| 18 | C (Programmiersprache) |
| 36 | CAM-Technik |
| 1275 | CD-ROM |
| 523 | CDU |
| 81 | CIM (Computer Integrated Manufacturing) |
| 193 | CLIL |
| 76 | COVID-19 |
| 10 | COVID-19 (Disease) |
| 40 | COVID-19 Pandemic, 2020- |
| 147 | CSU |
| 8 | Caemmerer, Dora von |
| 122 | Caesar, Gaius Julius |
| 8 | Cafeteria |
| 9 | Cai, Yuanpei |
| 14 | Calif. |
| 124 | California |
| 7 | California State University |
| 84 | Callcenter |
| 50 | Calvin, Jean |
| 50 | Calvin, Johannes |
| 65 | Calvinismus |
| 7 | Cambodia |
| 122 | Cambridge |
| 12 | Campanella, Tommaso |
| 196 | Campe, Joachim Heinrich |
| 6 | Camping |
| 176 | Campus |
| 8 | Campus violence |
| 33 | Camus, Albert |
| 51 | Canada |
| 9 | Cancer |
| 14 | Canetti, Elias |
| 13 | Canisius, Petrus |
| 130 | Cannabis |
| 6 | Cantor, Georg |
| 11 | Capitalism |
| 7 | Capitalism and education |
| 20 | Care |
| 7 | Career |
| 20 | Career Center |
| 11 | Career Choice |
| 20 | Career Counseling |
| 6 | Career Counselor |
| 20 | Career Guidance |
| 6 | Career Path |
| 15 | Career Planning |
| 34 | Career Service |
| 7 | Career adaptability |
| 9 | Career counseling |
| 161 | Career development |
| 50 | Career development planning |
| 44 | Career education |
| 6 | Career preparation |
| 55 | Careers |
| 12 | Caring |
| 139 | Caritas |
| 10 | Carlebach, Joseph |
| 9 | Carnegie Corporation |
| 10 | Carroll, Lewis |
| 22 | Cartellverband der Katholischen Deutschen Studentenverbindungen |
| 21 | Cartesianismus |
| 219 | Cartoon |
| 835 | Case Management |
| 315 | Case Study |
| 6 | Case method |
| 267 | Case studies |
| 243 | Case study |
| 41 | Cassirer, Ernst |
| 8 | Castro, Fidel |
| 29 | Catholic Church |
| 15 | Catholic University |
| 41 | Catholic schools |
| 15 | Catholic universities and colleges |
| 33 | Catholicism |
| 55 | Catullus, Gaius Valerius |
| 14 | Causal Model |
| 24 | Celan, Paul |
| 39 | Celle |
| 16 | Celtis, Conrad |
| 6 | Censorship |
| 6 | Central Asia |
| 15 | Central High School |
| 11 | Centrality |
| 56 | Certification |
| 36 | Ceylon |
| 7 | Cham |
| 131 | Chancengerechtigkeit |
| 156 | Chancengleichheit |
| 36 | Change |
| 6 | Change Agent |
| 10 | Change Process |
| 14 | Change Question |
| 173 | Chaos |
| 43 | Chaosforschung |
| 170 | Chaostheorie |
| 8 | Chaplin, Charles Spencer |
| 14 | Character |
| 9 | Characteristic scores and scales |
| 165 | Charakter |
| 140 | Charakterbildung |
| 1926 | Charaktererziehung |
| 74 | Charakterisierung |
| 83 | Charakteristik |
| 22 | Charakterkunde |
| 22 | Charakterologie |
| 65 | Charisma |
| 11 | Charkow |
| 7 | Charlotte, N.C. |
| 155 | Charter School |
| 40 | Charter school |
| 43 | Charter schools |
| 40 | Charter-Schule |
| 11 | Chassidismus |
| 428 | Chat |
| 428 | Chatten (Kommunikation) |
| 14 | Chauvinismus |
| 7 | Cheating |
| 24 | Cheerleading |
| 7 | Chemical Abstract |
| 10 | Chemical Engineering |
| 6292 | Chemie |
| 227 | Chemie (Studium) |
| 1107 | Chemiedidaktik |
| 26 | Chemiefacharbeiter |
| 16 | Chemiefaser |
| 245 | Chemieindustrie |
| 34 | Chemielaborant |
| 331 | Chemielehrer |
| 227 | Chemiestudium |
| 1046 | Chemieunterricht |
| 66 | Chemikalie |
| 26 | Chemikant |
| 133 | Chemiker |
| 18 | Chemisch-technischer Assistent |
| 281 | Chemische Analyse |
| 129 | Chemische Bindung |
| 76 | Chemische Formel |
| 11 | Chemische Gleichung |
| 731 | Chemische Reaktion |
| 44 | Chemische Struktur |
| 24 | Chemische Waffen |
| 24 | Chemischer Kampfstoff |
| 93 | Chemisches Element |
| 130 | Chemisches Gleichgewicht |
| 16 | Chemisches Labor |
| 19 | Chemistry |
| 405 | Chemnitz |
| 18 | Chicago |
| 18 | Chicago <Ill.> |
| 893 | Child |
| 9 | Child abuse |
| 59 | Child at risk |
| 27 | Child care |
| 141 | Child development |
| 14 | Child psychology |
| 29 | Child rearing |
| 7 | Child welfare |
| 6 | Childcare |
| 22 | Childhood |
| 924 | Children |
| 37 | Children & youth |
| 20 | Children of immigrants |
| 16 | Children of minorities |
| 17 | Children with autism spectrum disorders |
| 170 | Children with disabilities |
| 28 | Children with mental disabilities |
| 84 | Children with social disabilities |
| 7 | Children's books |
| 37 | Children's literature |
| 22 | Children's rights |
| 27 | Chile |
| 7 | Chiliasmus |
| 299 | China |
| 160 | Chinese |
| 6 | Chinese Scientist |
| 6 | Chinese language |
| 7 | Chinese universities |
| 12 | Chinesisch |
| 6 | Chinesischunterricht |
| 31 | Chirurgie |
| 12 | Chlup, Otokar |
| 18 | Chodowiecki, Daniel |
| 37 | Choice of school |
| 13 | Cholera |
| 16 | Chopin, Frédéric |
| 276 | Chor |
| 250 | Choreografie |
| 250 | Choreographie |
| 23 | Chorleitung |
| 387 | Christ |
| 173 | Christenlehre |
| 2823 | Christentum |
| 29 | Christenverfolgung |
| 7 | Christian |
| 29 | Christian college |
| 7 | Christian college students |
| 58 | Christian education |
| 25 | Christian universities and colleges |
| 53 | Christianisierung |
| 29 | Christianity |
| 16 | Christin |
| 523 | Christlich-Demokratische Union Deutschlands |
| 147 | Christlich-Soziale Union in Bayern |
| 1229 | Christliche Erziehung |
| 133 | Christliche Ethik |
| 46 | Christliche Existenz |
| 22 | Christliche Gemeinschaft |
| 31 | Christliche Kirche |
| 161 | Christliche Kunst |
| 11 | Christliche Partei |
| 17 | Christliche Philosophie |
| 2796 | Christliche Religion |
| 54 | Christliche Soziallehre |
| 20 | Christliche Weltanschauung |
| 22 | Christlicher Humanismus |
| 31 | Christliches College |
| 17 | Christliches Jugenddorfwerk |
| 16 | Christliches Jugenddorfwerk Deutschlands |
| 245 | Christologie |
| 573 | Chronik |
| 73 | Chronisch Kranker |
| 393 | Chronische Krankheit |
| 138 | Chronologie |
| 53 | Church |
| 17 | Church and education |
| 10 | Church school |
| 9 | Church schools |
| 53 | Churches |
| 8 | Churchill, Winston |
| 163 | Cicero, Marcus Tullius |
| 141 | Circuit-Training |
| 81 | Citation |
| 109 | Citation Analysis |
| 13 | Citation Behavior |
| 6 | Citation Context |
| 81 | Citation Count |
| 23 | Citation Data |
| 6 | Citation Database |
| 24 | Citation Distribution |
| 84 | Citation Impact |
| 75 | Citation Index |
| 24 | Citation Network |
| 14 | Citation Pattern |
| 80 | Citation Rate |
| 9 | Citation Score |
| 17 | Citation Window |
| 6 | Citation advantage |
| 281 | Citation analysis |
| 6 | Citation classification |
| 9 | Citation context |
| 10 | Citation context analysis |
| 16 | Citation count |
| 15 | Citation counts |
| 13 | Citation distribution |
| 7 | Citation function |
| 59 | Citation impact |
| 8 | Citation index |
| 8 | Citation metrics |
| 36 | Citation network |
| 19 | Citation networks |
| 9 | Citation recommendation |
| 6 | Citation window |
| 192 | Citations |
| 6 | CiteScore |
| 12 | CiteSpace |
| 8 | Cited references |
| 14 | Citizen participation |
| 8 | Citizens'' participation' |
| 40 | Citizenship |
| 36 | Civics |
| 27 | Civil Rights |
| 6 | Civil rights |
| 16 | Civil rights movement |
| 11 | Civil rights movements |
| 8 | Civil service |
| 7 | Civil society |
| 8 | Clairvaux, Bernhard de |
| 15 | Claparède, Edouard |
| 24 | Class size |
| 10 | Classes (Éducation) |
| 7 | Classical education |
| 7 | Classical philology |
| 35 | Classification |
| 10 | Classification system |
| 18 | Classroom |
| 16 | Classroom Management |
| 6 | Classroom Observation |
| 13 | Classroom Teacher |
| 6 | Classroom Teaching |
| 107 | Classroom environment |
| 8 | Classroom learning centers |
| 232 | Classroom management |
| 21 | Classrooms |
| 6 | Clausewitz, Carl von |
| 41 | Clausthal |
| 17 | Clausthal-Zellerfeld |
| 15 | Climate change |
| 9 | Clinical Medicine |
| 9 | Clinical psychology |
| 6 | Clinical trials |
| 18 | Cloppenburg |
| 23 | Cloud-Computing |
| 62 | Clown |
| 21 | Club |
| 24 | Club of Rome |
| 21 | Clubs |
| 130 | Cluster |
| 19 | Cluster Analysis |
| 26 | Cluster analysis |
| 28 | Clustering |
| 8 | Co-Teaching |
| 75 | Co-authorship |
| 6 | Co-authorship analysis |
| 21 | Co-authorship network |
| 20 | Co-authorship networks |
| 16 | Co-citation |
| 26 | Co-citation analysis |
| 7 | Co-citation network |
| 19 | Co-operation |
| 7 | Co-operative education |
| 43 | Co-word analysis |
| 19 | Coaching |
| 15 | Coauthorship |
| 62 | Coburg |
| 9 | Cocitation Analysis |
| 97 | Code |
| 44 | Cognition |
| 10 | Cognition & reasoning |
| 28 | Cognition in children |
| 8 | Cognitive Development |
| 7 | Cognitive Process |
| 7 | Cognitive Structure |
| 12 | Cognitive ability |
| 31 | Cognitive learning |
| 13 | Cognitive neuroscience |
| 6 | Cognitive psychology |
| 6 | Cognitive science |
| 19 | Cognitive style |
| 9 | Cognitive styles |
| 8 | Cognitive therapy |
| 6 | Coherence |
| 15 | Cohn, Jonas |
| 121 | Collaboration |
| 11 | Collaboration Network |
| 13 | Collaboration Pattern |
| 24 | Collaboration network |
| 8 | Collaboration networks |
| 12 | Collaboration patterns |
| 7 | Collaborations |
| 7 | Collaborative Learning |
| 12 | Collaborative Research |
| 30 | Collective bargaining |
| 2801 | College |
| 6 | College Campus |
| 7 | College Education |
| 10 | College Experience |
| 7 | College Faculty |
| 45 | College administration |
| 44 | College administrator |
| 42 | College administrators |
| 6 | College adminstration |
| 31 | College admission |
| 59 | College applicants |
| 59 | College applications |
| 6 | College athletes |
| 24 | College attendance |
| 16 | College buildings |
| 24 | College campuses |
| 57 | College choice |
| 61 | College costs |
| 8 | College credits |
| 18 | College dropouts |
| 22 | College entrance achievement tests |
| 22 | College entrance examinations |
| 23 | College environment |
| 8 | College faculty |
| 21 | College freshmen |
| 30 | College graduates |
| 6 | College integration |
| 6 | College personnel management |
| 18 | College preparation |
| 18 | College preparation programs |
| 33 | College president |
| 32 | College presidents |
| 24 | College programs |
| 11 | College readers |
| 9 | College registrars |
| 6 | College sports |
| 116 | College student |
| 20 | College student development programs |
| 136 | College student orientation |
| 528 | College students |
| 19 | College students with disabilities |
| 189 | College teacher |
| 188 | College teachers |
| 10 | College teachers, Part-time |
| 109 | College teaching |
| 8 | College trustees |
| 14 | College-school cooperation |
| 48 | Collegelehrer |
| 1067 | Colleges |
| 39 | Colleges & universities |
| 39 | Collegesport |
| 431 | Collegestudent |
| 11 | Collegestudentin |
| 8 | Collegestudents |
| 36 | Collegeunterricht |
| 9 | Collegium Fridericianum |
| 7 | Colo. |
| 8 | Colombia |
| 8 | Colonialism |
| 32 | Colorado |
| 13 | Columbia |
| 180 | Comenius, Johann Amos |
| 14 | Comenius-Gesellschaft |
| 32 | Comic |
| 6 | Comic books, strips, etc |
| 7 | Comic strip |
| 7 | Commercial Search Engine |
| 6 | Commercialization |
| 40 | Common Core State Standards (Education) |
| 16 | Common Sense |
| 44 | Common core curriculum |
| 9 | Common good |
| 148 | Commonwealth |
| 116 | Communication |
| 8 | Communication disorders |
| 75 | Communication in education |
| 14 | Communication system |
| 6 | Communicative disorders in children |
| 10 | Communities of practice |
| 187 | Community |
| 202 | Community College |
| 23 | Community Development |
| 6 | Community Participation |
| 41 | Community and college |
| 117 | Community and school |
| 68 | Community college |
| 18 | Community college students |
| 92 | Community colleges |
| 9 | Community detection |
| 15 | Community education |
| 9 | Community school |
| 6 | Community schools |
| 8 | Compact Disc |
| 27 | Comparative Analysis |
| 10 | Comparative Education Society |
| 7 | Comparative Perspective |
| 6 | Comparative Research |
| 20 | Comparative analysis |
| 89 | Comparative education |
| 7 | Comparison |
| 9 | Compensation |
| 28 | Competence |
| 24 | Competency |
| 21 | Competency based education |
| 36 | Competency-based Education |
| 9 | Competition |
| 8 | Complex network |
| 9 | Complex networks |
| 7 | Complex systems |
| 6 | Complexity |
| 293 | Composition |
| 72 | Composition (Language arts) |
| 263 | Composition and exercises |
| 12 | Comprehension |
| 7 | Comprehensive School |
| 310 | Computer |
| 12 | Computer & video games |
| 99 | Computer Assisted Design |
| 13 | Computer Science |
| 8 | Computer assisted instruction |
| 3897 | Computer im Unterricht |
| 15 | Computer literacy |
| 33 | Computer network resources |
| 36 | Computer networks |
| 7 | Computer program |
| 6 | Computer programming |
| 32 | Computer science |
| 12 | Computer simulation |
| 155 | Computer-assisted instruction |
| 53 | Computeranimation |
| 55 | Computeranwendung |
| 5003 | Computergestütztes Lernen |
| 280 | Computergrafik |
| 12 | Computerindustrie |
| 11 | Computerkenntnisse |
| 21 | Computerkunst |
| 39 | Computermusik |
| 343 | Computernetz |
| 343 | Computernetze |
| 65 | Computerprogramm |
| 35 | Computers |
| 7 | Computers and children |
| 14 | Computers and literacy |
| 1164 | Computersimulation |
| 2005 | Computerspiel |
| 42 | Computersystem |
| 330 | Computerunterstützter Unterricht |
| 5003 | Computerunterstütztes Lernen |
| 1171 | Computerunterstütztes Verfahren |
| 27 | Computervirus |
| 21 | Comte, Auguste |
| 198 | Concept Map |
| 7 | Concept formation |
| 190 | Conceptual Change |
| 25 | Conceptual Framework |
| 10 | Conceptual Model |
| 10 | Condorcet, Jean Antoine Nicolas de Caritat de |
| 82 | Conduct of life |
| 10 | Conduite |
| 6 | Conference |
| 14 | Conference papers and proceedings |
| 6 | Confidence |
| 16 | Conflict management |
| 143 | Congress |
| 143 | Congresses |
| 43 | Connecticut |
| 7 | Consciousness |
| 14 | Construct Validity |
| 22 | Construction process |
| 16 | Constructivism |
| 10 | Constructivism (Education) |
| 13 | Containerschiff |
| 21 | Content Analysis |
| 34 | Content analysis |
| 193 | Content and language integrated learning |
| 49 | Content area reading |
| 41 | Continuing education |
| 9 | Convergence |
| 6 | Conversation |
| 8 | Cook, James |
| 27 | Cooperation |
| 7 | Cooperative education |
| 9 | Cooperative learning |
| 9 | Copei, Friedrich |
| 6 | Coping Strategy |
| 16 | Copyright |
| 7 | Copyright Committee |
| 9 | Copyright Holder |
| 9 | Copyright Infringement |
| 9 | Copyright Issue |
| 14 | Copyright Owner |
| 6 | Copyright Policy |
| 21 | Core Journal |
| 11 | Core curriculum |
| 7 | Core documents |
| 76 | Coronavirus |
| 8 | Corporate Member |
| 13 | Corporate Social Responsibility |
| 21 | Corporate University |
| 9 | Correctional institutions |
| 64 | Correlation |
| 12 | Correlation analysis |
| 53 | Correlation with content subjects |
| 11 | Correspondence |
| 14 | Correspondence Analysis |
| 15 | Corrupt practices |
| 17 | Corruption |
| 71 | Cost |
| 894 | Cost-Benefit-Analysis |
| 170 | Costa Rica |
| 72 | Costs |
| 262 | Cottbus |
| 69 | Coubertin, Pierre de |
| 84 | Counseling |
| 7 | Counseling in elementary education |
| 24 | Counseling in higher education |
| 13 | Counseling in secondary education |
| 15 | Counseling of |
| 64 | Counselling |
| 13 | Counselor education |
| 12 | Country |
| 19 | Country Music |
| 6 | County Public School |
| 7 | Coverage |
| 76 | Covid-19 |
| 6 | Creative People |
| 14 | Creative ability |
| 12 | Creative ability in children |
| 35 | Creative activities and seat work |
| 23 | Creative aptitude |
| 6 | Creative nonfiction |
| 36 | Creative teaching |
| 68 | Creative thinking |
| 6 | Creative thinking in children |
| 50 | Creative writing |
| 22 | Creative writing (Elementary education) |
| 6 | Creative writing (Middle school) |
| 26 | Creativity |
| 13 | Cricket |
| 17 | Crime |
| 10 | Crimes |
| 10 | Crimes against |
| 8 | Crisis management |
| 11 | Critical Analysis |
| 7 | Critical Incident |
| 8 | Critical Issue |
| 7 | Critical Review |
| 7 | Critical discourse analysis |
| 124 | Critical pedagogy |
| 10 | Critical race theory |
| 19 | Critical reflection |
| 16 | Critical theory |
| 130 | Critical thinking |
| 12 | Criticism |
| 15 | Criticism and interpretation |
| 213 | Cross Cultural Psychology |
| 94 | Cross cultural studies |
| 94 | Cross-cultural studies |
| 7 | Crucial Role |
| 8 | Cuba |
| 6 | Cuban |
| 8 | Cultural Context |
| 8 | Cultural Difference |
| 6 | Cultural Heritage |
| 7 | Cultural Revolution |
| 95 | Cultural Studies |
| 7 | Cultural Tradition |
| 132 | Cultural behavior |
| 132 | Cultural behaviour |
| 8 | Cultural capital |
| 10 | Cultural identity |
| 19 | Cultural pluralism |
| 130 | Culturally relevant pedagogy |
| 6 | Culturally sustaining pedagogy |
| 165 | Culture |
| 7 | Cumulative Advantage |
| 12 | Curie, Marie |
| 7 | Current Practice |
| 6 | Current Situation |
| 9 | Current Trend |
| 364 | Curricula |
| 840 | Curriculum |
| 6 | Curriculum Design |
| 13 | Curriculum Development |
| 8 | Curriculum Reform |
| 66 | Curriculum Study |
| 34 | Curriculum change |
| 7 | Curriculum development |
| 9 | Curriculum evaluation |
| 153 | Curriculum planning |
| 8 | Curriculum, instruction & assessment |
| 11 | Curriculum-based assessment |
| 104 | Curriculumentwicklung |
| 110 | Curriculumevaluation |
| 48 | Curriculumforschung |
| 850 | Curriculumplanung |
| 1278 | Curriculumreform |
| 13 | Customs |
| 8 | Cyber-Bullying |
| 10 | Cyberbullying |
| 272 | Cyberspace |
| 43 | Czernowitz |
| 93 | Côte d'ivoire |
