The Harrison Career Guide was developed by Dan Harrison (Ph.D.). The Career guide is part of the Harrison Assessments product that has been used by career consultants and corporation throughout Australia, America, Asia and Europe. It was first computerized in 1991 and has been validated by worldwide research.

The questionnaire has been tested for reliability by having individuals repeat the questionnaire three months after the first completion of the questionnaire. The second answers have a .8 correlation with the original answers. This indicates that the answers are very stable over time.

The results have been compared with MBTI and 16PF showing a significant correlation with similar scales.

Extensive studies have shown at least 80% predictive accuracy when predicting actual job performance (as rated by the employer). This indicates that the instrument is very accurate, especially when contrasted with similar instruments that typically have a 55-60% predictive accuracy.

This high level of accuracy has been demonstrated in a wide variety of job types including management, sales, technical, professional, customer service, administration, and manual work. In all cases, suitability was able to predict job performance with over 80% accuracy.

The Harrison Assessments methodology has been tested in a wide variety of different cultures and ethnic backgrounds and demonstrates a negligible bias toward any race or culture.