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The term represents an integral element of each subject and forms the basis for the development of knowledge and mastery of knowledge acquired through the development of science. The school and the course book should enable students to adopt a system of scientific concepts from a certain field. This work deals with the analysis of the concepts of nature in the coursebooks of Nature and Society for the fourth grade of primary school, published by the publishers: Klett, New logos, and Bigz schooling. The research provides answers to the following questions: Are the concepts of nature explicitly represented in coursebooks? Do complete and incomplete logical definitions of the concepts of nature dominate in the coursebooks of Nature and Society? Is there a dominance of complete and incomplete logical definitions of different publishers and by the dominance of complete and incomplete logical definitions of the concepts of nature? Based on the results of research on the definitions of the concepts of nature in the coursebooks of Nature and Society for the fourth grade, it can be concluded that the coursebooks of Klett, New logos, and Bigz schooling have a very large number of undefined concepts of nature, greater than the number of definitions. Most textbooks about nature are in the textbook published by Klett (198 terms), followed by the textbook published by New Logos (174 terms), while the least notions about nature are found in the textbook published by Bigz schooling (142 terms). The most accurate definitions are in the textbook published by Klett (86 definitions), followed by the textbook published by New Logos (83 definitions), while the least definitions of nature are found in the textbook Bigz schooling (59 definitions). All of this points to the need for detailed changes to the analyzed nature and society textbooks from the publishing houses Klett, New logos, and Bigz schooling. This problem will certainly be the subject of academic discussion and some future research.

Research to date has shown that teacher teamwork results in higher motivation among students and higher quality knowledge, and also facilitates the sharing of professional experiences and stimulates teachers' creativity and their openness to change. Team forming and development depend on multiple factors, particularly on the individual and group traits of team members. This paper examines teachers' attitudes as an individual factor significant for their inclination for team teaching, and the aim of the study presented in the paper was to study teachers' attitudes to teamwork. The sample consisted of 240 teachers from fifteen elementary schools in Belgrade. Factor analysis has singled out three factors around which teachers' attitudes are grouped: a) teaching; b) team and individual development; and c) professional challenge. The study has shown that overall, teachers have a positive attitude to teamwork because it is conducive to a stimulating environment for work and learning, and also provides an opportunity for teachers' personal and professional development. Significant differences in the perception of teamwork have been noted among lower-grade teachers depending on their years of service and the extent to which they have been engaged in team teaching.

Ways of achieving individualization of the learning process are one of the most important issues of modern didactics. They represent a new approach to creating modern systems of teaching. There is a growing discussion about developmental teaching that can be characterized as a model of individualized teaching. This is the answer to the classical organization of teaching in a class-lecture system in which teaching content, teaching methods, learning styles and all other working conditions are the same for all students. Therefore, the creation of a modern Science & Social Studies textbook which should meet the requirements of modern teaching has a great social importance and requires joint efforts of theoreticians, researchers and practitioners. When the textbooks is well-designed, we can expect improved student activity in didactic and methodological sense, development of his individuality and creativity, as well as positive influence on his self-formation and self-actualization. Starting from the notion of individualization, the textbook as an assumed scenario of the learning and teaching process, the authors determine the goal of the research: to examine the presence of values of individualization in Science & Social Studies textbooks for the fourth grade of primary school. The research sample is deliberate and stratified: it consists of Science & Social Studies textbooks for the fourth grade of primary school, published by the Institute for Textbooks Publishing and Teaching Aids. 121 primary school teachers from the Zlatibor and Moravicki Districts participated in this research. Independent evaluators assessed the distribution of several categories that relate to the values of individualization: 1) content in two levels of difficulty - remedial content for students with poor performance and additional content for good students; 2) examples designed in three levels of difficulty - for students with the weakest performance, for average students and for exceptional students; 3) exercises in three levels of difficulty - for students with the weakest performance, for average students and for exceptional students; 4) various procedures for solving problem-based tasks where: there are several problem-based tasks and students need to choose one, students just need to solve problem-based tasks, students define and solve problem-based tasks on their own and students identify the problem, formulate and solve it. The Likert five-point scale of responses was used for the evaluation of primary school teachers' attitudes toward the present values of individualization in the sample textbooks. The data was processed with the use of SPSS 16.0 software package, and the hypotheses were tested by calculating the intelligence quotient and the chi square. The results of the evaluation of primary school teachers by independent evaluators show that the values of individualization are insufficiently present in Science & Social Studies textbooks, that teachers' qualifications and years of experience do not affect the results and that this problem needs a more significant scientific research and professional attention. The issue of modernizing existing Science & Social Studies textbooks is thus actualized. One of the possible solutions could be an electronic Science & Social Studies textbook which can offer better technical solutions than its classic equivalent and help individualize educational work.