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«There are 96 balls in a box, all weighing the same but one, which is lighter. By means of platform scales, how many weighings are needed to identify the lighter ball without mistake?»

Here’s just one of the questions answered in this book, illustrating the story, the features, and the applications of the most famous intelligence and personality tests. The most common types of logical and psychological puzzles are presented in a fascinating way, making the scientific explanations behind such problems very easy to understand.
Playing with games and riddles the readers discover how personality and intellectual faculties are measured, and can test their own skills. A classic from the Italian leader in training for selective tests.

How to face intelligence and personality tests; speech, mathematical, logic, and illustration logic puzzles, with solutions and commentaries; the “most difficult puzzle ever”; a final IQ test.

This book is the result of the contributions from various authors that collaborated with Alpha Test throughout the years: psychologists, physicists, logic tests experts who have trained thousands of students and professionals over the years and have consulted for the design and application of such tests, both in a professional and educational environment.