Mary-Catherine McClain, Robert C. Reardon

In this article, the authors analyze ways of categorizing civilian occupations and employment data collected by the U.S. Census Bureau over 6 decades (1960–2010) with respect to six kinds of work (Holland’s RIASEC classification), occupational titles used, employment and income. O*NET provided data for the 2010 census regarding employment and income. The authors discuss the distribution of employment changes over time and the examination of findings in relation to science, technology, engineering and mathematics fields. The article concludes with practical implications for counseling and guidance practice.

Keywords: Holland, RIASEC, census, employment, occupations, income


Holland’s (1997) RIASEC theory is generally recognized as one of the most important and influential in the field of counseling and career development. Foutch, McHugh, Bertoch, and Reardon (2014) sought to verify such an observation by using bibliographic research tools and identified all publications based on this theory from 1953–2011. They found over 1,970 reference citations to Holland’s theory and applications, and categorized them in terms of practice, specific populations (e.g., K–12), instruments, diverse populations and theory. These citations appeared in 275 publications (e.g., books, journals, periodicals, reports) produced in varied professional fields and disciplines worldwide.


Many counselors know relatively more about Holland’s RIASEC personality typology than corresponding environmental models (Reardon & Lenz, 1998). From the outset, Holland believed that the environmental aspects of the typology needed further examination (Weinrach, 1980). Occupations, fields of study or academic disciplines, organizations, leisure activities, and jobs (positions) are aspects of the environment included in the theory. In this article, we address the interaction between RIASEC theory and the environment by examining 2010 census data and updating prior studies of occupational employment in 1960, 1970, 1980, 1990 and 2000 in relation to RIASEC codes and Holland’s theory (Reardon, Bullock, & Meyer, 2007).


Various people contemplating career decisions can benefit from understanding the scope and nature of the labor force and employment from this psychological, counseling-based point of view. Moreover, given characteristics of the contemporary U.S. economy, it is important to know how the distribution of jobs is changing over time. For example, the distribution of jobs across the RIASEC categories has changed from 1960–2010 in some ways, but not in others. An analysis of occupational employment, then, can be beneficial to counselors and career services providers assisting those who are unemployed, displaced or exploring the labor force. This work is important for both theoretical and practical reasons. For example, the number of annual job openings is strongly related to the number of people currently working in an occupation, so knowing the number employed is of practical importance in job hunting because of the need to replace workers.


Authors of recent literature have identified concerns about the use of outmoded concepts such as occupation in career/life counseling at a time of unprecedented socioeconomic change in the global economy. For example, Savickas et al. (2009) noted that new social arrangements for work and the digital revolution have led to unstable occupations and frequent job transitions for individuals: “Today, occupational prospects seem far less definable and predictable, with job transitions more frequent and difficult” (Savickas et al., 2009, p. 240). Sampson and Reardon (2011) summarized these ideas: “Occupations have changed in fundamental ways as technology and globalization have reshaped the workplace. Occupations have become fluid and organizations are evolving rapidly, adapting their workforce to respond to a rapidly evolving marketplace” (p. 41). We agree that some occupations are changing but conclude that the concept of an occupation remains common and useful in the social sciences as a way of categorizing work activities and employment.


In contrast to this view, Murray (2012) suggested that the workplace has not transformed for the 82% of American workers in occupations other than managerial professional positions. Teachers, police, plumbing contractors, insurance agents and carpenters have the same duties and routines that these occupations have always required, although some of the work tasks may have been affected by technology. Sampson and Reardon (2011) noted that the perception of massive occupational change has been exacerbated by inaccuracies in media presentations and the failure to use career theory to examine occupational changes.


In the present article, we examine occupational information using Holland’s (1997) RIASEC theory. This theory rests on four basic assumptions: (a) individuals can be categorized into Realistic (R), Investigative (I), Artistic (A), Social (S), Enterprising (E) and Conventional (C) types; (b) environments (i.e., occupations) also can be categorized into these same six types; (c) individuals tend to choose environments that fit their personality types; and (d) behavior is determined by the fit between an individual’s personality and environment. Examination of the occupational titles used to describe current work in the United States, including information about employment and income, can increase understanding of the workplace from this theoretical perspective.


Holland’s (1997) typological theory specifies a theoretical connection between vocational personalities and work environments that makes it possible to use the same RIASEC classification system for both persons and occupations. Many inventories and assessment tools also use the typology to enable individuals to categorize their interests and personal characteristics in terms of the six types and combinations of the types. These six types are briefly defined as follows:


  1. Realistic (R) types are found in occupations such as auto mechanic, surveyor, electrician and farmer. The R type usually has mechanical and athletic abilities, likes to work outdoors and with tools and machines, and might be described as conforming, hardheaded, honest, humble, materialistic, practical and thrifty.
  2. Investigative (I) types like occupations such as a biologist, chemist, geologist, anthropologist and medical technician. The I type usually has math and science abilities, and likes to work alone and to solve problems. The I type might be described as analytical, critical, curious, independent, intellectual, pessimistic and rational.
  3. Artistic (A) types are found in occupations such as musician, dancer, interior decorator, actor and writer. The A type usually has artistic skills, enjoys creating original work and has a good imagination. The A type may be described as disorderly, emotional, idealistic, imaginative, impulsive, independent, introspective and original.
  4. Social (S) types like occupations such as teacher, speech therapist, counselor, clinical psychologist and nurse. The S type generally likes to help, teach and counsel people, and may be described as friendly, generous, helpful, idealistic, kind, responsible, tactful, understanding and warm.
  5. Enterprising (E) types like occupations such as buyer, sports promoter, business executive, salesperson, supervisor and manager. The E type usually has leadership and public speaking abilities, is interested in money and politics, and likes to influence people. The E type is described as acquisitive, ambitious, domineering, extroverted, optimistic, self-confident and sociable.
  6. Conventional (C) types are found in occupations such as bookkeeper, financial analyst, banker and secretary. The C type has clerical and math abilities, likes to work indoors and to organize things. The C type is described as conforming, efficient, obedient, orderly, persistent, practical and unimaginative.


The six RIASEC types are optimally represented by a circular order, also commonly referred to as the hexagonal model. Holland’s (1997) structure of the six types as a hexagon is one of the most well-replicated findings in the history of vocational psychology (Rounds, 1995). The six domains are arranged according to their relative similarity in a hexagonal formation of R-I-A-S-E-C. For example, according to Holland’s theory, the Social and Enterprising types appear in adjacent positions on the hexagon because they are alike; in contrast, the Social and Realistic types are dissimilar and appear in opposite positions from one another on the hexagon.


Prior Studies


In the early 1970s, researchers began to examine the U.S. labor market using the RIASEC classification system (Reardon et al., 2007), and the present study is a continuation of that line of research. Using data provided by the decennial census in 1960, 1970 and 1980, researchers (G. D. Gottfredson & Daiger, 1977; G. D. Gottfredson & Holland, 1996; G. D. Gottfredson, Holland, & Gottfredson, 1975; L. S. Gottfredson, 1978; L. S. Gottfredson, 1980; L. S. Gottfredson & Brown, 1978) analyzed U.S. employment patterns using Holland’s theory. These studies examined a number of variables with respect to the Holland RIASEC classification, including the percentages of men and women working in hundreds of occupations, salaries earned during the preceding year by incumbents, educational and training levels associated with occupations, occupational prestige, and the education levels or cognitive complexity ratings for occupations. These studies provided practitioners and scholars with more theory-based, detailed information about work environments and the characteristics of workers.


After a 15-year hiatus in research on census employment and Holland codes, Reardon, Vernick, and Reed (2004) analyzed the 1990 census data in relation to data from 1960, 1970 and 1980. They considered the variables of gender, income and cognitive complexity and reported stability in the census data for occupational titles and six kinds of work from 1960–1990. For example, the Realistic area included many more named occupations in the census than the other five areas, averaging between 46% and 50% of all named occupations over the 40-year period.


Reardon et al. (2004) found that while employment declined by 18% in the Realistic area relative to other Holland types, it remained the largest area of employment and actually increased in real numbers through 1990. Only 1% of employment was in the Artistic area. Reardon et al. (2004) also reported marked differences in employment between men and women across the six areas from 1960–1990. Reardon et al. (2004) further examined income and gender by six kinds of work and found that the average income profile ranging from highest to lowest was IESARC. The discrepancy across the six areas was very large, with the average Investigative income being two times the average Conventional income.


In a later study, Reardon et al. (2007) examined trends in labor market characteristics using census data from 1960–2000. They found stability in occupational constructs for six kinds of work from 1960–2000; for instance, the Realistic area included many more named occupations in the census than the other five areas, ranging between 43% and 50% of all occupations included over the five census periods. Reardon et al. (2007) reported that although employment in the Realistic area declined by 25% from 1960–2000, this area remained the largest area of employment and actually increased in real numbers from 1960–2000. As before, only 1% of employment was in the Artistic area. Finally, Reardon et al. (2007) examined income and gender by kinds of work and found that the average income profile for six kinds of work ranging from highest to lowest was IESARC in 1990 and ISEARC in 2000. The discrepancy across the six areas was very large, with the average Investigative income about twice as large as the average Conventional income.


In summary, the data included in these studies (Reardon et al., 2007; Reardon et al., 2004) were unique in several ways and have special implications for counselors. First, as an independent branch of the federal government, the U.S. Census Bureau reported actual numbers of people working in different occupations based on an accounting of persons in households. Second, these data provided a retrospective look at the labor markets, and by examining them over time it was possible to view changes in the economic lives of persons in the United States. Third, the occupational titles included in the census have remained constant over the years, reinforcing the use of the occupational schema in matching persons and environments. Fourth, these studies were conducted by researchers in the counseling field rather than economists or sociologists, which helps counselors use occupational data organized by Holland codes to illustrate and explain where jobs exist in relation to their clients’ interests. For example, a client may have a strong interest in Artistic occupations, and census data may help a counselor explain the relatively small number of persons working in Artistic fields.


The Present Study


We examined the employment trends reported in earlier research and added a new analysis based on the 2010 census and O*NET data. Research questions included the following:


  1. What were the numbers of occupational titles reported in the census from 1960–2010 relative to the six areas of work?
  2. What were the numbers and percentages of occupational employment in 1960, 1970, 1980, 1990, 2000 and 2010 in relation to six kinds of work?
  3. What were the mean incomes for six different kinds of work in 1990, 2000 and 2010?




Procedures and Research Tools

Varied procedures have been used to collect occupational data for the decennial census over the past 6 decades.


1960, 1970, 1980 census. In the 1960 census, the sampling unit was the housing unit, or the person in the case of group housing. This method provided information about 297 detailed occupational categories. L. S. Gottfredson and Brown (1978) described the methods they used to derive Holland codes for the 1960 census data using 1970 census data as a point of reference. In the 1970 census, the sampling unit again was the housing unit, and 440 detailed occupational titles were included in these data, 143 more than in 1960. As with the 1960 census, the data included only employed persons and excluded members of the armed forces. G. D. Gottfredson, Holland, and Gottfredson (1975) analyzed data from the 1970 census involving 424 occupations, and excluded men (5.6%) and women (6.6%) not classified according to one of the detailed occupations. Information about the 1980 census was taken primarily from G. D. Gottfredson and Holland (1989) and G. D. Gottfredson (1984). The 1980 analysis was based on 503 selected occupations.


1990 census. Comprehensive information about the 1990 census was provided by the U.S. Census Bureau (1992a, 1992b), and was based on 500 selected occupations. G. D. Gottfredson and Holland (1996) indicated that this classification was most closely related to the Standard Occupational Classification (SOC; U.S. Department of Commerce, 1980). The U.S. population count in 1990 was 283,928,233 (U.S. Census Bureau, 1992b). Four new categories of work were added to the 1990 census while six from the 1980 census were eliminated.


2000 census. The 2000 census counted 281,421,906 people in the 50 states and the District of Columbia. As in the past, short and long forms were used with about 17% (1 in 6 households) receiving the latter (U.S. Census Bureau, 2002). The 2000 census included 471 occupations classified using the SOC (U.S. Department of Labor, 2000).


2010 census. The 2010 census counted 308,745,538 people in the 50 states and the District of Columbia. This census included 539 occupations, including those with “all other” titles representing occupations with a wide range of characteristics not fitting into one of the O*NET detailed occupations. However, as in prior studies, the focus was on the detailed occupations in the 2010 census (N = 494) and excluded military-based occupations.


The information collected in the 2010 census was based on the short form rather than the long form, which means that demographic information about gender, salary and age was not collected relative to occupations. Lowe (2010) noted that the introduction of the American Community Survey by the U.S. Census Bureau provided the most sweeping change in census data collection in 60 years. The American Community Survey is a nationwide, continuous survey designed to provide reliable and timely demographic housing, social and economic data every year, in contrast to the long form, which provided data only at the beginning of each decade.


After locating the 2010 census data from the U.S. Census Bureau with lists of occupations categorized with census and SOC codes, we organized the information into a spreadsheet using the following headings: Occupation 2010 category description (e.g., management occupations), Occupation (e.g., chief executive), 2010 Census Code (e.g., 0010) and 2010 SOC Code (e.g., 11-1011). Additional columns were created to incorporate Holland code information for 2010 employment data and mean annual wages. The SOC (U.S. Department of Labor, 2010) was used to collect employment and salary information from the O*NET system ( O*NET is a comprehensive database that provides information on 780 occupations, worker skills and job training requirements. O*NET is sponsored by the U.S. Department of Labor’s Employment and Training Administration. The Self-Directed Search Occupations Finder—Revised Edition (OF; Holland & PAR Staff, 2010) and the Dictionary of Holland Occupational Codes (DHOC; G. D. Gottfredson & Holland, 1996) also were used to obtain the first-letter Holland code for each specific occupation. Employment data and mean annual wages for census occupations were found in O*NET.


A Note about Data Analysis

Previous studies of employment using census data and Holland codes have reported frequency and percentage distributions, and this study continued that approach. As earlier researchers have noted (G. D. Gottfredson & Daiger, 1977), the sample sizes are so large that the magnitude of observed differences is more important than statistical differences. Rounded numbers are used in this report to the nearest percent or thousand in order to avoid communicating a misplaced sense of precision in the findings.




Occupational Titles in the Census for Six Kinds of Work, 1960–2010

For the first question, we examined the number of occupational titles used in the census and O*NET, and categorized these in relation to the six areas of work. Occupational titles provide schemas for career exploration using Holland’s (1997) RIASEC codes—tools for the exploration and examination of occupational information. As in previous studies (Reardon et al., 2007), the Realistic area included many more named occupations in the census than the other five areas (see Table 1, updated with 2010 data). For example, the 2010 census specified 211 occupations in the Realistic area and 283 occupations in the other five areas combined. Only 19 occupations were identified in the Artistic area. Overall, occupations in the Enterprising area increased from 27 in 1960 to 88 in 2010. Finally, 282 occupations were included in the 1960 analysis, which increased to 465 in 1970, 502 in 1980 and 500 in 1990, dropped to 434 in 2000, and increased again to 494 in 2010.


Table 1 also shows that occupational titles were not equally distributed across the six areas of work over the past six decades and have changed very little during this period. For example, the Realistic area consistently has the most occupational titles and the Artistic area the fewest. Figure 1 shows the average percentages of occupational titles in the census across six decades, as follows: Realistic 46%, Investigative 12%, Artistic 3%, Social 12%, Enterprising 18% and Conventional 9%. This distribution is similar to what was found in 2010: Realistic 43%, Investigative 11%, Artistic 4%, Social 13%, Enterprising 18% and Conventional 11%. Figure 1 shows in graphic form that the schemas used to describe work activities in the U.S. economy have remained relatively stable over 6 decades.


Employment in Six Kinds of Work, 1960–2010

In analyzing U.S. employment data over 6 decades, we focused on the detailed occupations as in previous census studies (Reardon et al., 2007). Table 2 indicates that the total estimated employment increased over the 6 decades from 64.1 million in 1960 to 119.8 million in 2010. Table 2 and Figure 2 reveal that the percentage of Realistic employment declined 28% from 1960–2010, an average of about 4.7% for each decade. However, and in spite of this decline, the Realistic area showed that 31.9 million persons were employed in 2010, and the Realistic area had the highest level of employment across the six RIASEC areas in each census period. The Artistic area had the fewest number employed in 2010 with 2.0 million. Table 2 and Figure 2 show that the percentage of employment in the Social area increased from 9% in 1960 to 24% in 2010, or 5.6 million to 29.6 million persons. During the same period, employment in the Investigative area increased from 3% in 1960 to 10% in 2010, or 2.0 million to 11.5 million persons. Employment in the other four areas remained more stable. Figure 2 graphically shows that the RIASEC employment profile for highest to lowest areas was RSECIA in 1960 compared to RECSIA in 2010. The Realistic, Investigative, and Artistic areas maintained their positions over this time period.


Table 2


Number and Percentage of Persons Employed in Six Kinds of Work, 1960–2010

Census Year (Detailed Occupations)

Kind of Work 1960a 1970a 1980 1990 2000 2010























































































Note. Employment numbers are in millions rounded to the nearest thousand.

aUsed by permission of Academic Press Inc., Journal of Vocational Behavior, 10, p. 131. Copyright 1977 Academic Press Inc.



Income and Kinds of Work, 1990–2010

For the third question, we focused on mean income levels for persons employed in six kinds of work in 1990, 2000 and 2010. Inspection of Figure 3 shows the results of this analysis. These data reveal the continued discrepancy with regard to income among the Holland types across the three most recent census periods. The RIASEC profiles for highest to lowest income were IESARC, ISEARC and IEASRC in 1990, 2000 and 2010, respectively. The Investigative area consistently showed the highest income levels over the 3 decades, while the Conventional and Realistic areas tended to show the lowest. The average income over the 3 decades for the Investigative area was $54,587, compared to Conventional, $28,047 and Realistic, $27,981. Data in Figure 3 continue to show wide variations in income levels among the six RIASEC groups. For example, in 2010 the income in the Investigative area was almost double that of the Conventional area.




The principal findings of this study are examined in terms of the three questions that guided the research, followed by a discussion of the study’s limitations and implications for counseling practice.


Occupational Titles by RIASEC Code

Information about jobs and employment used in counseling may be affected by the uneven distribution of occupational titles describing work across RIASEC areas. Over 60% of the titles used in 2010 were in the Realistic and Enterprising areas, and this distribution has been consistent over the past 6 decades. It is noteworthy that the percentages of occupational titles in the Investigative and Conventional areas in 2010 were the same, but the income reported across the six areas was the most discrepant between these two areas. Labor market information across the six areas is not always equivalent.


G. D. Gottfredson and Holland (1989) reported that the Dictionary of Occupational Titles also showed variations in the distribution of RIASEC codes for occupational titles. They were interested in the number of times each RIASEC letter appeared somewhere in the three-letter code for each occupation in the Dictionary of Occupational Titles and reported the following: Realistic, 10,708 times; Investigative, 2,551; Artistic, 570; Social, 6,606; Enterprising, 10,405; and Conventional, 5,999. These data reveal that upon examining the world of work from a RIASEC perspective, counselors can obtain a theory-based view of work environments that is not equitable across the six areas. Counselors can use RIASEC codes to inform clients about work and to increase their understanding of occupations and employment.


Information about jobs and employing organizations changes more frequently than information about occupations (e.g., typical work duties, training requirements, working conditions; Reardon, Lenz, Sampson, & Peterson, 2012). Perhaps lessons from the field of general semantics (Johnson, 1946) can be useful here. For example, the word chair can communicate information about the arrangement of furniture in a room, but this word does not communicate everything known about chairs, which in reality may take many different forms and be built of varied kinds of materials. The same is true for occupational terms. There are many different carpenters working in varied job positions and for varied employers, but the term carpenter still has meaning in communications because it is generally understood that not all carpenters are the same.


Over the 6 decades of this analysis, the number of census occupations in each RIASEC area has been relatively static. This stability indicates that there is considerable permanence in the array of the named occupations in the census reports about the workforce. This finding is contrary to the observations by Savickas (2012) and Savickas et al. (2009) regarding instability of the concept of an occupation in the contemporary global economy.


Employment in Six Areas of Work

The findings of this study report both the numbers of persons employed and the percentages of employment across RIASEC areas for six census periods. We believe that information about employment in the past can be instructive for future career planning. Table 2 reports the numeric and percentage changes in employment over 6 decades. The table shows the actual number of persons employed according to the decennial censuses over the 60-year period. This table and Figure 2 show the percentage change­s—the distribution of the workforce within the RIASEC categories. Occupations that employ the largest numbers of people are in the Realistic, Social and Enterprising areas, with less employment in the Investigative and Artistic areas. The latter two areas report both the fewest numbers employed and the smallest percentages of employment across the six RIASEC areas.


The current emphasis on preparation for careers in science, technology, engineering and mathematics (STEM) fields involves occupations that do not employ large numbers of people. These occupations, often found in the Investigative and Artistic areas, employed relatively small numbers of people in 2010 compared to the other four areas: 12% versus 88%. The STEM fields are not big-growth occupational areas that employ many hundreds of thousands or millions of people (e.g., nurses, retail salespersons, office clerks, teachers). However, the STEM fields are generally characterized by fast growth that involves a few thousand or more persons (e.g., biomedical engineers, veterinary technicians, glaziers, physical therapists). Persons in these occupations typically have higher salaries and better employment opportunities (Horrigan, 2003–2004).


The findings of the present study indicate that most people are employed in Realistic, Enterprising and Conventional (REC) occupations. Public attention to employment and career preparation often is directed at occupations with code combinations in the Investigative, Artistic and Social (IAS) areas because the percentage rate of employment growth is often greater there than in the REC areas (Reardon et al., 2012). The IAS areas provide higher levels of prestige and income, but employ fewer people (Reardon et al., 2004). One must remember that these are projected new jobs, which seem to capture more public attention and interest than the census data regarding actual employment.


A large number of jobs actually involve replacement of older workers, perhaps as much as one-third of employment (Mittelhauser, 1998). The U.S. Bureau of Labor Statistics (BLS; 2012) used data from the Current Population Survey and found that the replacements provide many more job openings in most occupations than straight employment growth does.


While the census data provide information about past employment that can inform career planning, the U.S. BLS provides additional labor market forecast information based on occupational projections. Lockard and Wolf (2012) identified the 20 occupations expected to have the most job openings each year through 2020 (big-growth occupations). Four of these occupations—registered nurses, retail salespeople, home health aides and personal care aides—will add more than half a million jobs each through 2020. These occupations are not new, different or unique, and they are unrelated to STEM fields. Reardon et al. (2012) noted that the Holland summary code order for these 20 big-growth occupations was SREICA. In the current study, the profile for employment in the 2010 census was RECSIA. It is not surprising that the Realistic area is prominent in both of these projections, because according to the census, it is the area of largest employment in the economy.


Given the overall increase in actual employment from 64.1 million in 1960 to 119.8 million in 2010, there has been a corresponding increase in employment across the six areas of work. For example, the number of persons employed in the Investigative area has grown from over 1.9 million in 1960 to 11.5 million in 2010, and in the Social area from 5.6 million in 1960 to 29.6 million in 2010. Employment growth has been less dramatic in the Artistic, Enterprising and Conventional areas, and growth has declined slightly in the Realistic area from 35.0 million in 1960 to 31.9 million in 2010.


In addition, the percentages of the U.S. population employed in the six areas of work also have changed from 1960–2010, but in a less dramatic way (see Figure 2). For example, the employment percent profile from highest to lowest employment in 1960 was RECSIA, and in 2010 it was RSECIA, with only the ECS areas alternating in order. However, the percentage difference between the Realistic and Artistic areas was greater in 1960 (54%) than in 2010 (25%). This may be evidence of a decline in manufacturing.


Income Across Six Areas of Work

Our findings indicate that income is not equitable across the six RIASEC areas, with the Investigative area consistently having the highest income and the Realistic and Conventional areas the lowest. Research using census data by Huang and Pearce (2013), Reardon et al. (2004), and Reardon et al. (2007) revealed similar findings. We find that although the RIASEC schema is familiar to counselors using the Self-Directed Search, the Strong Interest Inventory and many other career assessments, the idea of using this schema to analyze occupational information is more novel. For example, thinking of income levels in terms of the RIASEC schema means using an order of IEASRC per the 2010 census data when discussing occupational information with clients.


Reardon et al. (2007) reported that examining levels of cognitive complexity associated with occupations may provide an explanation for the income disparity among the six RIASEC areas. G. D. Gottfredson and Holland (1996) created the Complexity Rating (Cx) to estimate the cognitive skill and ability associated with an occupation. In developing the Cx, the authors wanted to make greater use of job analysis ratings obtained by the U.S. BLS and also create a single measure of cognitive or substantive complexity associated with an occupation. They noted that cognitive complexity of work demands (G. D. Gottfredson & Holland, 1996) might be an appropriate term for the Cx. A Cx rating of 65 or higher could be associated with an occupation requiring a college degree and possibly postgraduate work and on-the-job training of 4–10 years, while a Cx level of 50 might characterize an occupation requiring a high school diploma and a year or more of on-the-job training. Reardon et al. (2007) found that Cx levels were highest in the Investigative and Artistic areas and that the Conventional area was associated with the lowest ratings. They found that employment in the Investigative area occurred only at the highest two levels of Cx (i.e., baccalaureate or higher) while the other four areas—Realistic, Social, Enterprising and Conventional—showed employment at all six levels of Cx.


Huang and Pearce (2013) reported that higher annual incomes in 2010 were found in occupations associated with greater Investigative and Enterprising traits. In addition, they found that the differentiation of an occupational interest profile positively predicted median annual income and moderated the effect across each of the six RIASEC areas. In other words, the more the occupation was characterized by a single, robust RIASEC code letter, the greater the income level for the occupation.


Reardon et al. (2007) examined income by kinds of work and found that the average income profile for six kinds of work ranging from highest to lowest was IESARC. In the current study, the income profile was almost identical—IEASRC. These findings are very similar to those reported by Huang and Pearce (2013). Given that the Investigative area of work requires more education and training than the other five areas, these findings from census data provide evidence that education pays. Reardon et al. (2012) reported that the unemployment rate is clearly related to educational attainment. Those with more education are less frequently unemployed and have higher weekly earnings—more education is connected to more income.




As with earlier studies (Reardon et al., 2007; Reardon et al., 2004), several limitations in the present study should be noted. First, the occupational titles included in the census have changed only slightly over the years. The U.S. BLS conducts extensive research to determine whether a new occupation should be added to its list of detailed occupations. A new occupation is one that includes duties not previously identified, one that has been recognized in small numbers and continues to grow (e.g., now has its own professional association or trade group), or one that is evolving and whose tasks have changed significantly. These new occupations arise from technological advances, new laws or regulations, or changing demographics. However, we believe that this issue has minimal impact on the findings of the present study because changes in occupational codes are unlikely to affect the first letter of a code. First-letter codes of occupations are much more stable over time and across industries than second or third letters.


A second limitation of this study is related to the classification of hundreds of thousands of jobs into 350–500 occupational categories, which requires considerable judgment and skill by occupational analysts. These specialists base their judgments on the application of classification criteria, and there is the possibility of error in the use of this system of analysis. Third, we used the first letter in each Holland code in our analysis in order to simplify reporting. While this decision reduced some of the precision inherent in the Holland classification when three-letter codes are used, it increased the accuracy of occupational classification.


Fourth, our analysis was based on a sampling procedure used by the U.S. Census Bureau over 6 decades, and we generalized from this sample to the entire U.S. population. We assumed that the sampling procedure used by the U.S. Census Bureau was appropriate for this study. Fifth, the method for calculating the income levels reported in this study differed across the 3 decades, and comparisons should be made with caution. We used mean levels rather than median levels, and information about the skew of the distribution is not provided in this study. For example, Lowe (2010) noted that while the American Community Survey data are more current, they are not as precise (margins of error are generally higher) as data obtained in the long form used by the U.S. Census Bureau previously. Finally, it is possible that occupations may be shifting within or among industry groups, which would mask some of the findings regarding income reported in the present analysis.


Implications for Counseling Practice


Limitations notwithstanding, the results of this analysis of six kinds of work and employment over 6 decades have implications for counselors. Holland (1997) noted several rules to use in interpreting the Self-Directed Search interest inventory, such as the Rule of Asymmetrical Distribution of Types and Subtypes. This rule reminds both counselor and client that the distribution of types across the six RIASEC areas is very uneven and unequal; moreover, the distribution of jobs across the six types is not symmetrical or equal. Codes associated with small employment numbers may have fewer positions and fewer openings. The research in the present article underscores the validity of this rule. In each census period, the Artistic area was the smallest area of employment at 1% or 2%. At the other extreme, the Realistic area was the largest area of employment, ranging from 55% in 1960 to 27% in 2010. Career counselors should be cautious in advising workers to look for employment outside the Realistic area, because it has been the largest area of employment for the past 6 decades, with ongoing replacement needs (Reardon et al., 2007).


We can add that even the numbers of named census occupations are extremely uneven across six kinds of work. For example, the schema based on RIASEC types used in 2010 to examine occupations was heavily skewed in the direction of the Realistic area (N = 211), with very few occupational titles associated with the Artistic area (N = 19). We surmise that these findings reveal little evidence of instability and change in the use of the occupational schema by the U.S. Census Bureau, at least from a RIASEC perspective.


Some of these findings may be interpreted in different ways. For example, the Realistic area employed the most persons in 2010, but employment in that area has dropped 28% over the 6 decades. The loss of jobs in the Realistic area is greater than the changes in any other area, decreasing from 42.7 million in 1990 to 31.8 million in 2010. The Investigative area almost tripled in employment from 1960–2010, from 3% to 10%, but fewer than 10% of total U.S. jobs are in the Investigative area (11.5 million). These findings seem related to the issue of big-growth and fast-growth jobs described by Horrigan (2003–2004), in which very few occupations appear at the top of both lists. For example, only home health aides and personal care aides are included in both the top 20 big-growth and fast-growth employment areas. This information underscores the importance of understanding demography and an aging population in using labor market information. The information used in career guidance programs often touts the rapid growth in information and technology jobs; however, this information must be balanced with the understanding that only 8% of U.S. employment is in the Investigative area.


The findings of the current study can update and enhance a counselor’s view of labor market information based on Holland’s career theory. We suggest that a RIASEC perspective on jobs in the labor market indicates that things are not really changing as much as others sometimes discuss. U.S. census data compiled over 6 decades (1960–2010) can inform counseling practice and career interventions for students and others exploring occupational changes. These findings can assist counselors and their clients in better matching personal characteristics with occupational and work environments.



Conflict of Interest and Funding Disclosure

The authors reported no conflict of

interest or funding contributions for

the development of this manuscript.




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Mary-Catherine McClain is a postdoctoral fellow at the University of Georgia. Robert C. Reardon is a professor emeritus at Florida State University. Correspondence can be addressed to Robert C. Reardon, FSU Career Center, PO Box 3064162, 100 South Woodward Avenue, Tallahassee, FL 32306-4162,