High school principals 119 High school teachers 99 Educational leadership 93 High school students 82 School management and organization 78 Attitudes 58 Study and teaching (Secondary) 48 High schools 43 Dissertations 41 Teachers 41 Dissertations, Academic 39 Teacher-principal relationships 37 Job satisfaction 30 Education, Secondary 29 Education 27 Psychological aspects 23 English language 22 Study and teaching 22 Rating of 18 Administration 15 School principals 15 Academic achievement 14 Curricula 13 Job stress 13 Social aspects 11 Case studies 10 Curriculum planning 10 School discipline 10 Professional ethics 9 Social conditions 9