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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
41

'n Konstruktivistiese onderrrig-leerprogram vir die verbetering van ambagsgerigte opleiding aan die Sedibeng Verdere Onderwys en Opleidings (VOO)-kollege / Schalk Willem du Plessis

Du Plessis, Schalk Willem January 2012 (has links)
This study was undertaken in an attempt to improve the vocational training in Electrical Systems and Construction done at the Sedibeng Further Education and Training Colleges. The development of vocational training in South Africa, as well as different approaches to effective teaching and learning, were investigated by doing a literature study. It was determined that a constructivist approach to teaching and learning that advocates an active, learner-centred approach to teaching and learning appears to be the most effective for vocational training. An empirical investigation was conducted to determine possible shortcomings in the current way of teaching, learning and assessment at Sedibeng Further Education and Training College. For this purpose, mixed method research with a triangulation design was employed. The quantitative part of the study utilized descriptive survey research with a questionnaire to establish Level 3 educator and learner viewpoints regarding the current nature of teaching, learning and assessment. A phenomenological strategy was used for the qualitative part of the study, which involved the use of semi-structured interviews with the management staff at the college, to obtain their perspectives regarding training at the college. The quantitative and qualitative data indicated weaknesses in the current approach to teaching, learning and assessment, and that teaching, learning and assessment practices could become more effective by incorporating constructivist teaching, learning and assessment principles that encourage active and interactive learning. Furthermore, a lack of teacher training and a lack of practical experience among educators, as well as inadequate infrastructure and ill-equipped facilities, are major contributing factors to ineffective vocational training. The practical contribution of the study is found in the teaching and learning programme for Electrical Systems and Construction based on constructivist principles that was developed to assist educators to improve the effectiveness of vocational training. / Thesis (PhD (Learning and Teaching))--North-West University, Vaal Triangle Campus, 2013
42

The choice of learning and teaching support materials in inclusive classroom settings : "educators' experiences" / Phindiwe Aletta Motloung

Motloung, Phindiwe Aletta January 2008 (has links)
This study investigates educators' experiences in choosing material for learners in the inclusive classroom setting as clearly stated in chapter one. Chapter two explored the literature on the learning and teaching support materials and the processes involved. The definition of learning and teaching support materials was explored. The kinds, importance and role of learning and teaching support, were discussed and the role is seen as a vehicle which enhances the awareness for expression and opportunities to capture evidence of learners knowledge. Guidelines to consider in the process of selecting learning and teaching support materials and the utilization thereof, as well as the funding of learning and teaching support materials received attention. This chapter further explored the inclusive classroom where inclusion is defined; the nature of inclusive classroom was discussed. The benefits and the criticism of inclusive classroom settings were also explored. In chapter three, the empirical research design used in the study is discussed. Focus group interviews in qualitative study were used to explore educators' experiences in choosing learning and teaching support material in inclusive classroom settings. Chapter four highlighted the research methods used to investigate the problems of this study. The application of the focus interview was explained in detail because the focus group was used for the collection of data which was analysed and interpreted. The data revealed that educators experience a number of difficulties in choosing learning and teaching support materials for learners in inclusive classroom settings. The last chapter concludes the study with recommendations on the way to assist educators in choosing materials for learners in the inclusive classroom setting. / Thesis (M.Ed.)--North-West University, Vaal Triangle Campus, 2008.
43

Processing of L2 words in bilingual children and adults : predictors, patterns, and tendencies

Zhao, Ting January 2015 (has links)
Within the context of foreign language learning, very little research has examined how learners process second language (L2) words in terms of which variables best predict their processing speed and which mechanisms best characterize bilingual lexical processing. The present study set out to address this gap by using a range of learner and lexical variables (such as vocabulary size, word length, and age of acquisition) as points of reference against which to identify the best predictors of children’s and adults' L2 lexical processing, and by comparing response latencies across stimulus conditions so as to identify the processing pattern specific to each age group. Thirty-nine primary-aged and 94 university-level Chinese learners of English performed a picture-naming task in English and then in Chinese, and then completed a Chinese-to-English task. The researcher analyzed and estimated how those learner and lexical variables predicted the recorded response latencies by means of multiple regression and structural equation modeling, and made cross-stimulus-condition comparisons with the use of analysis of variance. The results suggested that different aspects of vocabulary knowledge contributed significantly to predicting children's and adults' processing speed, and that shorter processing time was significantly and directly predicted by the younger age at which an L2 word was learned and its higher degree of word typicality. Both lexical association and conceptual mediation were present in L2 lexical processing irrespective of learners' age but in general the later an L2 word is learned, the greater the likelihood that the word is lexically accessed and processed. These results illustrate the crucial role that language experiences and conceptual structures play in influencing the ease or difficulty with which L2 lexical items are retrieved, and reflect the complexities and dynamics involved in processing bilingual lexicons. These findings will be discussed within the context of the role of research and theory in developing evidence-based pedagogical practice with a specific reference to vocabulary acquisition in children and adults learning foreign languages within input-limited contexts.
44

Studenti učitelství s poruchou učení / Students of teaching with learning disabilities

Pejchalová, Michaela January 2015 (has links)
in English The thesis focuses on trainee teachers with specific learning disabilities. Its aim is to map their university study and teaching practice. The research part is supplemented with a short survey showing public opinion on teachers with learning disabilities. The thesis is based on empirical research of qualitative nature with quantitative information. Data were obtained from semi structured interviews with students of teaching with specific learning disabilities and from the questionnaire conducted which the public. Another analysis (qualitative and quantitative) and an interpretation of the data followed. All the findings were then compared with the data fixed in literature. The written work consists of three major parts. The theoretical part is predominantly based on abroad scientific sources of information about people with dyslexia studying at a university and employed. The second part of the thesis describes the methodology of the research and the analysis of the data. The two most important results of the research are represented by a number of features which describe a trainee teacher with specific learning disabilities, and the public opinion on such a person. The third part of the thesis discusses and summarizes similarities and differences of the research and a relevant...
45

A linguagem cartográfica e a mediação da aprendizagem pelo processo de desenvolvimento de materiais didáticos táteis: Experiências com professores em formação contínua / the cartographic language and mediation of learning through the process of development of tactile learning materials: experiences with teachers in training

Bittencourt, Aline Alves 20 September 2011 (has links)
Esta pesquisa aborda a aprendizagem da linguagem cartográfica mediada pelo processo de desenvolvimento de recursos didáticos táteis, com as contribuições da perspectiva sócio histórica. O recorte teórico sobre linguagem e cartografia escolar e tátil buscou embasar as discussões sobre o ensino de geografia a partir da dialogia na mediação pedagógica e ressaltar a importância do domínio da linguagem cartográfica. O processo de desenvolvimento de materiais táteis como mediação na aprendizagem foi analisado a partir da realização de duas oficinas em cartografia tátil e entrevistas. Objetivando-se valorizar a pesquisa educacional qualitativa e as reflexões do professor sobre sua prática, a metodologia da pesquisa-ação serviu à coleta de dados, como elementos colaborativos e narrativos enquanto aspectos fundamentais. Discutiu-se com professores o processo cartográfico como mediador da aprendizagem da linguagem cartográfica frente aos desafios encontrados para o ensino de geografia e para um uso social da linguagem cartográfica, verificando-se possibilidades e mudanças no discurso e nas práticas pedagógicas. Acreditase que os professores possam ser atores educacionais e produtores de seu instrumental de trabalho, com subsídios teóricos e metodológicos para o planejamento de atividades, e que seja também um processo significativo o ato de mapear o seu trabalho docente. / This research addresses the learning of the cartographic language mediated by the process of tactile didactic resources development, with the contributions of socio-historic perspective. The theoretical framework of language and tactile school cartographic sought to base discussions on the teaching of geography from the dialogues within the pedagogical mediation, enhancing the importance of cartographic language and its knowledge. The process of tactile materials development as mediation in learning was analyzed in view of two workshops offered about tactile maps to teachers and the interviews with them. Aiming to enhance the qualitative educational research and teachers reflections on their practice, the methodology based on action -research was used to collect data, such as collaborative and narrative elements as fundamental aspects. The mapping process was discussed with teachers as a mediator of learning the cartographic language, facing the challenges found in geography teaching. Also having in mind a social use of the cartographic language and considering the possibilities and changes in discourse as well the pedagogical practices. The author argues that teachers can be educational actors and producers of their work and resources, with theoretical and methodological basis for the activities planning, and having the act of mapping as significant process.
46

Evolução das crenças de licenciandos relacionadas ao ensino, à aprendizagem e à motivação - um estudo de caso do contexto do PIBID - física / Evolução das crenças de licenciandos relacionadas ao ensino, à aprendizagem e à motivação - um estudo de caso do contexto do PIBID - física

Barbosa Neto, Ozório Saturnino 10 November 2017 (has links)
Este trabalho apresenta os resultados de uma pesquisa realizada no âmbito do PIBID-Física da USP entre os anos de 2014 e 2015. Trata-se de uma observação participante que teve o objetivo principal de identificar o que quatro licenciandos pensavam em relação à motivação dos alunos. De que forma eles levam em conta essa questão? Além disso, identificamos suas crenças sobre ensino e aprendizagem, procurando indícios de uma evolução nessas crenças durante o período em que eles participaram do grupo assim como se há relação entre elas. Nosso trabalho de observação buscou acompanhar todas as reuniões de grupo realizadas no período, gravando o áudio de cada uma delas. Utilizamos como dados suas declarações diretas, relatórios, análises e discussões ocorridas ao longo dessas reuniões. Também realizamos uma entrevista semiestruturada com cada um dos sujeitos. Através dos resultados concluímos que há relação entre as suas crenças de ensino e aprendizagem com as motivacionais. O nível de desafio oferecido pelo contexto onde os licenciandos desenvolvem sua prática é um ponto importante para a evolução de suas crenças, assim como a reflexão do trabalho desenvolvido pelos licenciandos ao longo das reuniões. Ademais os professores supervisores têm papel importante em relação a essa evolução, assim como as disciplinas cursadas pelos licenciandos. / This paper presents the results of a research carried out within the framework of the PIBID-Physics of USP between the years 2014 and 2015. It is a participant observation that had the main objective of identifying what four licensees thought about the motivation of the students . How do they take this issue into account? In addition, we identify their beliefs about teaching and learning, looking for evidence of an evolution in these beliefs during the period in which they participated in the group as well as whether there is a relationship between them. We use as data your direct statements, reports, analyzes and discussions that have occurred throughout the meetings of the group. We also conducted a semi-structured interview with each of the subjects. Through the results, we conclude that there is a relationship between their teaching and learning beliefs and their motivational beliefs. Supervisory teachers have an important role in relation to evolution, as do the courses taught by the licenciandos.
47

O gênero multimodal tutorial em vídeo e suas contribuições no ensino-aprendizagem de francês como língua estrangeira por adolescentes / The multimodal genre video tutorial and its contributions to the teaching and learning of French as a foreign language by teenage students

Sumiya, Aline Hitomi 12 December 2016 (has links)
Esta dissertação tem como objetivo estudar o ensino-aprendizagem do francês como língua estrangeira por alunos adolescentes por meio da produção do gênero multimodal tutorial em vídeos, bem como verificar como os alunos desenvolveram as capacidades de linguagem por meio de uma sequência didática visando a produção desse gênero. Para realizá-la, nos embasamos, sobretudo, no quadro teórico-metodológico do Interacionismo Sociodiscursivo (ISD), tal como apresentado por Bronckart (1999, 2003, 2006, 2008, 2010) para a compreensão do agir humano por meio da linguagem e de seu consequente desenvolvimento. Assim, apoiamo-nos no modelo de análise textual do ISD para o estudo dos aspectos verbais presentes no gênero tutorial em vídeos. Como o gênero articula tanto os aspectos verbais como não verbais na sua construção de sentido, servimo-nos do quadro da Semiótica Sociointeracional proposta por Leal (2011) em que a autora propõe a união do quadro de análise do ISD com as categorias da Gramática do Design Visual (GDV) desenvolvida por Kress e Van Leeuwen (2006). Além disso, baseamo-nos nos estudos de Schneuwly e Dolz (2004/2012) sobre a utilização de gêneros textuais como instrumentos no ensino-aprendizagem e em Dolz, Pasquier e Bronckart (1993) sobre a noção de capacidades de linguagem. No que concerne ao campo da didática de línguas (maternas e estrangeiras), tivemos como aportes os estudos de outros teóricos da vertente do ISD (SCHNEUWLY; DOLZ, 2004/2012; CRISTOVÃO, 2014/2015; LOUSADA, 2014, MELÃO, 2014). Para ter o gênero como objeto de ensino, fizemos uma análise textual, o modelo didático, e posteriormente, elaboramos uma sequência didática e aplicamos em duas turmas de adolescentes. Após a aplicação, analisamos as produções iniciais e finais com a finalidade de saber se houve o desenvolvimento das capacidades de linguagem dos alunos. Para trazer mais indícios sobre o desenvolvimento, recuperamos excertos do diário de bordo da professora e das conversas gravadas dos alunos trocadas no momento da produção. Os resultados mostraram que houve um desenvolvimento significativo das capacidades de linguagem dos alunos, embora o gênero seja complexo por articular tanto elementos verbais como não verbais. Ademais, o gênero permitiu a aprendizagem dos alunos no que diz respeito a outros saberes não previstos no nosso estudo. Com esta pesquisa, esperamos ter trazido contribuições ao ensino-aprendizagem de línguas por meio de gêneros textuais, à multimodalidade e aos gêneros emergentes na era digital. / This dissertations goal is to study the teaching and learning of French by teenage students through the production of the multimodal genre video tutorial, as well as verify how the students developed the language capacities through a didactic sequence that aimed at the production of this genre. Our research was based mainly on the Socio-Discursive Interactionism (SDI) theoretical and methodological framework as developed by Bronckart (1999, 2003, 2006, 2008, 2010) to understand human acting through language and its consequent development. This research is also based on the SDI textual model analysis to study the verbal aspects found in the video tutorial genre. Since verbal and nonverbal aspects are combined in this genre, we used the Socio-Interactionism Semiotics proposed by Leal (2011) in which the author suggests the union of the SDI analysis framework with the Grammar of Visual Design (GVD) developed by Kress and Van Leeuwen (2006). In addition, this research is based on the studies by Schneuwly and Dolz (2004/2012) about the use of textual genres as instruments in teaching and learning and about the concept of language capacities. Regarding the field of language didactics (L1 and L2), we also employed studies by SDI scholars (SCHNEUWLY; DOLZ, 2004/2012; CRISTOVÃO, 2014/2015; LOUSADA, 2014, MELÃO, 2014). In order to use the genre as an object of teaching, we analysed some texts and created a didactic model of it; then, we created a didactic sequence which we applied to two classes of teenage students. After applying it, we analysed the initial and final productions in order to discover if the students developed their language capacities. We had access to some excerpts of the teachers journal and to some conversations recorded between the students when doing their productions to have more clues about the development. The results showed that the students developed substantially their language capacities, in spite of the complexity of the genre due to the articulation of so many verbal and nonverbal elements. Moreover, the genre allowed the students to learn other knowledge that were not foreseen in our study. With this research, we hope to bring contributions to the field of teaching and learning of languages through textual genres, of multimodality and of emergent genres of the digital era.
48

A organização da prática educativa em geometria: Contribuições da teoria piagetiana

Scortegagna, Glaucia Marise 07 May 2008 (has links)
Made available in DSpace on 2017-07-21T20:31:38Z (GMT). No. of bitstreams: 1 Glaucia Marise.pdf: 2191981 bytes, checksum: ba42821b294837af6c0c6b305f2ac22f (MD5) Previous issue date: 2008-05-07 / This research sought to establish inter-relations between the results of the studies of the Piaget and Inhelder to the perception and representation of space and the process of teaching of geometry; identify as children establish the spatial relationships of topological nature, and projective Euclidian and highlight the contributions of those studies. Therefore, we organize activities adapted from the work of Piaget and Inhelder (1993) “The representation of space in the child” and proposed to a group of children aged eight and nine years of a school hall of Ponta Grossa, in the state of Paraná. We use a interview, which provided data for the analysis, with regard to the arguments and justifications of the children. We assumed to contribute to the teacher with the teaching of geometry is important that he understands how children establish the spatial relationships in the physical world to relate this world with the geometric. Evidence was found emphasizing that knowledge of this theory by the teacher, he can help interpret the responses of children and propose activities that they are able to achieve, including the reasons for their difficulties; We can say that the inter-relationships found relate to the fact the spatial relationships established in the physical world, concern forms, and travel distances in all this is study of geometry. It also could identify the relationships established by the children, showing to what extent they relate to geometric knowledge. / Esta investigação buscou estabelecer inter-relações entre os resultados dos estudos piagetianos referentes à percepção e representação do espaço e o processo de ensino da Geometria; identificar como as crianças estabelecem as relações espaciais de natureza topológica, projetiva e euclidiana; e evidenciar as contribuições dos resultados dos referidos estudos piagetianos. Para tanto, organizamos atividades adaptadas da obra de Piaget e Inhelder (1993), “A representação do espaço na criança”, e as propusemos a um grupo de crianças com idades entre oito e nove anos, de uma escola municipal de Ponta Grossa, no estado do Paraná. Utilizamos a entrevista, que nos forneceu dados para as análises, no que diz respeito aos argumentos e justificativas das crianças. Partimos do pressuposto de que para o professor contribuir com o ensino da Geometria é importante que ele compreenda como as crianças estabelecem as relações espaciais no mundo físico para relacionar esse mundo com o geométrico. Evidências foram encontradas, ressaltando que o conhecimento dessa teoria, por parte do professor, pode contribuir para que ele interprete as respostas das crianças e proponha atividades que elas tenham condições de realizar, compreendendo os motivos de suas dificuldades. Podemos afirmar que as inter-relações encontradas se referem ao fato de que as relações espaciais estabelecidas no mundo físico dizem respeito a formas, distâncias e deslocamentos e tudo isso é objeto de estudo da Geometria. Também pudemos identificar as relações estabelecidas pelas crianças, evidenciando em que medida elas se relacionam com os conhecimentos geométricos.
49

Unindo as pontas da teoria e da prática : contribuições da pedagogia de gêneros sob o viés da linguística sistêmico-funcional na leitura e na escrita de notícias jornalísticas

Pires, Carolina Zeferino January 2017 (has links)
Esta dissertação tem como objetivo apresentar a implementação de uma proposta de ensino de leitura e de escrita, a partir dos pressupostos da Linguística Sistêmico-funcional de Halliday (HALLIDAY, 2014, 2008, 1978) e da Teoria de Gêneros, proposta pela Escola de Sidney (MARTIN; ROSE, 2008, 2012). A implementação visa a investigar como a Pedagogia de Gêneros, baseada no Ciclo de Aprendizagem, pode auxiliar nos processos de letramento em sala de aula. Procura-se compreender o funcionamento do Ciclo de Aprendizagem para o desenvolvimento da leitura e da escrita de notícia jornalísticas, discutir quais dificuldades ou facilidades os sujeitos apresentaram e analisar os textos produzidos pelos aprendizes. A Usina do Texto, projeto oferecido aos alunos do sexto ano do ensino fundamental de uma escola da rede municipal de ensino de Porto Alegre, foi o ambiente no qual foi implementada a metodologia prevista no Ciclo de Aprendizagem e nos ciclos de interação. O projeto tem como base teórica os pressupostos a Pedagogia de Gêneros da Escola de Sidney e constituiu-se como o contexto da presente pesquisa. A partir de uma pesquisa qualitativa-interpretativa, procurou-se compreender o funcionamento do Ciclo de Aprendizagem no desenvolvimento da leitura e da escrita das notícias. As análises dos textos produzidos pelos alunos auxiliaram na análise proposta e é estabelecida a partir da noção do Contexto de Cultura, gênero, e do Contexto de Situação, registro. Desta forma, como resultado das observações e das análises textuais, percebe-se que os aprendizes mobilizam os recursos contextuais, semânticos e disponíveis, abordados ao longo das etapas do Ciclo de Aprendizagem. Acredita-se que esta pesquisa possa contribuir nas discussões teóricas sobre gênero sob o viés da Escola de Sidney. / This dissertation aims to present the implementation of a proposal for teaching reading and writing, based on the premises of Halliday's Systemic-functional linguistics (HALLIDAY, 2014, 2008, 1978) and Genres Theory proposed by the Sydney School (MARTIN; ROSE, 2008, 2012). The implementation aims to investigate how the Genres Pedagogy, based on the Learning and Teaching Cycle, can support in the processes of literacy in the classroom. The search is to understand the Learning and Teaching Cycle functioning for the reading and writing of journalistic news development, to discuss what difficulties or facilities the subjects presented and to analyze the texts produced by the learners. The Usina do Texto, a project offered to the students of the sixth year of elementary school in Porto Alegre municipal school system, was the environment in which the methodology precribed in the Learning and Teaching Cycle and in the interaction cycles was implemented. The project is based on the presuppositions of Genres Pedagogy of Sydney School and was constituted as the context of the present research. Based on a qualitative-interpretive research, the aim was to understand the functioning of the Learning and Teaching Cycle in the development of reading and writing of news. The analyzes of the texts produced by the students assisted in the proposed analysis and is established from the notion of the Context of Culture, genre, and the Context of Situation, register. Thus, as a result of the observations and of the textual analyzes, it is perceived that the learners mobilize the contextual and semantic available resources, addressed throughout the sta0ges of the Learning and Teaching Cycle. It is believed that this research can contribute to the theoretical discussions about genre under the bias of Sydney School.
50

A construção de discursos escritos sobre aquecimento global: análise das explicações dos alunos / Written discourse about global warming: analysis of students\' explanations

Leandrini, Sarah Milani de Moraes 26 August 2011 (has links)
O ensino de ciências deve ser estruturado de forma a dar condições para que os alunos se aproximem da cultura científica, aprendendo não só os conceitos, mas também as práticas e linguagens específicas da ciência, e construindo uma autonomia intelectual para poder tomar decisões no seu cotidiano. Partindo deste pressuposto, nos propomos a investigar o que os alunos escrevem quando opinam sobre aquecimento global e como eles se apropriam de um material de divulgação sobre o assunto. Os textos analisados são provenientes de um concurso de redações promovido por uma emissora de televisão da região de Ribeirão Preto (SP), cujo tema era \"Aquecimento Global: e eu com isso?\" e o material de divulgação é um DVD produzido pela emissora para as escolas. Buscamos caracterizar os textos dos alunos segundo o gênero discursivo predominante, as idéias principais e o tipo de abordagem e discurso presentes, como eles utilizam o conhecimento científico e qual é a noção de efeito estufa presente. Fizemos as mesmas análises para o DVD e comparamos com os conteúdos das redações. Nossos resultados mostram que os alunos escrevem, em sua maioria, textos dissertativos e narrativos sobre as causas e consequências do aquecimento global relacionadas às atividades humanas e as medidas para resolver o problema. Eles usam predominantemente as dimensões ambientalista e pessoal para compor seus textos, e menos da metade utiliza uma abordagem ou linguagem próximas da científica. Dos alunos que utilizam conhecimento científico nas suas redações, metade fornece explicações que justificam suas afirmações. Grande parte não menciona o efeito estufa em seus textos, e poucos estabelecem a relação de que o efeito estufa causa o aquecimento global, mostrando pouco entendimento conceitual. Sobre a apropriação do DVD, de modo geral poderíamos dizer que os alunos não se posicionam diante deste material, mas quando detalhamos as idéias principais e cada dimensão do texto percebemos que eles questionam alguns conteúdos do DVD. Concluímos que o papel de valores pessoais e morais e a consciência ambiental são importantes, mas é necessária maior atenção ao aprendizado de conhecimentos científicos, para que os alunos entendam o fenômeno e saibam escolher melhores alternativas para a resolução desse problema ambiental. / Science education should be structured to provide conditions for students to engage in the scientific culture, learning not only concepts but also the specific practices and language of science, building an intellectual autonomy to make decisions in their real life. Under this assumption, we propose to investigate what students write when they opine about global warming and how they appropriate a publicizing material on the subject. The texts analyzed are from a composition contest sponsored by a television broadcasting company in the region of Ribeirão Preto (SP) with the theme \"Global Warming: what do I have to do with it?\" and the publicizing material is a DVD produced by the company for the schools. We sought to characterize the students\' texts according to the genre of speech that is predominant, the main ideas and the approach and discourse that are present, how they use the scientific knowledge and what concept of greenhouse effect they presented. We analyzed the DVD with the same approach and compared it with the contents of the compositions. Our results show that most students write argumentative and narrative texts about the causes and consequences of global warming linked to human activities and the measures aiming to resolve the problem. They predominantly use personal and environmental dimensions to compose their texts, and less than half of them use an approach or language close to the scientific. Half of the students who use scientific knowledge in their essays provide some kind of explanation that justifies their assertions. Most of them did not mention greenhouse effect in their texts, and few have established the relationship that the greenhouse effect causes global warming, showing little conceptual understanding. Regarding the appropriation of the DVD, in general, we could say that the students do not position themselves before this material, but when we specify the main ideas and each dimension of the texts we see that they question some of the contents of the DVD. We conclude that moral and personal values and environmental awareness are important when it comes to this kind of problem, but we must also pay greater attention to the learning of scientific knowledge if we want students to understand the phenomenon and know how to choose the best alternatives for resolving the problem.

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