Professional training of personnel is acquiring particular importance today and is becoming an integral condition for the successful functioning of any organization. The first part of the book is devoted to general issues of professional training of personnel. It examines the requirements of a market economy for the quality of the workforce, legislative acts and regulations on the organization of vocational training of workers, forms, methods, technologies, efficiency indicators of in-house vocational training of personnel; the features of vocational training for laid-off workers and unemployed citizens are outlined, as well as foreign experience in training workers. The second part summarizes the experience of organizing in-house personnel training using the example of the gas industry. It outlines the features of organizing training for workers, developing curricula and programs, improving the forms and methods of practical and theoretical training, and provides recommendations for training in the operation and repair of underground gas pipelines, gas equipment of residential buildings, municipal and industrial enterprises. The book is addressed to managers and specialists of enterprises and organizations of all industries, forms of ownership and types of activity, as well as vocational education institutions and employment services.