Keyword Index

A

  • Academic Motivation Comparing the Impacts of E-learning and Conventional Education on Students’ Academic Motivation and Performance: A Descriptive Study [Volume 11, Issue 3, 2020, Pages 170-179]
  • Academic Performance Comparing the Impacts of E-learning and Conventional Education on Students’ Academic Motivation and Performance: A Descriptive Study [Volume 11, Issue 3, 2020, Pages 170-179]
  • Academics achievement Effectiveness of E-Learning among Hospitalized Elementary Students with Chronic Diseases [Volume 11, Issue 3, 2020, Pages 191-199]
  • Active Learning Proactive Teaching: Development and Validation of a Scale to Evaluate Constructivist Teaching in Higher Education [Volume 11, Issue 1, 2020, Pages 1-12]
  • Annotation The Effect of Online Interpretations via Interactive White Boards on Vocabulary Learning [Volume 11, Issue 1, 2020, Pages 37-45]
  • Artificial Intelligence The Role of Artificial Intelligence in the Future of Education [Volume 11, Issue 1, 2020, Pages 65-67]
  • Audio The Effects of Audio-Only and Audio-Video Materials on Listening Comprehension and Critical Thinking among Dental Students: A Focus Group Analysis [Volume 11, Issue 4, 2020, Pages 215-223]
  • Audio-video The Effects of Audio-Only and Audio-Video Materials on Listening Comprehension and Critical Thinking among Dental Students: A Focus Group Analysis [Volume 11, Issue 4, 2020, Pages 215-223]
  • Auditory definition The Effect of Online Interpretations via Interactive White Boards on Vocabulary Learning [Volume 11, Issue 1, 2020, Pages 37-45]
  • Augmented reality An investigation into the Factors Affecting Perceived Enjoyment of Learning in Augmented Reality: A Path Analysis [Volume 11, Issue 4, 2020, Pages 224-235]

B

  • Bartle Player Styles Investigating the Components of Educational Game Design Based on Explorer Player Style: A Systematic Literature Review [Volume 11, Issue 3, 2020, Pages 139-152]
  • Blended Learning A Comparison Between the Effectiveness of E-learning and Blended Learning in Industrial Training [Volume 11, Issue 1, 2020, Pages 46-53]
  • Blended Learning Blended Teaching/Learning Approach in Medical Schools: Need of the Day in the 21st Century [Volume 11, Issue 4, 2020, Pages 265-268]

C

  • Challenges The Challenges of Implementing E-learning Courses in Iran’s Higher Education: A University Management Perspective [Volume 11, Issue 4, 2020, Pages 246-255]
  • Chronic diseases Effectiveness of E-Learning among Hospitalized Elementary Students with Chronic Diseases [Volume 11, Issue 3, 2020, Pages 191-199]
  • Clinical teaching Blended Teaching/Learning Approach in Medical Schools: Need of the Day in the 21st Century [Volume 11, Issue 4, 2020, Pages 265-268]
  • Clip Thinking The Role and Influence of “Clip Thinking” on the Educational Process in Higher Medical Institutions [Volume 11, Issue 1, 2020, Pages 61-64]
  • Cognitive absorption An investigation into the Factors Affecting Perceived Enjoyment of Learning in Augmented Reality: A Path Analysis [Volume 11, Issue 4, 2020, Pages 224-235]
  • Collaborative Learning Investigating the Effects of Problem-Based Learning in a Virtual Group on Collaborative Learning, Social Presence and Student Satisfaction in Surgery Department [Volume 11, Issue 2, 2020, Pages 102-111]
  • Competencies The Competencies Expected of Instructors in Massive Open Online Courses (MOOCs) [Volume 11, Issue 2, 2020, Pages 69-83]
  • Computer literacy Validating the Persian Version of ICT Engagement Questionnaire [Volume 11, Issue 2, 2020, Pages 92-101]
  • Constructivist teaching Proactive Teaching: Development and Validation of a Scale to Evaluate Constructivist Teaching in Higher Education [Volume 11, Issue 1, 2020, Pages 1-12]
  • Conventional education Comparing the Impacts of E-learning and Conventional Education on Students’ Academic Motivation and Performance: A Descriptive Study [Volume 11, Issue 3, 2020, Pages 170-179]
  • COVID 19 Designing Quality E-Learning Environments for Emergency Remote Teaching in Coronavirus Crisis [Volume 11, Issue 2, 2020, Pages 135-137]
  • COVID-19 The Unanticipated Educational Challenges of Developing Countries in Covid-19 Crisis: A Brief Report [Volume 11, Issue 2, 2020, Pages 130-134]
  • COVID-19 Webinar Technology: Developing Teacher Training Programs for Emergency Remote Teaching amid COVID-19 [Volume 11, Issue 3, 2020, Pages 200-203]
  • COVID-19 Effectiveness of E-Curriculum in Social Networks during the COVID-19 Pandemic: Parents’, Teachers’ and Students’ Perspectives [Volume 11, Issue 4, 2020, Pages 207-214]
  • COVID-19 pandemic Blended Teaching/Learning Approach in Medical Schools: Need of the Day in the 21st Century [Volume 11, Issue 4, 2020, Pages 265-268]
  • Critical thinking The Effects of Audio-Only and Audio-Video Materials on Listening Comprehension and Critical Thinking among Dental Students: A Focus Group Analysis [Volume 11, Issue 4, 2020, Pages 215-223]
  • Curriculum Investigating the Tendency towards Research in the Curriculum of a Paramedical Faculty [Volume 11, Issue 2, 2020, Pages 121-129]
  • Curriculum Effectiveness of E-Curriculum in Social Networks during the COVID-19 Pandemic: Parents’, Teachers’ and Students’ Perspectives [Volume 11, Issue 4, 2020, Pages 207-214]

D

  • Developing countries The Challenges of Implementing E-learning Courses in Iran’s Higher Education: A University Management Perspective [Volume 11, Issue 4, 2020, Pages 246-255]
  • Development Proactive Teaching: Development and Validation of a Scale to Evaluate Constructivist Teaching in Higher Education [Volume 11, Issue 1, 2020, Pages 1-12]
  • Discovery Game Investigating the Components of Educational Game Design Based on Explorer Player Style: A Systematic Literature Review [Volume 11, Issue 3, 2020, Pages 139-152]
  • Disruptive Technology The Role of Artificial Intelligence in the Future of Education [Volume 11, Issue 1, 2020, Pages 65-67]
  • Distance Learning Letter to the Editor: The Role of Emojis in E-Learning [Volume 11, Issue 3, 2020, Pages 204-205]
  • Distance University The Effect of Labor Market Conditions on Enrollment Rate in Iran’s Distance Universities: A Case Study of Payame Noor University [Volume 11, Issue 3, 2020, Pages 153-161]

E

  • E-curriculum Effectiveness of E-Curriculum in Social Networks during the COVID-19 Pandemic: Parents’, Teachers’ and Students’ Perspectives [Volume 11, Issue 4, 2020, Pages 207-214]
  • EdTech The Role of Artificial Intelligence in the Future of Education [Volume 11, Issue 1, 2020, Pages 65-67]
  • Educational Investigating the Tendency towards Research in the Curriculum of a Paramedical Faculty [Volume 11, Issue 2, 2020, Pages 121-129]
  • Educational Game Design Investigating the Components of Educational Game Design Based on Explorer Player Style: A Systematic Literature Review [Volume 11, Issue 3, 2020, Pages 139-152]
  • Educational Process The Role and Influence of “Clip Thinking” on the Educational Process in Higher Medical Institutions [Volume 11, Issue 1, 2020, Pages 61-64]
  • Educational Technology Validating the Persian Version of ICT Engagement Questionnaire [Volume 11, Issue 2, 2020, Pages 92-101]
  • Efficiency Efficiency Evaluation of E-Learning Courses at Payam Noor University Based on Learning Usability Criteria [Volume 11, Issue 4, 2020, Pages 236-245]
  • E- Learning A Comparison Between the Effectiveness of E-learning and Blended Learning in Industrial Training [Volume 11, Issue 1, 2020, Pages 46-53]
  • E-Learning Designing Quality E-Learning Environments for Emergency Remote Teaching in Coronavirus Crisis [Volume 11, Issue 2, 2020, Pages 135-137]
  • E-Learning Comparing the Impacts of E-learning and Conventional Education on Students’ Academic Motivation and Performance: A Descriptive Study [Volume 11, Issue 3, 2020, Pages 170-179]
  • E-Learning Effectiveness of E-Learning among Hospitalized Elementary Students with Chronic Diseases [Volume 11, Issue 3, 2020, Pages 191-199]
  • E-Learning The Challenges of Implementing E-learning Courses in Iran’s Higher Education: A University Management Perspective [Volume 11, Issue 4, 2020, Pages 246-255]
  • E-Learning Efficiency Evaluation of E-Learning Courses at Payam Noor University Based on Learning Usability Criteria [Volume 11, Issue 4, 2020, Pages 236-245]
  • E-Learning Effectiveness of E-Curriculum in Social Networks during the COVID-19 Pandemic: Parents’, Teachers’ and Students’ Perspectives [Volume 11, Issue 4, 2020, Pages 207-214]
  • Electronic Learning Factors Affecting a Medical Faculty’s Engagement in Virtual Learning Environments [Volume 11, Issue 4, 2020, Pages 256-264]
  • Emergency E-learning Webinar Technology: Developing Teacher Training Programs for Emergency Remote Teaching amid COVID-19 [Volume 11, Issue 3, 2020, Pages 200-203]
  • Emergency Remote Teaching Designing Quality E-Learning Environments for Emergency Remote Teaching in Coronavirus Crisis [Volume 11, Issue 2, 2020, Pages 135-137]
  • Emergency Remote Teaching The Unanticipated Educational Challenges of Developing Countries in Covid-19 Crisis: A Brief Report [Volume 11, Issue 2, 2020, Pages 130-134]
  • Emergency Remote Teaching Webinar Technology: Developing Teacher Training Programs for Emergency Remote Teaching amid COVID-19 [Volume 11, Issue 3, 2020, Pages 200-203]
  • Emojis Letter to the Editor: The Role of Emojis in E-Learning [Volume 11, Issue 3, 2020, Pages 204-205]
  • ERT Webinar Technology: Developing Teacher Training Programs for Emergency Remote Teaching amid COVID-19 [Volume 11, Issue 3, 2020, Pages 200-203]
  • Evaluate Proactive Teaching: Development and Validation of a Scale to Evaluate Constructivist Teaching in Higher Education [Volume 11, Issue 1, 2020, Pages 1-12]
  • Explorer Player Style Investigating the Components of Educational Game Design Based on Explorer Player Style: A Systematic Literature Review [Volume 11, Issue 3, 2020, Pages 139-152]

F

  • Face validity Validating the Persian Version of ICT Engagement Questionnaire [Volume 11, Issue 2, 2020, Pages 92-101]
  • Factor analysis Validating the Persian Version of ICT Engagement Questionnaire [Volume 11, Issue 2, 2020, Pages 92-101]
  • Flow An investigation into the Factors Affecting Perceived Enjoyment of Learning in Augmented Reality: A Path Analysis [Volume 11, Issue 4, 2020, Pages 224-235]

G

  • Game Student Engagement: Developing Self-Generated Game-Assisted Activities for Teaching and Learning Language for Medical Purposes [Volume 11, Issue 4, 2020, Pages 269-271]

H

  • Higher Education Proactive Teaching: Development and Validation of a Scale to Evaluate Constructivist Teaching in Higher Education [Volume 11, Issue 1, 2020, Pages 1-12]
  • Higher Education Factors Affecting the Instructional Application of Virtual Social Networks in Higher Education [Volume 11, Issue 3, 2020, Pages 180-190]
  • Higher Medical Education The Role and Influence of “Clip Thinking” on the Educational Process in Higher Medical Institutions [Volume 11, Issue 1, 2020, Pages 61-64]
  • Hospitalization Effectiveness of E-Learning among Hospitalized Elementary Students with Chronic Diseases [Volume 11, Issue 3, 2020, Pages 191-199]

I

  • ICT engagement Validating the Persian Version of ICT Engagement Questionnaire [Volume 11, Issue 2, 2020, Pages 92-101]
  • Instructors The Competencies Expected of Instructors in Massive Open Online Courses (MOOCs) [Volume 11, Issue 2, 2020, Pages 69-83]
  • Interactive white board The Effect of Online Interpretations via Interactive White Boards on Vocabulary Learning [Volume 11, Issue 1, 2020, Pages 37-45]
  • Interprofessional education Blended Teaching/Learning Approach in Medical Schools: Need of the Day in the 21st Century [Volume 11, Issue 4, 2020, Pages 265-268]
  • Intrinsic and extrinsic factors Factors Affecting a Medical Faculty’s Engagement in Virtual Learning Environments [Volume 11, Issue 4, 2020, Pages 256-264]
  • Isfahan University The Challenges of Implementing E-learning Courses in Iran’s Higher Education: A University Management Perspective [Volume 11, Issue 4, 2020, Pages 246-255]

K

  • Knowledge Designing a Virtual-Social Learning Environment for Awareness about Diabetes and Its Effectiveness on the Knowledge and Self-efficacy of Male Students’ Mothers [Volume 11, Issue 1, 2020, Pages 54-60]
  • Knowledge about diabetes Designing a Virtual-Social Learning Environment for Awareness about Diabetes and Its Effectiveness on the Knowledge and Self-efficacy of Male Students’ Mothers [Volume 11, Issue 1, 2020, Pages 54-60]

L

  • Labor Market Conditions The Effect of Labor Market Conditions on Enrollment Rate in Iran’s Distance Universities: A Case Study of Payame Noor University [Volume 11, Issue 3, 2020, Pages 153-161]
  • Learning Effectiveness of Applying Philosophy for Children (P4C) Teaching Approach in a Media Literacy Course [Volume 11, Issue 2, 2020, Pages 112-120]
  • Learning retention Comparing Two Forms of Spatial Contiguity Principle in Student Learning: 'Text Linked to Image' versus 'Text in Image Adjacency' [Volume 11, Issue 2, 2020, Pages 84-91]
  • Listening comprehension The Effects of Audio-Only and Audio-Video Materials on Listening Comprehension and Critical Thinking among Dental Students: A Focus Group Analysis [Volume 11, Issue 4, 2020, Pages 215-223]
  • LMP Student Engagement: Developing Self-Generated Game-Assisted Activities for Teaching and Learning Language for Medical Purposes [Volume 11, Issue 4, 2020, Pages 269-271]

M

  • MOOCs The Competencies Expected of Instructors in Massive Open Online Courses (MOOCs) [Volume 11, Issue 2, 2020, Pages 69-83]
  • Multimedia content Comparing Two Forms of Spatial Contiguity Principle in Student Learning: 'Text Linked to Image' versus 'Text in Image Adjacency' [Volume 11, Issue 2, 2020, Pages 84-91]

N

  • Need for cognition An investigation into the Factors Affecting Perceived Enjoyment of Learning in Augmented Reality: A Path Analysis [Volume 11, Issue 4, 2020, Pages 224-235]
  • Non-verbal cues Letter to the Editor: The Role of Emojis in E-Learning [Volume 11, Issue 3, 2020, Pages 204-205]

O

  • Online learning environments Validity Evidence for a Persian Version of the Online Self-Regulated Learning Questionnaire [Volume 11, Issue 1, 2020, Pages 13-24]
  • Online teaching Blended Teaching/Learning Approach in Medical Schools: Need of the Day in the 21st Century [Volume 11, Issue 4, 2020, Pages 265-268]
  • Online Training Webinar Technology: Developing Teacher Training Programs for Emergency Remote Teaching amid COVID-19 [Volume 11, Issue 3, 2020, Pages 200-203]

P

  • Paramedical Students Investigating the Tendency towards Research in the Curriculum of a Paramedical Faculty [Volume 11, Issue 2, 2020, Pages 121-129]
  • Payame Noor University The Effect of Labor Market Conditions on Enrollment Rate in Iran’s Distance Universities: A Case Study of Payame Noor University [Volume 11, Issue 3, 2020, Pages 153-161]
  • Payam Noor University Efficiency Evaluation of E-Learning Courses at Payam Noor University Based on Learning Usability Criteria [Volume 11, Issue 4, 2020, Pages 236-245]
  • Perceived enjoyment An investigation into the Factors Affecting Perceived Enjoyment of Learning in Augmented Reality: A Path Analysis [Volume 11, Issue 4, 2020, Pages 224-235]
  • Philosophical Mentality Effectiveness of Applying Philosophy for Children (P4C) Teaching Approach in a Media Literacy Course [Volume 11, Issue 2, 2020, Pages 112-120]
  • Philosophy for Children Effectiveness of Applying Philosophy for Children (P4C) Teaching Approach in a Media Literacy Course [Volume 11, Issue 2, 2020, Pages 112-120]
  • Pictorial materials The Effect of Online Interpretations via Interactive White Boards on Vocabulary Learning [Volume 11, Issue 1, 2020, Pages 37-45]
  • Pregnancy education Quality Assessment of Persian Educational Websites for Pregnant Mothers: A Descriptive Study [Volume 11, Issue 1, 2020, Pages 25-36]
  • Proactive teaching Proactive Teaching: Development and Validation of a Scale to Evaluate Constructivist Teaching in Higher Education [Volume 11, Issue 1, 2020, Pages 1-12]
  • Problem based learning Investigating the Effects of Problem-Based Learning in a Virtual Group on Collaborative Learning, Social Presence and Student Satisfaction in Surgery Department [Volume 11, Issue 2, 2020, Pages 102-111]
  • Professional Development Webinar Technology: Developing Teacher Training Programs for Emergency Remote Teaching amid COVID-19 [Volume 11, Issue 3, 2020, Pages 200-203]

R

  • Remote Learning The Unanticipated Educational Challenges of Developing Countries in Covid-19 Crisis: A Brief Report [Volume 11, Issue 2, 2020, Pages 130-134]
  • Remote Teaching The Unanticipated Educational Challenges of Developing Countries in Covid-19 Crisis: A Brief Report [Volume 11, Issue 2, 2020, Pages 130-134]
  • Research Investigating the Tendency towards Research in the Curriculum of a Paramedical Faculty [Volume 11, Issue 2, 2020, Pages 121-129]

S

  • Satisfaction Investigating the Effects of Problem-Based Learning in a Virtual Group on Collaborative Learning, Social Presence and Student Satisfaction in Surgery Department [Volume 11, Issue 2, 2020, Pages 102-111]
  • Scale Proactive Teaching: Development and Validation of a Scale to Evaluate Constructivist Teaching in Higher Education [Volume 11, Issue 1, 2020, Pages 1-12]
  • Self-efficacy Designing a Virtual-Social Learning Environment for Awareness about Diabetes and Its Effectiveness on the Knowledge and Self-efficacy of Male Students’ Mothers [Volume 11, Issue 1, 2020, Pages 54-60]
  • Self-efficacy An investigation into the Factors Affecting Perceived Enjoyment of Learning in Augmented Reality: A Path Analysis [Volume 11, Issue 4, 2020, Pages 224-235]
  • Self-Generated Activities Student Engagement: Developing Self-Generated Game-Assisted Activities for Teaching and Learning Language for Medical Purposes [Volume 11, Issue 4, 2020, Pages 269-271]
  • Self-regulated learning Validity Evidence for a Persian Version of the Online Self-Regulated Learning Questionnaire [Volume 11, Issue 1, 2020, Pages 13-24]
  • Smart Schools Investigating the Application of Technology Acceptance Model in Smart Schools [Volume 11, Issue 3, 2020, Pages 162-169]
  • Social networking Factors Affecting the Instructional Application of Virtual Social Networks in Higher Education [Volume 11, Issue 3, 2020, Pages 180-190]
  • Social Networks Investigating the Effects of Problem-Based Learning in a Virtual Group on Collaborative Learning, Social Presence and Student Satisfaction in Surgery Department [Volume 11, Issue 2, 2020, Pages 102-111]
  • Social Networks Letter to the Editor: The Role of Emojis in E-Learning [Volume 11, Issue 3, 2020, Pages 204-205]
  • Social Networks Effectiveness of E-Curriculum in Social Networks during the COVID-19 Pandemic: Parents’, Teachers’ and Students’ Perspectives [Volume 11, Issue 4, 2020, Pages 207-214]
  • Solutions The Challenges of Implementing E-learning Courses in Iran’s Higher Education: A University Management Perspective [Volume 11, Issue 4, 2020, Pages 246-255]
  • Spatial contiguity Comparing Two Forms of Spatial Contiguity Principle in Student Learning: 'Text Linked to Image' versus 'Text in Image Adjacency' [Volume 11, Issue 2, 2020, Pages 84-91]
  • Staff Development Blended Teaching/Learning Approach in Medical Schools: Need of the Day in the 21st Century [Volume 11, Issue 4, 2020, Pages 265-268]
  • Student Engagement Student Engagement: Developing Self-Generated Game-Assisted Activities for Teaching and Learning Language for Medical Purposes [Volume 11, Issue 4, 2020, Pages 269-271]

T

  • TAM model Investigating the Application of Technology Acceptance Model in Smart Schools [Volume 11, Issue 3, 2020, Pages 162-169]
  • Technology Acceptance Investigating the Application of Technology Acceptance Model in Smart Schools [Volume 11, Issue 3, 2020, Pages 162-169]
  • Technology Acceptance Model Factors Affecting the Instructional Application of Virtual Social Networks in Higher Education [Volume 11, Issue 3, 2020, Pages 180-190]
  • Text in image adjacency Comparing Two Forms of Spatial Contiguity Principle in Student Learning: 'Text Linked to Image' versus 'Text in Image Adjacency' [Volume 11, Issue 2, 2020, Pages 84-91]
  • Text linked to image Comparing Two Forms of Spatial Contiguity Principle in Student Learning: 'Text Linked to Image' versus 'Text in Image Adjacency' [Volume 11, Issue 2, 2020, Pages 84-91]
  • Thinking and Media Literacy Effectiveness of Applying Philosophy for Children (P4C) Teaching Approach in a Media Literacy Course [Volume 11, Issue 2, 2020, Pages 112-120]

U

  • Usability Efficiency Evaluation of E-Learning Courses at Payam Noor University Based on Learning Usability Criteria [Volume 11, Issue 4, 2020, Pages 236-245]

V

  • Validation Proactive Teaching: Development and Validation of a Scale to Evaluate Constructivist Teaching in Higher Education [Volume 11, Issue 1, 2020, Pages 1-12]
  • Validity Validity Evidence for a Persian Version of the Online Self-Regulated Learning Questionnaire [Volume 11, Issue 1, 2020, Pages 13-24]
  • Video interpretation The Effect of Online Interpretations via Interactive White Boards on Vocabulary Learning [Volume 11, Issue 1, 2020, Pages 37-45]
  • Virtual Education Factors Affecting the Instructional Application of Virtual Social Networks in Higher Education [Volume 11, Issue 3, 2020, Pages 180-190]
  • Virtual Learning Webinar Technology: Developing Teacher Training Programs for Emergency Remote Teaching amid COVID-19 [Volume 11, Issue 3, 2020, Pages 200-203]
  • Virtual learning environment Factors Affecting a Medical Faculty’s Engagement in Virtual Learning Environments [Volume 11, Issue 4, 2020, Pages 256-264]
  • Virtual social-vocational educational environment Designing a Virtual-Social Learning Environment for Awareness about Diabetes and Its Effectiveness on the Knowledge and Self-efficacy of Male Students’ Mothers [Volume 11, Issue 1, 2020, Pages 54-60]
  • Virtual System Investigating the Effects of Problem-Based Learning in a Virtual Group on Collaborative Learning, Social Presence and Student Satisfaction in Surgery Department [Volume 11, Issue 2, 2020, Pages 102-111]
  • Vocational Education & Training A Comparison Between the Effectiveness of E-learning and Blended Learning in Industrial Training [Volume 11, Issue 1, 2020, Pages 46-53]

W

  • Webinar-Based Training Webinar Technology: Developing Teacher Training Programs for Emergency Remote Teaching amid COVID-19 [Volume 11, Issue 3, 2020, Pages 200-203]
  • Webinars Webinar Technology: Developing Teacher Training Programs for Emergency Remote Teaching amid COVID-19 [Volume 11, Issue 3, 2020, Pages 200-203]
  • Webinar Technology Webinar Technology: Developing Teacher Training Programs for Emergency Remote Teaching amid COVID-19 [Volume 11, Issue 3, 2020, Pages 200-203]
  • WebMedQual Scale Quality Assessment of Persian Educational Websites for Pregnant Mothers: A Descriptive Study [Volume 11, Issue 1, 2020, Pages 25-36]
  • Website Quality Assessment of Persian Educational Websites for Pregnant Mothers: A Descriptive Study [Volume 11, Issue 1, 2020, Pages 25-36]
  • Workplace Learning A Comparison Between the Effectiveness of E-learning and Blended Learning in Industrial Training [Volume 11, Issue 1, 2020, Pages 46-53]