Good evidence for construct validity was found using exploratory factor analysis and confirmatory factor analysis. MAIN FINDINGS: Excellent reliability was found for the instrument across groups in the sample.

A cross-sectional study was completed consisting of 10 705 South African respondents.

Classical test theory methods and Rasch analysis were used to evaluate the functioning of the MBTI Form M across gender and ethnic groups. RESEARCH DESIGN, APPROACH AND METHOD: This study falls within the quantitative research paradigm.

MOTIVATION FOR THE STUDY: To add to the continual research and improvement of the MBTI ® Form M through the investigation of its psychometric properties across groups in South Africa. RESEARCH PURPOSE: To investigate the reliability, validity and differential item functioning of the MBTI ® Form M across groups in South Africa using Classical Test Theory (CTT) and Item Response Theory (IRT) methods. ORIENTATION: Psychological instruments require continued refinement, updating and evaluation. Jopie van Rooyen & Partners SA, South Africa As scientifically validated assessments, they are reliable tools for self-knowledge, self-growth, and fulfillment.Evaluating the MBTI ® Form M in a South African context Learning about your personality is certainly fun, but the MBTI instruments are more than entertainment. Many assessments in the market or online today are for entertainment value or to grab your attention to lead you to related products. If you want not only reliable information but to advance steadily in personal growth with personality type, using the official MBTI assessment and working with a certified, expert professional is not only important, it is essential. Can you trust the information they give you?Īnother important question is why pay for an official, validated assessment, such as the MBTI, when there are free (unvalidated) 'knockoffs' all over the internet? The answer is: how seriously do you take self-knowledge and your growth? This is an important question to ask yourself, especially considering the number of personality surveys online that are not validated or scientifically tested in any way. What is the value of taking an assessment for insight and guidance if it has not been tested to give you reliable results around the concepts that it claims to measure? Scientific validation of a self-reported psychological assessment is very important, yet it is uncommon for instruments to be validated outside of academic research centers.

Reliability and validity of mbti