The most notable strength of trait theory is its clarity, which makes it easily understood. This ease of understanding makes trait theory easy to implement, facilitating its use in the development of several assessment devices for patients. Its major weakness is that it does not fully address why or how traits develop. Due to its statistical nature, trait theory offers no clarification of personality development.
Other strengths include:
- Objectivity: Trait theory completely relies on statistical analysis or hard data. Unlike several other theories, the personal experience or subjectivity of the theorists is not considered in trait theory. Since the personal interpretation of subjective factors can lead to bias ideas; trait theory has no bias.
Other weaknesses include:
- It cannot predict future behavior: Trait theory does not substantially account for personality changes, both temporarily and in the long term. Since it does not address trait development, it offers little or no guidance on how to change trait aspects. It does not address how positive traits can be highlighted or how negative traits can be ameliorated.
Unlike the other theories of personality like humanistic or psychoanalytic theories, the trait theory approach to personality focuses primarily on the differences between people. The interaction and combination of different traits leads to the formation of personality that is unique to each individual. Trait theory identifies and measures these personality characteristics.