Abstract:
The objective of this research was to investigate the psychometric properties of the LEONARD
Personality Inventory (LPI) and to find out the personality profile of working age Thais, between the ages of 20-60
living in Conservative Area of Bangkok, including Pranakorn, Pomprabsatrupai, Dusit, Thonburi, Bangkok Noi,
and Bangplad. Multistage Random Sampling was used in this research. There were 540 subjects in total: 207 males
and 333 females. LPI profiles consisted of 5 personality types: Openness, Neutral, Analytical, Relational and
Decisive. The reliability was at a moderate to high level (.6633-.7859). The mean scores were between 72.20
77.29 and the standard deviation was 6.129-7.181. The higher mean scores were associated with Neutral (77.29),
Analytical (73.81), and Relational (73.43) personality types. The cut off points were Openness (76), Neutral (81),
Analytical (77), Relational (77), and Decisive (75). In fact, in this study 29 profiles were found, as many people
were a mixture of 2 or more personality types.
The results showed that most people who live in the Conservative Area had the Amiable Adaptor
personality profile, which is equivalent to a combination of Neutral, Analytical and Relational. People who have
this profile have the following tendencies: they like to support others; like to live in harmony and try hard not to
hurt peoples feelings; they are diligent and make friend easily; and, they are adaptable to suggestions and ideas of
others. However, on the negative side, they tend to be indecisive and feel anxious quite easily; they can be too
emotional; they also tend to feel depressed easily. Moreover, in this area, 38.9% of sampling group could not be
identified with any personality profile. In addition, the study found significant differences in males and females in
all of the personality types except Neutral. The results showed that the LPI had good psychometric properties and
that it can be an alternative personality test to assess the personality of Thais even though it was not able classify a
significant portion of the sample (38.9%). Therefore, examiners who use this personality test from other countries
should consider individual differences, cultures, value systems and traditions which can affect human personality
and behavior.