Position Classification Inventory (PCI): Professional Manual

Gottfredson and Holland identified that while the Dictionary of Holland Occupational Codes (DHOC) provided a way to classify most occupations, it offered no method to directly evaluate any position according to Holland's environmental typology . The DHOC could not determine whether a geologist working in environmental health in Maryland held a similar position to a geologist working at an oil well in Oklahoma . The PCI solves this by providing an empirical method: a job incumbent, supervisor, or analyst rates the demands, rewards, and opportunities of a specific position, generating a RIASEC profile of that environment .

The PCI is an 84-item inventory that can be completed in approximately 10 minutes by a worker, supervisor, or job analyst . Respondents describe the demands, skills, and personal styles required in a position by rating each item on a 3-point scale . The inventory yields a RIASEC profile of the job, which can then be compared with an individual's SDS results to assess person-environment congruence. Scoring takes about two minutes, and the resulting profile can be plotted on a grid to obtain a Holland code for the position .

The alpha (internal consistency reliability) coefficients for the PCI scales range from .74 to .87, with a median of .79 in the initial normative sample . For supervisor ratings, the coefficients range from .71 to .91, with a median of .83 . However, Gottfredson and Holland themselves found that the Enterprising scale showed the least reliability and discriminative validity . A Spanish adaptation study confirmed this pattern, finding that the Enterprising scale had the lowest reliability coefficient (0.65) in their sample .

Martínez Vicente and Valls Fernández (2003) translated the PCI into Spanish and administered it to 525 subjects across 78 occupations. Reliability indices ranged from 0.65 to 0.85, but the Investigative, Social, Enterprising, and Conventional scales all fell below 0.80 . Item analysis detected that 42.3% of items did not meet the established criterion of correlating higher with their own scale than with others . The Enterprising scale had 11 problematic items (84.6% of the scale), and the Conventional scale had 9 (69.2%) . The authors concluded that refinement was needed before Spanish application.

Miller and Bass (2003) used the PCI to examine job classifications in a paper container manufacturing plant, addressing the fact that most Holland research had involved college-educated workers . They found relatively high congruence between the DHOC's classification and workers' PCI classifications for both men (Iachan Index 24.1) and women (21.5), with no gender differences . The Realistic type ranked first on 19 of 20 PCI protocols . The authors concluded that the PCI shows promise as a method for classifying working-class occupations according to Holland's theory .

The SDS assesses the person; the PCI assesses the environment. This parallel construction allows counselors to obtain both sides of the congruence equation independently . Rather than relying on occupational codes from a dictionary (which may not match a specific position's actual demands), the PCI measures what a particular job actually requires and offers. This is particularly valuable when a position's title does not capture its true RIASEC profile, or when assessing whether two positions with the same title are genuinely equivalent environments . The PCI enables a more precise, situation-specific assessment of person-environment fit.