The Effectiveness of a Program Based on Sensory Activities to Develop some Basic Scientific Processes in Kindergarten Child

Document Type : Original Article

Author

Kindergarten Department Faculty of Humanities, Al-Azhar University, Egypt.

10.21608/jsre.2024.289841.1691

Abstract

The research aimed to develop some basic science processes for kindergarten children, and to verify the effectiveness of the program based on using sensory activities to develop some basic science processes for kindergarten children. The research used the quasi-experimental approach, and the research sample consisted of (60) kindergarten boys, both male and female, at the age of ( 4-6) years divided into two groups: A control group consisting of (30) male and female children, and an experimental group consisting of (30) kindergarten male and female children. The research used a scale for basic science operations illustrated for kindergarten children (prepared by the researcher), and a note card for kindergarten teachers regarding basic science processes for kindergarten children (prepared by / The researcher), the program based on sensory activities (prepared by the researcher). The most prominent results of the research were: the presence of statistically significant differences between the average scores of the children of the control and experimental groups on the basic science operations scale illustrated for kindergarten children after applying the program in favor of the experimental group. Basic science in favor of the post measurement, there are no statistically significant differences between the average scores of the post and follow-up measurements for the children of the experimental group on the basic science processes scale

Keywords

Main Subjects


children at pre-primary level in Nigeria. International Online Journal of primary Education10(1), 106-118.‏
Anghel, M. (2019). The Influence of Sensory Systems in Motor Development to the Preschool Child. Bulletin of the Transilvania University of Braşov. Series IX: Sciences of Human Kinetics, 189-194.‏
Booth, J & Siegler, R. (2008). Numerical magnitude representations influence arithmetic learning. Child development79(4), 1016-1031.‏
 Bulunuz,M,(2013). Designing Science Learning in the First Years of Schooling. An intervention study with sequenced learning material on the topic of ‘floating and sinking. International Journal of Since Education. Volume 36. Issue 10. PP 1751- 1771. '
 Caine, R., Caine, G., McClintic, C., & Klimek, K. (2015). The brain/mind principles Wheat.Retrieved May,from http//cainlearing.com/pwhee.
          Chusnul Mualli, Moh. Rofiki, Feriska listrianti, Miri Jufria Vinori (2022). Concentration of children's learning in motor sensory play management development frame work, Journal Obsesi: Journal Pendidikan Anak Usia Dini, 6(5)، 3807-3816.
Dini, J. (2022). Concentration of Children's Learning in Motor-Sensory Play Management Development Framework. Jurnal Obsesi: Jurnal Pendidikan Anak Usia Dini6(5), 3807-3816.‏
Fisher. V., Oliver, A. (2015). Sensory play, combe pre_school. Retrived from: http://the imagintiotree.com
Griffin, S. (2007). Early intervention for children at risk of developing mathematical learning difficulties.‏
Jackman, H. (2012). Early Education Curriculum, A Child’s Connection to The World (5th ed.). Belmont, CA: Wadsworth, Cengage Learning.
  Jordan, N., Dyson, N., & Glutting, J. (2011). Developing Number Sense in Kindergartners at Risk for Learning Difficulties in Mathematics. Society for Research on Educational Effectiveness.‏ , 1-11. https://eric.ed.gov/?id=ED528836
Lersilp, S., Putthinoi, S., & Chaimaha, N. (2021). Learning environments of preschool children who have different learning styles and sensory behaviors. Child Care in Practice, 1-20.‏ , on line: http: //doi.org/10.1080/13575279.20
Loncour, K. (2004). Process skills for life science:
Martin, D. J. (2009). Elementary Science Methods: A Constructivist Approach (5th ed.). Belmont, CA: Wadsworth, Cengage Learning
Matos, A., Rocha, T., Cabral, L., & Bessa, M. (2015). Multi-sensory storytelling to support learning for people with intellectual disability: an exploratory didactic study. Procedia computer science67, 12-18.
Mulyeni, T., Jamaris, M., & Supriyati, Y. (2019). Improving basic science process skills through inquiry-based approach in learning science for early elementary students. Journal of Turkish Science Education16(2), 187-201.‏
Mutlu, M., & Temiz, B. (2013). Science process skills of students having field dependent and field independent cognitive styles. Educational Research and Reviews8(11), 766.‏
piad/pslsl_training_hammond.pdf 
   Praet, M., & Desoete, A. (2019). A Pilot Study about the Effect and Sustainability of Early Interventions for Children with Early Mathematical Difficulties in Kindergarten. Learning Disabilities: A Contemporary Journal17(1), 29-40.‏
Rezba, R., Sprague, C., McDonnough, J. & Matkins, J. (2007). Learning and assessing science process skills. Iova: Kendall, Hunt Publishing Company.
Shannonhouse, A. K. (2012). The effects of physical activity on academic achievement in kindergarten aged children (Doctoral dissertation, University of Pittsburgh).‏
Stacy, D. Thompson & Jill,M. Raisor (2013). Individualizing in early childhood: The what, why, and How of differentiated approaches, the National Association for the Education of young children, Articleis Available on line at: www.naeyc.orh/member
Tekercı, H., & Kandır, A. (2017). Effects of the sense-based science education program on scientific process skills of children aged 60–66 months. Eurasian Journal of Educational Research17(68), 239-254.‏
Thompson, S., & Raisor, J. (2013). Meeting the sensory needs of young children. YC Young Children68(2), 34.‏
Tomchek, S., Little, L., & Dunn, W. (2015). Sensory pattern contributions to developmental performance in children with autism spectrum disorder. The American Journal of Occupational Therapy69(5), 6905185040p1-6905185040p10.‏
Training guide.Retrieved from.
Vaisarova, J., & Reynolds, A. J. (2022). Is more child-initiated always better? Exploring relations between child-initiated instruction and preschoolers’ school readiness. Educational assessment, evaluation and accountability34(2), 195-226.‏
Wood & Hall,E. (2005). Wondering with Children. The Importance of Observation in Early Education، 7(2)، Amherst، Massachusetts.
Yılmaz, G., İlkörücü, Ş., & Çepni, S. (2018). The effects of parent-involved science activities on basic science process skills of the children in the age group of 5-6. Pegem Journal of Education and Instruction8(4), 879-903.‏
Translation of Arabic References :
Abu Saleh, Hoda Othman. (2017). The effect of the Montessori method on improving the listening and speaking skills of kindergarten children. Dar Amjad for Publishing and Distribution.
 Abu Galala, Subhi Hamdan. (2012). Developing higher-order thinking skills and creative thinking. Qatar National Committee for Education, Culture and Science.
 Abu Haram, Shadia Ismail Abdel Karim. (2019). The effectiveness of a proposed program based on graded activities to develop scientific concepts and basic science processes among kindergarten children [Unpublished master’s thesis]. Sohag University.
 Abu Sarhan, Attia Odeh. (2017). Teaching methods of social and national education. Dar Al Khaleej for Publishing and Distribution.
Ahmed, Shaima Al-Maghawri. (2019). Planning sensory and computer activities to develop some life science concepts and skills for kindergarten children. Journal of Educational and Social Studies, 25(2), 213-236.
6- Ahmed, Naglaa Fathi Sayed. (2014). The effectiveness of using manual activities in providing kindergarten children with concepts of reasoning and some mathematical concepts in light of the theory of multiple intelligences. Journal of Mathematics Education, 17(5), 220-226.
7- Al-Sawy, Najwa. (2001). The impact of a program for developing science process skills among children in kindergarten [Unpublished doctoral dissertation]. Ain-Shams University.
 Iskandar, Marian Khalaf Kamal. (2017). The effectiveness of designing educational activities based on role-playing and discovery strategies for developing the natural intelligence of kindergarten children [Unpublished master’s thesis]. Cairo University.
 Elias, Asmaa Girgis, and Ali, Salwa Muhammad. (2015). Modern trends in designing and developing curricula in kindergartens. Dar Al-Assar Al-Alami for Publishing and Distribution.
 Amin, Abeer Siddiq. (2018). The effectiveness of a program based on active learning strategies in developing some scientific concepts and science processes for the hearing-impaired kindergarten child. Scientific Journal of Assiut University, (6), 68- 152
 Badr al-Din, Khadija. (2014). The effectiveness of a program for developing numerical sense among children with learning difficulties in the pre-school stage. Specialized Educational Journal, 3(7), 73-88.
- Boutros, Hafez Boutros. (2008). Developing scientific and mathematical concepts for kindergarten children. Dar Al Masirah.
Boutros, Hafez Boutros. (2017). Developing scientific concepts and skills for pre-school children (11th ed.). Dar Al Masirah.
 Al-Bushi, Nancy Al-Sayed Ali Taha. (2018). A proposed program for using life applications to develop physical concepts and basic science processes. Journal of Education and Child Culture, Faculty of Early Childhood Education, Minya University, 1(13), 311-336.
 Tawfiq, Asmaa Fathi. (2014). The role of science and discovery in developing some habits of mind among kindergarten children. Journal of Educational Sciences, 22(2), 221-278.
 Thabet, Mary Wahba. (2023). The effectiveness of an animation program in developing basic science processes for kindergarten children at risk of learning difficulties. Journal of Education and Child Culture, Faculty of Early Childhood Education, Minya University, 28(1), 207-240.
 Gad, Mona Muhammad. (2000). Kindergarten curricula “types - planning - implementation - evaluation”. Cairo University.
Al-Jarim, Ali, and Amin, Mustafa. (2020). Psychology and its effects on education. Arab Press Agency.
 Al-Jarwani, Hala Ibrahim, and Ibrahim, Inshrah. (2010). Preparing the child for kindergarten. The Egyptian Lebanese House.
 Johnston, Jane and Gray, Adelaide. (2006). Enriching scientific education in the early stages of school. Dar Al-Farouk.
Habib, Wissam Abdel Hamid. (2022). A program based on interactive sensory activities to develop preventive awareness among nursery children (3-4 years old). Journal of Childhood and Education, 2(52) 18- 163.
Al-Hariri, Rafidah Hassan. (2013). Contemporary issues in raising a pre-school child. Dar Al-Manhaj for Publishing and Distribution.
 Hassan, Hana Hassan Othman. (2018). A training program to develop basic science processes for kindergarten teachers [Unpublished doctoral dissertation]. Damanhour University.
 Hatabiya, Abdullah Muhammad. (2011). Learning Science for All (3rd ed.). Dar Al Masirah.
25- Hamza, Muhammad Abdel Wahab, and Al-Suwaih, Ibtisam Ramadan. The effect of a program based on sensory activities in developing some mathematical thinking skills for kindergarten children in Amman. Al-Quds Open Journal for Educational and Psychological Research and Studies, 9(26), 18-33.
Al-Hila, Muhammad. (2003). Educational games and their production techniques, psychologically, educationally and practically. Dar Al Masirah for Publishing and Distribution.
 Al-Kharasat, Samir Abdel Salem. (2009). Teaching strategies in physics to develop science processes. House of Culture.
Al-Khazraji, Salim Ibrahim. (2022). Using the educational scaffolding strategy to form some physics concepts and develop the scientific sense of kindergarten children. Journal of the Faculty of Kindergarten at Port Said University, (17), 111-189.
 Al-Khafaf, Iman. (2010). Play modern teaching strategies. Dar Al-Minhaj for Publishing and Distribution.
 Khalaf, Amal. (2014). Preparing programs for kindergarten children. The world of books.
 Khalil, Muhammad. (2009). Scientific thinking and values ​​of progress in the family. Dar Al Ulum for Publishing and Distribution.
32- Khoshnaw, Hatem, and Saleh, Shirwan. (2015). The effect of a proposed educational program using free sensory activities on the development of some physical and sensory abilities and social development for kindergarten children. Journal of Human Sciences, 19(1), 54-58.
33- Daraz, Aya Abdul Hamid Suleiman. (2021). A program based on the SCAMPER strategy to develop some systems thinking skills and basic science processes for kindergarten children [Unpublished doctoral dissertation]. Al Azhar university.
- Al-Daluli, Dhawiya Milad Misbah. (2013). The effectiveness of a proposed strategy based on constructivism for teaching science in developing scientific concepts, science process skills, and laboratory skills among students in the second stage of basic education in Libya [Unpublished doctoral dissertation]. Cairo University.
 Zaghloul, Atef Hamed. (2010). Guide to early childhood education (nursery, kindergarten, first grade). Misr Al Arabiya for Publishing and Distribution.
 Zaitoun, Ayesh. (2008). The extent of acquisition of science processes among basic stage students in Jordan and its relationship to the variables of academic grade and academic achievement. Journal of Educational Science Studies, Jordan, 35(2), 372-392.
Zaitoun, Ayesh Mahmoud. (2013). Methods of teaching science (7th ed.). Dar Al Shorouk for Publishing and Distribution.
 Zaitoun, Kamal Abdel Hamid. (2002). Teaching science for understanding (a constructivist view). The world of books.
 Zaitoun, Kamal Abdel Hamid. (2009). Science processes and scientific education, the scientific framework for evaluating science in light of international studies of science and mathematics. The world of books.
 Zaitoun, Kamal Abdel Hamid. (2004). Science teaching methods. Dar Al Shorouk for Publishing and Distribution.
 Al-Zyoud, Yazan Mahmoud Mualla. (2021). A program based on problem-solving strategies to develop the kindergarten child’s deduction and interpretation skills. Scientific Journal of the Faculty of Early Childhood Education at Mansoura University, 8(1), 375- 425.
Al-Saadani, Abd al-Rahman Muhammad, and Odeh, Thanaa Maliji al-Sayyid. (2018). Introduction to teaching science. Modern Book House.
 Salama, Sarah Al-Ahmadi Muhammad. (2020). The effectiveness of using cooking experiences in developing the concept of measurement among kindergarten children. Scientific Journal of the Faculty of Early Childhood Education at Mansoura University, 7 (2), 87- 138.
 Suleiman, Tahani Muhammad. (2015). An activity program based on scientific stations to provide kindergarten children with some scientific concepts and science processes. Journal of Scientific Education at Zagazig University, 18(2), 1-45.
 Smith, Jennifer. (2016). Science Education for the Early Childhood Years (Translated by Youssef Tepes; 2nd ed.). Eligibility for publication and distribution.
 Shaheen, Shaima Fahmy Ibrahim. (2013). The effectiveness of the circular house strategy in teaching science on acquiring scientific concepts and developing some science process skills among primary school students [Unpublished master’s thesis]. Banha university.
Al-Shabrawi, Abdel Nasser Salama. (2014). Professionalism in planning children's programs. Joanna Publishing and Distribution.
48- Sharif, Mr. Abdul Qader. (2014). Entrance to kindergarten. Dar Al-Jawhara for Publishing and Distribution.
49- Al-Sharif, Kawthar Abdel Rahim Shehab. (2010). Activating the systemic approach in developing basic science skills and multiple intelligences among children in kindergarten. Educational Journal, 1(28), 285-309.
 Shaaban, Fatima Ashour Tawfiq, and Youssef, Fayza Ahmed Ali. (2018). The effectiveness of using sensory and electronic story activities in imparting nutritional culture to kindergarten children. Arab Journal of Science and Research Publishing, 2(10), 49-68.
Shawaheen, good. (2005). Developing thinking skills in learning science. Dar Al Amal for Publishing and Distribution.
 Talaba, Ibtihaj Mahmoud. (2010). Activities in kindergarten. Dar Al-Zahra.
 Taha, Radi Abdel Majeed. (2015). Raising children and their culture in light of contemporary changes. Dar Al-Manhaj for Publishing and Distribution, Amman.
Al-Titi, Muhammad Hamad. (2004). Mental processes of positive thinking: skills and applications of “modern educational systems”. House of Systems.
 Abdel Jawad, Wafa Rashad Rawi. (2013). The effect of using a program based on brain-based learning in developing basic thinking skills in a kindergarten child. Journal of the Arab Educators Association, 4(38), 49-76.
 Abdel Hamid, Tasneem Hussein. (2006). The effectiveness of the cooperative learning strategy in developing some basic science processes for kindergarten children [Unpublished master’s thesis]. Cairo University.
Abdel Khaleq, Fouad Abdel Khaleq. (2011). Studies on curricula and methods of education in kindergartens. (3rd ed.). Al-Mutanabbi Library.
 Abdel Ati, Nasiba Jamal. (2017). The effect of sensory training on developing some concepts of cosmic physics and thinking skills among kindergarten children. The Second International Conference: Sustainable Development of the Arab Child as Foundations for Change in the Third Millennium - Reality and Challenges, Faculty of Kindergarten, Mansoura University.
 Abdel Aziz, Saeed. (2013). Teaching thinking and skills, exercises and applications (3rd ed.). House of Culture for Publishing and Distribution.
 Abdel Fattah, Azza Khalil. (2006). Curricula for pre-school children. Dar Al-Fikr Al-Arabi.
61- Abdel Fattah, Azza Khalil. (2009). Scientific and mathematical concepts and skills in early childhood. Dar Al-Fikr Al-Arabi.
 Abdel Fattah, Azza Khalil. (2012). Activities in kindergarten. Dar Al-Fikr Al-Arabi.
 Abdel Fattah, Nawal. (2005). The impact of metacognitive strategies on developing scientific thinking and attitudes toward science among first-year middle school students. Journal of Scientific Education, (8) 22-44.
 Abdullah, Azza Shadeed Muhammad. (2016). The effectiveness of scientific activities based on scientific experiments in developing intelligence among kindergarten children. College of Education Journal, 26(2), 419-489.
 Abdel Moneim, Suhair Atef Abdel Qader. (2022). The effectiveness of a program using the educational scaffolding strategy to develop some life science concepts and basic science processes among kindergarten children. Scientific Journal of the Faculty of Early Childhood Education in Port Said, 24(2), 637-713.
Abdul Wahab, Akram. (2017). The effectiveness of sensory activities in developing some scientific concepts among kindergarten children in Jordan [Unpublished master’s thesis]. Al-Isra Private University.
 Al-Attal, Hosni. (2012). The effectiveness of a proposed program based on communication in developing some mathematical thinking skills among seventh grade students [Unpublished master’s thesis]. Islamic University of Gaza.
 Al-Adwan, Ahlam Hassan (2018). The effect of using play activities in developing scientific thinking among pre-school children aged (5-6) years in the capital Amman Governorate, Dirasat: Educational Sciences
 Arqoub, Hamdi Shehata, Wawda, Jihan Mahmoud, Taha, Rehab Muhammad, and Ahmed, Najla.
 Asalia, Kawthar. (2009). Down syndrome child. House of Serenity.
 Asiri, Amani bint Muhammad Ali Al Mani. (2015). Employing kindergarten teachers, the research and discovery pillar in developing scientific thinking skills [Unpublished master’s thesis]. Journal of the Modern Education Association.7(25), 39-86.
Atallah, Michel Kamel. (2010). Methods and methods of teaching science. Dar Al Masirah.
 Atio, Muhammad Naguib. (2006). Methods of teaching science between theory and application. Al Rushd Library.
 Alwan, Rania, Al-Sayed, Sabah, Tharwat, and Rehab Abdel Aziz. (2018). The effect of using educational electronic games on developing mathematical concepts and innovative thinking among pre-school children. Arab Journal of Educational and Psychological Sciences, (5), 1-26.
 Ali, Zainab Ali Muhammad. (2014). The effectiveness of using the puzzles approach in teaching the field of science to develop some basic science processes among kindergarten children. Educational Journal at Sohag University, (35), 331.
Ali, Saeed Abdel Moez. (2012). The effectiveness of the strategy of learning through play and discovery in developing some basic science processes for kindergarten children. Journal of the Faculty of Education at Helwan University, 18(2), 297-336.
 Ali, Muhammad. (2002). Special education programmes, curricula and teaching methods. Dar Safaa for Publishing and Distribution.
 Al-Olyani, Muhammad Fayez Muhammad. (2013). The effectiveness of the generative learning model in achieving science and developing science process skills among primary school students in the Kingdom of Saudi Arabia [Unpublished master’s thesis]. Cairo University.
 Al-Ayasrah, Ahmed Hassan Ali. (2015). Developing a tool to measure science learning among kindergarten children and applying it to a Jordanian sample. Al-Mishkat Journal of Humanities and Social Sciences at the College of Educational Sciences, 2(1), 153-177.
 Faraj, Ahlam Qutb. (2021). The effectiveness of a program based on sensory and digital activities in developing some geographical concepts and tourism awareness among kindergarten children. Educational Journal, Faculty of Education, Sohag University, 2(91), 625-699.
 Fahmy, Atef Adly (2005). The effectiveness of using guided discovery in developing basic science process skills and scientific interests among kindergarten children. Egyptian Journal of Scientific Education, 8(4), 37-81.
 Al-Qaddah, Amal Muhammad. (2001). The effectiveness of a proposed program for developing basic science process skills among kindergarten children [Unpublished doctoral dissertation]. Mansoura University.
 Al-Qaddah, Amal Muhammad. (2013). The effectiveness of a proposed program based on manual therapy in developing kindergarten children’s mathematical concepts and their attitudes toward them. Childhood Journal, Faculty of Kindergarten, Cairo University, 1(13), 7-66
 Qatami, Youssef. (2016). Modern trends in child rearing. United Arab Company for Marketing and Supplies.
 Kamel, Jamal. (2016) Developing the number sense skills of a kindergarten child in light of a program based on the gamification method. Journal of the Faculty of Kindergarten at Port Said University, (9), 15-111.
Kamel, Suhair. (2014). Developing the artistic and motor skills of kindergarten children. Al Rushd Library.
 Karar, Heba Jamal Muhammad. (2014). The effectiveness of the discovery learning strategy in developing scientific concepts and skills among kindergarten children [Unpublished master’s thesis]. Aswan University.
 Kojak, Kawthar. (2006). Modern trends in curricula and teaching methods (3rd ed.). The world of books.
89- Leswood, Neville Bent. (2009). Education through play (translated by Khaled Al-Omari). Dar Al-Farouk for Publishing and Distribution.
 Muhammad, Fatima Asim Abdel Jalil. (2012). The effectiveness of using scientific activities in developing science imagination in kindergarten. Reading and Knowledge Magazine. (134), 123-144.
 Marai, Tawfiq, and Al-Haila, Muhammad. (2002). Modern educational curricula, their concepts, elements, foundations, and processes. Dar Al Masirah.
 Massad, Ziyad. (2008). Teaching thinking. www.drnosud.com
Al-Maghrabi, Randa Muhammad, and Hegazy, Doaa Faisal. (2022). The effectiveness of developing the discovery corner in developing some basic science processes among preschool children. Scientific Journal of the Faculty of Early Childhood Education - Mansoura University, 9 (2), 259.
 Mansi, Abeer Mahmoud; Moawad, Arwa Samir; And Al-Sherbini, Iman Ahmed Al-Najdi. (2022). A program based on the SCAMPER model in developing basic science processes in kindergarten children. Scientific Journal of the Faculty of Early Childhood Education in Port Said, (25), 257- 329.
 Mansour, Nabila Nabil. (2022). The effectiveness of using the integrated experience approach in developing the concept of classification among kindergarten children. Scientific Journal of the College of Early Childhood Education, 8(3), 349-378.
 Musa, Samia. (2007). The effectiveness of proposed sensory activities as an introduction to kindergarten children learning some scientific concepts. Journal of Reading and Knowledge at Ain Shams University, (70), 90-114.
 Al-Nashif, Huda. (2013). Kindergarten, revised edition. Dar Al-Fikr Al-Arabi.
Al-Nashif, Huda. (2008). Designing educational programs for pre-school children. Modern Book House.
Nabil, Iman Muhammad. (2013). An activities program based on discovery learning to develop some mathematical and scientific concepts among pre-school children. Journal of the College of Education in Ismailia, (25), 99-126.
100- Al-Najhi, Fawzia Mahmoud. (2005). Modern trends in the development of thinking and creativity How your child thinks. Modern Book House.
 Al-Najdi, Ahmed Abdel Rahman and others. (2002). Introduction to science teaching. Dar Al-Fikr Al-Arabi.
 Hashem, Sherine Abbas, and Afifi, Yousry Afifi. (2006). Scientific activities and developing thinking skills for kindergarten children. Dar Al-Fikr Al-Arabi.
 Al-Huwaidi, Zaid. (2010). Methods of teaching science at the basic stage (2nd edition). University Book House.
 Ward, Helen et al. (2008). The art of teaching science in the primary stage (translated by Khaled Al-Amiri). Dar Al-Farouk.
 Ministry of Education. (2015). Early learning and developmental standards. Kingdom of Saudi Arabia.
 Al-Wahaibi, Ilham bint Saleh bin Muhammad. (2018). The degree of availability of basic science processes in the teacher’s guide for the self-learning curriculum for kindergarten. Journal of the Faculty of Education at Kafrelsheikh University, (18), 527-562.
Al-Yami, Nisreen Ali Zayed. (2020). The effectiveness of using educational electronic games in developing basic science processes among kindergarten children. International Journal of Educational and Psychological Sciences, (35), 466-516.