The Yatabe-Guilford Personality Inventory (YG Personality Test) is a personality test developed and standardized for Japanese populations by Japanese psychologist Tatsuro Yatabe,
based on the theory of American psychologist J.P. Guilford.
It is widely used in schools, companies, medical institutions, and correctional facilities, and serves as a representative psychological test to understand "behavioral tendencies" and "personality traits."
The first edition was published in 1959 and it remains in use across educational, industrial, medical, and correctional fields today.
① Definition: What is the YG Personality Test?
The YG Personality Test is a questionnaire-based psychological assessment that measures individual personality tendencies across 12 scales,
constructing an overall personality profile.
It was originally developed by adapting Guilford’s factor-analytic personality structure model into Japanese language and culture.
【The 12 Scales】
- D: Depression (Tendency to mood lowering)
- C: Regression (Tendency toward dependency or immature responses)
- I: Inferiority (Low self-evaluation)
- N: Neuroticism (Emotional instability)
- O: Lack of Objectivity (Bias toward subjective judgment)
- Co: Lack of Cooperativeness (Tendency for interpersonal friction)
- A: Activity (Behavioral liveliness)
- S: Carefreeness (Reverse scale of nervousness)
- G: Thoughtfulness (Intellect and introspective tendency)
- T: Dominance (Leadership tendency)
- R: Social Extraversion (Sociability and assertiveness)
- Q: Personality Harmony (Personality stability and calmness)
Based on these scores, 9 personality patterns (e.g., “Stable type,” “Inferiority type,” “Rebellious type”) are classified, visualizing specific personality tendencies and stress profiles.
② Background: Why is the YG Personality Test valued?
In postwar Japan, the need to objectively grasp "behavioral traits" and "internal tendencies" in educational and corporate personnel selection and guidance grew,
leading to the widespread adoption of the YG test due to its ability to provide a large amount of information in a relatively short time.
The test is based on Guilford’s personality factor theory, which demonstrated through factor analysis that human personality consists of multiple independent tendencies.
Yatabe adapted and standardized this model for the Japanese cultural context.
Notably, it emphasizes standard personality type classification, distinctly different from continuous models like the Big Five.
This design reflects the intent for immediate practical use in Japanese educational and corporate settings at the time.
Moreover, compared to Western psychological tests like MMPI, YG has a history of trusted culturally adapted item construction for Japanese populations.
③ Features (Strengths): Advantages of the YG Personality Test
- Quick to administer: About 120 questions take approximately 20 minutes, suitable for group testing and mass administration.
- Multifaceted scale composition: Analyzes emotional, interpersonal, cognitive, and behavioral aspects.
- Practical profile classification: Intuitive use with 9 personality types such as “Stable type” and “Neurotic type.”
- Historical accumulation and proven results: Long-term usage has accumulated rich practical knowledge.
④ Limitations and Issues: Problems with the YG Personality Test
The YG test has been widely used in Japan due to its simplicity and empirical validity, but from modern psychological and human resource evaluation perspectives, it has fundamental limitations and problems:
- Outdated diagnostic model: Based on 1950s personality theory without alignment to the current Big Five theory, leading to little citation in recent personality research.
- Overly simple items: Easy for respondents to intentionally "look good," increasing susceptibility to manipulation.
- Static results unsuitable for development: Indicates trait tendencies but offers little guidance on growth directions or skill acquisition.
- Potential for negative labeling: Types like “Neurotic” or “Rebellious” carry risks of being perceived negatively.
- Vulnerable to bias: Straightforward questions facilitate strong social desirability bias, e.g., tendency to claim cooperativeness, which is hard to adjust.
- Weak link to behavior and performance: Focuses on personality tendencies but is difficult to use for job fit or performance prediction, lacking integration with behavioral science or outcome data.
⑤ Conclusion: Limitations on the use of the YG Personality Test
The YG Personality Test has a long history of widespread use in Japan and was effective for screening overall tendencies
and initial personal understanding, but it is based on outdated theories and is incompatible with modern psychology in the VUCA era.
As it is based on an older personality factor theory, it is rarely used in current personality psychology.
The Big Five is now the international standard, and YG falls short in reproducibility, versatility, and theoretical foundation.
Especially, many of the YG’s 12 factors have strong intercorrelations and lack factor independence.
Despite claims of structural organization via factor analysis, its structure lacks transparency.
For example, “Depression (D)” and “Neuroticism (N)” often correlate highly and their psychological distinction is unclear.
The YG test consists of surface-level and predictable questions such as “Are you kind to others?” and “Do you get nervous?”
This makes it easy for respondents to deliberately select positive answers when wanting to be seen favorably or evaluated well.
YG is a “guideline for personality types,” not a tool for “evaluation or judgment.” It has theoretical, empirical, and ethical limitations.
Therefore, relying solely on YG is not recommended. It may be useful as a supplementary tool alongside other aptitude tests.
(The above includes the author’s personal opinions.)