Understanding the Theory: Holland's Codes
In the 1970s John Holland developed a popular theory of interest development based around these six personality types:
1. Realistic (R)
These are people who like well-ordered activities, or enjoy working with objects, tools, and machines.
See themselves as mechanically or athletically talented, but may not be good with people.
Value concrete and tangible things like – money, power, and status.
Avoid "social" activities, those that need interaction with other people.
Hard-headed, inflexible, persistent, materialistic, practical, and genuine.
2. Investigative (I)
Investigative people like activities that involve creative investigation of the world or nature.
See themselves as highly intelligent, but often lack leadership skills.
Value scientific endeavors.
Avoid activities that seem mundane, commercial or "enterprising".
Analytical, curious, pessimistic, intellectual, precise, and reserved.https://www.mindtools.com/pages/article/newCDV_98.htm