The assessments on the TestsonPersonality Network are all short tests which have been designed to meet the standards for reliability and norms set out by The European Federation of Psychologists' Associations (EFPA) in the EFPA Test Review Criteria.

Nearly all the assessments are 10-item scales which have balanced keying (an equal number of positive and negative statements). Test takers respond to statements using a widely used five-point Likert scale measuring how far they agree or disagree with the statements. The scale statements have been selected carefully to reflect contemporary knowledge and thinking about the area in question - for example, a large number of the personality scales are based on the "Big Five" factor model of human personality and many include benchmark items from the International Personality Item Pool.

The reliability of nearly all the scales are within the range defined as adequate (e.g. r = 0.7 to 0.79) or good (e.g. r = 0.8 to 0.89) by the EFPA and the global norms' sample sizes are nearly all very large (1000+). Feedback is provided using percentile scores where an individual's raw score is converted to a number indicating the percentage of the norm group who scored below the test taker. For example, a score at the 60th percentile means that the individual's score is the same as or higher than the scores of 60% of those who have taken the test.

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