but who are barred from, ordination in the Roman Catholic Church (n=235) participated in an investigation of Holland vocational-personality types, job satisfaction, and psychological dysfunction. Of the three groups, the women's Holland-type code, as determined by the means of the Holland-type scales of the Vocational Preference Inventory, was the most similar to the Holland-type code of clergy member as assigned by the Dictionary of Holland Occupational Codes. Women who were barred from the priesthood reported less job satisfaction than the priests. Significant differences on three clinical scales of the Minnesota Multiphasic Personality Inventory were in the direction of greater psychological dysfunction on the part of the priests.     

INTUITIVE-THEORETICAL SCALES OF CONTENT AND CONTEXT SATISFACTION

Evidence has suggested the usefulness of viewing job satisfaction as composed of content and context aspects. Armstrong attempted to develop intuitive-theoretical scales measuring content and context satisfaction but the scales lacked discriminant validity. The present study attempted the development of content and context scales based on Schletzer's overall job satisfaction instrument. After the criteria of internal consistency and discriminant validity were applied in refining scales, it was found that the inter-correlation between content and context scales after correction for attenuation was 0.06 and 0.05 for two separate samples of professional workers. It was concluded that the data provided some support for the content-context dichotomy. Application of the new scales and the general method for developing scales in industrial and organizational psychology are considered.     

Development and validation of discriminant functions for the Strong Interest Inventory

This study compared the relative accuracy of (a) single Occupational Scale (OS) scores on the Strong Interest Inventory (SII) and (b) multiple-predictor scoring functions for discriminating members of nine occupations from people-in-general. The functions were constructed using discriminant function analysis with 4797 adults drawn from criterion samples for the 1985 SII. The analyses included Basic Interest Scale (BIS) scores only or combinations of OSs and BISs. Two subsequent analyses, one of which was cross-validation using 1302 young adults with little work experience, also were conducted. Results indicated that BIS-only functions yielded hit rates comparable to single OSs, and functions that combined OSs and BISs generally produced slight improvements in accuracy. These findings are potentially relevant for future SII scale development decisions.     

The relation of self-efficacy and interests: a meta-analysis of 60 samples

This study empirically synthesizes and evaluates studies that have examined the relation between vocationally relevant domains of self-efficacy and interests. We conducted a meta-analytic review of 60 empirical independent samples (N=39,154) in which relations between self-efficacy and interests had been examined. Fifty-three of these samples (N=37,829) included parallel measures of the constructs. Relations between parallel measures of Holland’s RIASEC themes, the specific dimensions of art, math, science and math/science combined, and traditionally female and male occupations are also presented. Results demonstrated that self-efficacy and interests are independent constructs that correlate moderately. Differences by sex, measure, and age group are noted. Future directions for research regarding links between self-efficacy and interests are discussed.     

Educational Aspirations: The Contribution of Personality, Self-Efficacy, and Interests

In a sample of 365 college students, the authors examined the incremental role of personality, self-efficacy, and interests in explaining level of educational aspirations. Measures were the Adjective Check List (ACL) (Gough & Heilbrun, 1983), the Skills Confidence Inventory (Betz, Borgen, & Harmon, 1996), and the six General Occupational Themes (GOTs) of the Strong Interest Inventory (Harmon, Hansen, Borgen, & Hammer, 1994). The Big Five personality dimensions were estimated from the ACL using John's (1990) method. The authors predicted that each of these domains would make independent contributions to explaining level of educational aspirations (1= bachelor's, 2= master's, and 3= doctorate). Sequentially, following Lent, Brown, and Hackett's (1994) social cognitive career theory, blocks of the Big Five, six General Conference Themes, and six GOTs were entered into a hierarchical regression predicting educational level. With the addition of each block, R² rose from .10, to .26, to .29 for the total sample; similar incremental predictions were obtained separately for women (.13, .29, and .32) and men (.13, .30, and .37).     

Empirical derivation of SVIB-Holland scales and conversion tables

Significant relationships between the Holland Vocational Preference Inventory (VPI) and the Strong Vocational Interest Blank (SVIB) were again empirically demonstrated in this study, and conversion equations were developed to use standard scores of SVIB scales, rather than items, to produce estimates of VPI scores. Cross validation on a limited population yielded supportive evidence that these conversion equations can provide meaningful VPI estimates from SVIB scale scores. The need for validation across a variety of populations was underscored in order to assess further generalizability of these findings.     

Life history and vocational interests

To obtain some information concerning the antecedents of various forms of vocational interests, scores on the 22 basic interest scales of the Strong Vocational Interest Blank (SVIB) were correlated with 389 life history or autobiographical data items. Items yielding significant correlations were clustered on the basis of item content. The clusters obtained for the business management, science, and adventure scales are presented and discussed. Subsequently, certain general conclusions are drawn concerning the life history correlates of inventoried vocational interests.     

Evidence of construct validity of the interest scales on the Campbell Interest and Skill Survey

This study explored evidence of the construct validity of the interest scales on the Campbell Interest and Skill Survey (CISS; Campbell, Hyne, & Nilsen, 1992) by testing evidence for convergent validity with the Strong Interest Inventory (SII; Hansen & Campbell, 1985). Two hypotheses were formulated. First, matching CISS and SII scales were expected to be more positively correlated compared to non-matching scales. Second, Holland's hexagonal calculus assumption (Holland, 1973) was expected to emerge in the pattern of intercorrelations among CISS and SII scales. These hypotheses were tested using correlational and factor analyses. Results supported the hypotheses and demonstrated evidence of good convergent and construct validity for scores on the CISS interest scales. Implications for the use of the CISS in counseling and for research on Holland's theory are discussed, and directions for future research are presented.     

A longitudinal and multi-method examination of interest–occupation congruence within and across time

Remarkably little research has addressed change and stability in person–environment fit across time. The objective of the current study was to address this gap in the literature by investigating Holland interest–occupation congruence across time for a sample of college alumni (N = 167) that were tracked during the first third of their professional career. Congruence was examined in all its complexity, including a repeated assessment of both occupations and interests, the use of objective (O*NET) and subjective (self-report) environment assessment methods, and adopting sophisticated congruence calculation methods (i.e., Euclidean distance and profile correlation). This resulted in a total of 12 interest–occupation comparisons within and across time that could be related to general and career specific well-being. The results first indicated moderate levels of stability in interests and occupations across the 15-year time interval, yet also with room for change. Congruence analyses indicated significant interest–occupation fit at the beginning of the career and 15 years later, with the magnitude of congruence slightly varying depending on which occupation assessment and which congruence method was used. Profile correlation congruence did not change over time in absolute terms and evidenced relative stability. Euclidean distance indices had little relative stability over time but did manifest some absolute changes in levels of congruence. Finally, job change moderated the association between interest–occupation congruence and life satisfaction in such a way that higher levels of satisfaction were reported only when little job change was present.     

The role of personality and learning experiences in social cognitive career theory

We sought to extend the empirical literature on Social Cognitive Career Theory (SCCT) by testing (a) the posited indirect effect of personality on interests through learning experiences and sociocognitive mechanisms, and (b) hypotheses that self-efficacy percepts and outcome expectations derive from corresponding career-relevant learning experiences. Participants (327 college students) completed a measure of the Big Five personality factors and measures of learning experiences, self-efficacy, outcome expectations, and interests corresponding to each of Holland’s (1997) six RIASEC themes. Results of path analyses indicated that personality’s relation to interests was mediated via learning experiences and sociocognitive mechanisms; however, the extent of that mediation varied considerably across the different personality-interest relations. Findings also indicated strong support, across Holland themes, for SCCT’s hypothesized relations of learning experiences to self-efficacy and outcome expectations; however, for five of the six Holland themes, the relation between learning experiences and outcome expectations was at least partially mediated through self-efficacy.