Introduction.- Part I. Assertiveness as an educable skill for citizenship and professional betterment.- 1. Assertiveness in Education: A core skill for raising social awareness, communicating effectively, and succeeding in the workplace.- 2. Assertiveness, citizenship, and subjective well-being in higher education students.- 3. Assertiveness and empathy as educable social skills for human development: A challenge for education in the 21st Century.- 4. Long live the people, the people who are alive!.- PART II. Assertiveness in University Students.- 5. Diagnosis of Assertiveness for first-year university Students at an education college.- 6. Development of Assertive Thinking in Analytic Geometry Students at the Faculty of Engineering of the UAEMex: A Case Stud.- 7. Assertiveness in Higher Education: A Proposal from the Faculty of Philosophy of the Autonomous University of Queretaro.- 8. Assertiveness in university students: Exploration and educational proposal.- PART III. Assertiveness as a core competence in the teaching profession.- 9. Teachers' assertive communication for the inclusive environment's generation.- 10. The Reading Circuit as a Transcultural Foundation for Assertiveness in the Classroom.- 11. Assertiveness: elemental competence in initial teacher training.- 12. Assertiveness in the University Professor Teaching. Results of the Pilot Test.- 13. Assertive Relationship Between Teacher and Student, Starting Point to Build Healthy Interpersonal Relationships.- 14. Reflections on the importance of assertiveness in the educational and pedagogical field and future perspectives.