This book is aimed at both students of the 3rd grade of the Vocational High School in the field of "Economic and Administrative Services" and educators who seek to approach the learning process according to modern teaching perception. An innovation is the space for practice that accompanies each exercise, in order to help the student organize his study.

Each chapter includes:
- Detailed development of the theory of the textbook in the form of open-ended questions
- Additional information on the topics covered by the book in the form of knowledge enrichment
- Supplementary closed-ended questions for understanding the theory
- Instructions for solving exercises, as well as solved exercises and problems
- Solutions to all exercises and problems in the textbook
- Exercises and problems with space for their solution
- Exams

In an appendix, finally, the answers to all the supplementary questions, exercises, problems, and exams are given.