This document discusses case interviews as a tool for staff selection in consulting companies. It describes the origins of the case method at Harvard Business School in 1924 and its introduction to Ukraine in the late 1990s. The main types of cases used in interviews are outlined as brainteasers, consulting math, market sizing, profitability, market studies, and merger and acquisition cases. Common mistakes in case interviews are listed as anxiety, inability to count quickly, and an unspecified third. Finally, secrets to success are described as perception of information, solving the task, and time management.