Psychological aspects Teachers Teacher-principal relationships 7 Educational leadership 6 Job satisfaction 5 Job stress 5 Employee motivation 3 Attitudes 2 High school principals 2 Bullying in schools 1 COVID-19 (Disease) 1 Computer-assisted instruction 1 Discipline 1 Exercise 1 Health aspects 1 High school students 1 Inventories 1 Motivation in education 1 Music 1 Physical education and training 1 Professional relationships 1 Psychology 1 School supervision, Secondary 1 Social aspects 1 Stress (Psychology) 1 Stress management 1 Supervision of 1 Testing 1 Training of 1 Women teachers 1