The manual introduces future managers specializing in business informatics to the technology of modeling enterprise architecture in detail. The free version of ADOit (Common edition) system, developed by the Austrian company BOC and widely used for enterprise management in many countries, as well as for training managers at universities and business schools, is used as software for modeling enterprise architecture. The choice of enterprise architecture modeling examples is conditioned by the relevance of tasks from different areas of managers' activity. Here tasks of modeling of the enterprises of small business, university, bank, the specialized enterprises focused on information technologies are considered. The manual also can be useful for operating managers mastering and using ADOit system.This book has been translated with Artificial Intelligence.