This book is the first tutorial for those who want to independently learn how to determine the type of information metabolism of the psyche. The theoretical material necessary for determining TIM is presented in detail and in a popular form. The manual includes more than 500 examples illustrating the thinking of representatives of different TIMs, self-study exercises on all key topics are proposed, the results of long-term observations and experiments conducted at the Kyiv School of System Socionics are described. For the first time, a collection of indicators of socionic functions with illustrative examples is published.