How many personality types did Holland categorize?

Holland categorized personality types into six distinct categories, which form the basis of his theory known as the Holland Code or RIASEC. These six types are Realistic, Investigative, Artistic, Social, Enterprising, and Conventional. Each type represents a different set of preferences and characteristics that individuals may exhibit. The theory suggests that people are more likely to be fulfilled and successful in careers that align with their primary personality type, leading to better job satisfaction and performance.

With this understanding, the classification into six types underlines Holland's belief in the importance of matching personality with job environments, which is a fundamental concept in career development and counseling. The other options do not accurately represent Holland's framework, as the number of personality types is firmly established at six.