Thesis advisor: Dennis Shirley / Schools and classrooms in the United States are increasingly religiously diverse, and religion remains a deeply influential social force, locally, nationally, and globally. However, decades of misunderstanding about the constitutionally appropriate relationship between religion and public education have created a cycle of silence about religion in K-12 schools and in teacher education. As a result, public school educators are not prepared to teach about religion in the curriculum. Nor do they have the skills to respond to common challenges that arise in religiously diverse school communities. This dissertation examines four professional development courses about religious diversity to understand the motivations and experiences of the educators who participated and to explore the impacts these courses had on the educators’ teaching practices. The 145 participants in the professional development courses learned about several religious traditions through a combination of visits to religious communities, guest speakers, and classroom discussion. The mixed methods study surveyed the participants three times, once before the courses, and twice afterwards. Follow-up interviews with 13 educators were conducted approximately one year after they completed the courses. The findings reveal that educators working at all grade levels and in all content areas found valuable benefits from increasing their understanding of religion, including a greater appreciation for the religious identities of their students and increased comfort with religion when it appeared in a range of school settings. Based on my analysis, I propose a framework of Pedagogical Content Knowledge about Religion to describe five domains of knowledge and skills that are necessary for educators to be able to competently respond to religion in public schools. This framework and the findings of this study have valuable implications for the development of future professional development courses and in charting a trajectory for further research on religion in U.S. public schools. / Thesis (PhD) — Boston College, 2019. / Submitted to: Boston College. Lynch School of Education. / Discipline: Teacher Education, Special Education, Curriculum and Instruction.

A pesquisa acerca dos conhecimentos dos professores representa a identificação e o resgate da base de conhecimento que sustenta a profissão do professor. Consideramos que as contribuições de Shulman são subsídios fundamentais à profissionalização docente, pois atrela os saberes pedagógicos aos específicos através do Conhecimento Pedagógico do Conteúdo, PCK. Nesta investigação analisamos o desenvolvimento do PCK de dois professores que participaram de um processo reflexivo num grupo colaborativo. Tal processo promoveu ações individuais e em grupo na forma de textos escritos e discussões orais. As ações reflexivas no grupo foram realizadas através da observação do vídeo de uma aula, apresentação do processo de análise pelo próprio professor e por um par utilizando o ciclo de Smyth e a análise pelo grupo tanto da discussão da aula como das análises individuais realizadas. A análise dos dados foi baseada no Modelo Hexagonal proposto por Park e Oliver, que apresenta como componentes: i.) Orientações para o Ensino de Ciências; ii.) Conhecimento do Currículo em Ciências; iii.) Conhecimento da Avaliação da Aprendizagem em Ciências; iv.) Conhecimento da Compreensão dos alunos em Ciências; v.) Conhecimento das Estratégias Instrucionais para o Ensino de Ciências e; vi.) Eficácia do professor. Analisamos ainda as intervenções discursivas ocorridas em sala de aula através da ferramenta proposta por Mortimer e Scott. Os professores investigados, a partir do processo reflexivo, tomam consciência de algumas características de suas atuações que não lhe eram transparentes. Essa reflexão atinge um maior nível de aprofundamento com a participação do grupo colaborativo, revelando um processo de desenvolvimento de conhecimento pedagógico do conteúdo de modo semelhante ao proposto pelo modelo de raciocínio pedagógico e ação de Shulman. Dentre os componentes do modelo hexagonal destaca-se a eficácia do professor como um importante aspecto do desenvolvimento do PCK. P1 apresenta uma prática contraditória com suas concepções reveladas em vários dos materiais analisados. Sua eficácia como professor não é boa e, sendo assim está mais propenso a mudanças em sua prática. A professora P2, por sua vez, mostra-se bastante segura e não há dúvidas sobre sua eficácia, embora atue de uma forma totalmente centrada no professor. Embora P2 perceba sua postura e nem sempre concorde com ela, sua eficácia a mantém nesse modelo didático. A eficácia parece assim ser um importante aspecto de desenvolvimento do PCK parecendo atuar como uma força propulsora das mudanças ou das permanências. Nosso trabalho reafirma também a importância da reflexão na formação contínua de professores de forma colaborativa. O processo reflexivo apresentado explicitou o PCK desses professores investigados permitindo que os professores se constituíssem de forma distinta e começassem a buscar novos caminhos em suas ações pedagógicas ou que se percebessem bem da forma que se encontram. / The teacher knowledge research deal with the identification of the base knowledge that supports the profession of teacher. We consider the Shulman contributions\' as fundamental base to the teacher professionalization, it links specific to pedagogical content knowledge, establishing what he calls \"pedagogical content knowledge\" (PCK). In this study we analyze the PCK development of two teachers during a reflective process in a collaborative group. The process promoted individual and group actions by using written texts and oral discussions. The group reflective actions were accomplished through a class video observation, presentation of the analysis process by own teacher and by a colleague using the Smyth cycle. Also were accomplished the group analysis both the class discussion and individual analyses. Data analysis were performed based on the Hexagonal Model proposed by Park e Oliver, which has as components: 1) Orientations to Science Teaching, 2) Science Curriculum Knowledge, 3) Assessment of science learning Knowledge, 4) Knowledge of understanding of students in science, 5) Knowledge of Instructional Strategies and Representations for science teaching, and 6) Teacher efficacy. We also analyze the discoursive interactions occurred in the classroom through the tool proposed by Mortimer and Scott. The investigated teachers, from the reflective process, are awared of some own actions in classroom. The reflection is improved during the collaborative group and reveals a process of PCK development similar to that one proposed by Shulman in the Pedagogical Reasoning and Action Model. Among the hexagonal model components we emphasize the teacher efficacy as an important aspect of the PCK development. P1 shows a contradictory action in classroom revealed through several analysed data. P1 doesn´t have a good efficacy as teacher and so he is more able to look for changes in his practice. On the other hand, P2 is very secure and there is no doubt about her efficacy. Even though she has a teacher-centered action and not always she is confortable with her practice, she doesn´t want to change much in result of her efficacy. So, teacher efficacy seems to be an important aspect of the PCK development acting as a driving force of changes or of permanence. Our work states also the importance of reflection in a collaborative group during in-service education. The reflective process presented could make explicit the teachers\" PCK allowing these teachers a new comprehension of themselves. Also the reflective process shows teachers new ways of acting or it shows they were fine with their actions at classroom.

I denna intervjustudie fokuserar vi på lågstadielärares olika kunskaper och hur dessa  påverkar undervisningen. Vår studie utgår från de 7 intervjuer som vi har genomfört, där lärarnas egna kunskaper framställs samt vad deras val har för betydelse för engelskundervisningens utformning. Syftet med vår studie är att synliggöra vilka didaktiska beslut lärare tar i engelskundervisningen och hur dessa beslut kan påverkas av lärarens ämneskunskaper, ämnesdidaktiska kunskaper samt kunskaper om läroplanen. I studien argumenterar vi för att lågstadielärare är i behov av ovanstående kunskaper för att kunna bedriva en meningsfull engelskundervisning på lågstadiet.

The current qualitative study focused on understanding the process of learning to teach. Using interviews of teacher educators, the study explored the importance of a set of teaching activities developed as part of the Teacher Self Efficacy Survey (Tschannen- Moran & Woolfolk Hoy, 2001) as well as the inclusion of instructional and assessment strategies for the teaching activities and the quality of beginning teacher performance of the activities. Data were collected from interviews of 15 teacher educators. A process of open, axial, and substantive coding was applied to the data to inductively identify and categorize data relevant to the purpose of the study and to allow comparisons among and between categories. Findings suggested that teaching activities are critically important to and a comprehensive description of effective teaching, and that beginning teachers struggle with differentiation and applying their learning to their practice. Further, findings suggested that the source of beginning teacher struggles was found within the teacher education program, within school contexts, and between the two institutions. In addition, findings suggested that beginning teachers perform the student engagement activities and those related to instructional strategies more proficiently than classroom management activities, and that all three teaching activity categories were included in the curriculum, but to different degrees and not all as part of curriculum design. A variety of pedagogies were used to prepare preservice teachers; however, there was no reported knowledge of assessment instruments used to measure preservice teachers’ readiness for teaching and to obtain data on the performance of their graduates. Lastly, this study revealed that teacher education program leaders were reluctant to participate in a study that sought to draw direct connections between the skills taught in the program and how well beginning teachers perform them. Based on the findings, the researcher recommends further studies to determine the viability of the teaching activities as a comprehensive and accurate definition of effective teaching. Further the researcher recommends that teacher education programs and school districts adopt the teaching activities as a consistent framework for providing preservice education, for setting school district expectations, and for conducting teacher evaluations. / Includes bibliography. / Dissertation (Ph.D.)--Florida Atlantic University, 2016. / FAU Electronic Theses and Dissertations Collection

The quality of early caregiving and educational environments has a significant effect on children’s later cognitive outcomes. Early childhood teachers are an important determining factor in the quality of these environments. Due to inconsistencies in practice across the early childhood field, there is a call for better prepared teachers. Teacher preparation itself is criticized for its lack of innovative and effective practices. While research finds that more effective teacher preparation programs are those that are steeped in clinical practice, these types of experiences are inconsistent and fragmented in the early childhood field. Part of the issue is the lack of knowledge on how to integrate highquality clinical experiences carefully into early childhood teacher preparation in order to prepare all preservice teachers successfully for the classroom. / Includes bibliography. / Dissertation (Ph.D.)--Florida Atlantic University, 2016. / FAU Electronic Theses and Dissertations Collection

Uma série de pesquisas faz referência ao estudo do desenvolvimento dos conhecimentos necessários ao professor, englobando o conhecimento sobre o conteúdo, o conhecimento sobre a prática e o conhecimento sobre as diversas teorias de ensino e como fazer a relação teoria/prática. Com similar relevância, a discussão entre formação inicial e continuada vem sendo abordada no sentido de propor currículos de formação que possam contribuir cada vez mais para a formação de profissionais reflexivos. O conceito de Conhecimento Pedagógico do Conteúdo (PCK), inicialmente proposto por Shulman, está relacionado a um conjunto de saberes que vão além do conhecimento técnico do conteúdo, incluindo as formas de representações sobre o conteúdo e sua seleção, as exemplificações e analogias, as metodologias didáticas que podem ou não favorecer o aprendizado significativo deste ou daquele conteúdo. Esse conceito tem sido ampliado, desde o entendimento de Van Driel como conhecimento referido a um tópico particular do ensino juntamente com o conhecimento da experiência de como ensinar este tópico até o de Kind em que aponta o PCK como o conhecimento que os professores utilizam durante o processo de ensino. Neste trabalho investigamos o desenvolvimento do PCK de professores formados no curso de licenciatura em Química do Instituto de Química da Universidade de São Paulo e que hoje atuam como professores de química no ensino médio e superior. Nossos dados envolvem as atividades escritas, as gravações das aulas ministradas e as reflexões de três licenciandos que cursaram a disciplina Instrumentação para o Ensino da Química I, além de entrevistas e gravações em áudio de aulas de Química desses professores em seus contextos reais de sala de aula após um período que variou de três a cinco anos depois de formados. Utilizamos os instrumentos CoRe (Representação de Conteúdo) e PaP-eRs (Repertórios de experiência Profissional e Pedagógica) para documentar a prática desses professores e assim, reconhecer seu PCK. Para as análises utilizamos o Modelo de Raciocínio Pedagógico e Ação de Shulman e os tipos de conhecimento do modelo de Morine-Dershimer e Kent. Utilizamos também a ferramenta de análise de discurso proposta por Mortimer e Scott para identificar padrões de interação. Nesses professores, o desenvolvimento do PCK foi promovido durante a formação inicial através de experiência de planejamento e intervenção em sala de aula e atividades que buscaram estimular a reflexão sobre a ação. Os dados após três anos de experiência profissional revelam um incremento no PCK desses professores resultante da experiência em sala de aula e do processo reflexivo. A partir das análises realizadas, algumas implicações são fornecidas para a formação de professores de química. Apontamos para a necessidade de cuidar desse momento especial na trajetória dos professores - os anos iniciais de experiência profissional. Salientamos a necessidade de atuar nesse início de carreira, com grupos colaborativos, com intuito de contribuir mais diretamente para o desenvolvimento do PCK. / The literature refers to the study of the development of teacher knowledge, encompassing content knowledge, practical knowledge and the knowledge about different teaching-learning theories and how to deal with the theory/practice relationship. With similar relevance, the discussion about pre-service and in-service teacher education has been approached in order to propose teacher education curricula that can increasingly contribute to the reflective practitioners. The Pedagogical Content Knowledge (PCK), initially proposed by Shulman, is related to a set of knowledge that go beyond the content knowledge and include the content representation and their selection, the examples and analogies, the methodologies that may or not facilitate the meaningful learning of this or that content. This concept has been amplified, since then. Van Driel understands PCK as the knowledge related to a particular subject matter as well as the knowledge from practice in how to teach this topic. Moreover Kind´s conception points out the PCK as the knowledge teachers use during the teaching process. In this work we investigated the PCK development of trained teachers, graduated the course from Chemistry Institute of University of São Paulo and now work as teachers of chemistry both in high school or university. Our data involve written activities, the recordings of the classes and the reflections that three undergraduates taking the Methodology for Chemistry Teaching course (QFL 2505), as well as interviews and audio recordings of Chemistry lessons from these teachers in their real contexts of their classroom after a period of three to five years of graduation. We used the instruments CoRe (Content Representation) and PaP-eRs (Pedagogical and Professional experience Relatories) to document the pedagogical practice and then, recognize the teacher\'s PCK. We relate some aspects in the teacher discourse to the Model of Pedagogical Reasoning and Action from Shulman and to the teacher knowledge components from Morine-Dershimer and Kent. We also used the discourse analysis tool from Mortimer and Scott to identify teaching approaches and interaction patterns. In the investigated teachers, the development of PCK was promoted during pre-service teacher education through the experience of planning and intervention on classroom and reflection-on-action activities. Data after three years of professional experience reveal an improvement on this teacher PCK resulting from the classroom experience and the reflective process. From the analysis, some implications are pointed out for chemistry teacher education. We emphasize the special moment during teacher\'s professional development - the initial years of professional experience. We point out the importance of work with collaborative groups during the initial phase of teaching in order to contribute more directly to the development of teachers PCK.

O conhecimento pedagógico do conteúdo (PCK, do inglês Pedagogical Content Knowledge) é o conhecimento usado pelos professores no processo de ensino (Kind, 2009). Trata-se de um conhecimento tácito que inclui as analogias, ideias e ilustrações que o professor utiliza para que um conteúdo específico seja compreensível ao aluno. Consideramos que este conhecimento também pode ser construído em professores em formação, durante o estágio supervisionado, pois é nessa etapa que a integração dos conhecimentos específicos e pedagógicos vai sendo construída com a prática em sala de aula. Neste trabalho investigamos sete licenciandos em química, que estavam divididos em dois grupos, e procuramos buscar as relações observáveis durante as atividades de estágio supervisionado com a formação do PCK. Nossos dados foram coletados a partir de quatro instrumentos - CoRe (Representação de Conteúdo), planos de aulas, registro audiovisual da regência dos licenciandos num contexto real de sala de aula e as reflexões dos mesmos registradas num diário de bordo. Para a análise dos dados utilizamos as categorias estabelecidas por Loughran et al. (2000) conectadas ao Modelo Integrativo de Gess-Newsome (1999). Também identificamos os estágios de desenvolvimento do professor em formação de Dreyfus (2004) a partir dos dados coletados com esses professores em formação. Os resultados mostram que esses licenciandos apresentaram falhas importantes no conhecimento de conteúdo o que se faz refletir nos demais conhecimentos necessários à prática profissional. As licenciandas do grupo 1 encontram-se no primeiro estágio (Iniciante), pois se mostraram racionais e inflexíveis nas ações em sala de aula. Os licenciandos do grupo 2 se encontram no segundo estágio (Iniciante avançado), pois desenvolveram estratégias que os ajudou a articularem o conteúdo ao tempo disponível. Nosso estudo apresenta assim algumas evidências a serem somadas a outras pesquisas de que a construção do PCK de professores iniciantes pode ser melhor explicada pelo Modelo Integrativo. No caso desse estudo, os licenciandos estão ainda em fase de amadurecer seu conhecimento de conteúdo, muito embora apresentem alguns flashes dos demais conhecimentos componentes do PCK. / The Pedagogical Content Knowledge (PCK) is the knowledge used by teachers during the teaching process (Kind, 2009). It is a tacit knowledge that includes analogies, illustrations and ideas that the teacher uses in order to make subject matter content understandable to the student. We believe that this knowledge can also be built during training program since at this stage the integration of specific content and pedagogical knowledge is being built with the practice in the classroom. In this paper we investigate seven pre-service chemistry teachers, which were divided into two groups, and seek for the observable relations of PCK developing during the activities of pre-service teachers training. Our data were collected from four different tools - CoRe (Content Representation), lesson plans, audiovisual record of chemistry classes and reflections. For data analysis we used categories developed by Loughran et al. (2000) connected to the Integrative Model of Gess-Newsome (1999). We also identified the developmental stages of teacher training by Dreyfus (2004) from data collected with these student teachers. The results show these pre-service chemistry teachers have meaningful failures in the content knowledge which can be reflected in the others knowledge domains. The pre-service teachers from group 1 were categorized as in the first stage (Beginners). They were rational and inflexible during activities in the classroom. The group 2 teachers were categorized in the second stage (Advanced beginners) since they develop strategies that help themselves to articulate content and schedule. Our research presents some evidences the beginners teachers develop their PCK based on Integrative Model. In this study the pre-service teachers are still developing their content knowledge, even though we could see some flashes from the others PCK components.

Students studying organic chemistry often have difficulty applying prior knowledge from general chemistry in their thinking about organic reaction mechanisms. In the United States, electrophilic aromatic substitution (EAS) mechanisms can be taught towards the end in a second-semester course of organic chemistry, providing students with almost two-semesters' worth of experience with organic chemistry reactions before solving problems on synthesis of substituted aromatic compounds.<div>Little research has been done on how, or if, instructors consider their students' prior knowledge or understanding of these concepts in EAS in their teaching activities. The purpose of this study was to describe how students reason through EAS synthesis problems and to identify concepts or gaps in understanding that inhibit students from successfully solving these types of problems. Participants were interviewed using a think-aloud protocol in which they were asked to describe the reactants and mechanisms necessary to synthesize di- and tri-substituted benzenes using EAS. The interviews were transcribed and analyzed using a qualitative inquiry approach and the data interpreted in terms of the ACS Examinations Institute's Anchoring Concepts Content Maps for general and organic chemistry.</div><div>The findings from this study indicated that while students correctly applied their knowledge of substituent effects to solve these types of problems, they relied on rote-memorization of these effects, resulting in inflexibility when applying them to novel situations. Additionally, students exhibited gaps in understanding of fundamental concepts in resonance theory and Lewis structures, differentiating and utilizing Friedel-Crafts reactions, and recognizing when to use oxidation/reduction reactions in their syntheses.</div><div>Another component of this study focused on instructors of organic chemistry from a range of institutions in the United States. The purpose of this study was to describe how organic chemistry instructors perceived their students' reasoning about these types of problems, and to describe the characteristics of each instructors' topic-specific pedagogical content knowledge (TS-PCK) and the three general knowledge domains (GKDs) instructors draw upon to inform their TS-PCK. These knowledge domains are knowledge of students, subject matter knowledge, and pedagogical knowledge. These participants were remotely-interviewed using a think-aloud protocol in which they were asked to describe their classroom practices and teaching strategies when teaching EAS, and to describe how they would synthesize the same aromatic compounds as their students (a selection of which were interviewed in the previous study). Participants were asked to consider how their students would approach the syntheses and to specify what parts of the syntheses their students would find challenging, and why. The interviews were transcribed and analyzed using a qualitative inquiry approach. </div><div>The findings from this study indicated that the instructors were aware of their students' tendencies to use rote-memorization without understanding in the course, but there was still a mis-alignment between how instructors' perceived their students' reasoning through EAS synthesis problems and the reasoning the students actually used. The instructors believed that their students would only rely on the directing effects of substituents in their reasoning, but the students demonstrated they were aware of the activating and deactivating effects too. Additionally, instructors believed their students would not be hindered by an understanding of resonance or Lewis structures in their syntheses.</div><div>Finally, there are some recommendations for addressing the students' propensity for rote-memorization by providing a visual way to represent directing and activating/deactivating effects of substituents using electrostatic potential maps. There are also suggestions for further building on this work. <br><div><br></div></div>

A pesquisa sobre formação de professores reconhece que existem conhecimentos fundamentais ao exercício da profissão. Neste trabalho adota-se a visão de que o Conhecimento Pedagógico de Conteúdo (PCK) é o elemento articulador da Base de Conhecimentos para o Ensino, o conhecimento central de um professor. No processo de formação inicial de professores de química, várias ações são conduzidas para o desenvolvimento dos conhecimentos necessários para a docência dos licenciandos, através das diferentes disciplinas e atividades, sendo ainda pouco pesquisada a influência da ação formativa dos formadores de professores na prática de ensino de química de seus licenciandos. Nesta investigação o foco é analisar a influência dos formadores de professores de um curso de Licenciatura em Química na prática de ensino dos licenciandos. O objetivo maior é apontar as relações entre a ação formativa dos formadores de professores e os conhecimentos mobilizados na prática de ensino por licenciandos em Química durante o curso de licenciatura. A pesquisa tem caráter qualitativo em que um estudo de caso múltiplo foi realizado com três licenciandos do curso de Licenciatura em Química de uma universidade pública do interior do estado do Paraná e seus professores formadores tendo por foco de ensino o conteúdo reações de oxirredução. Para tanto os dados coletados com os licenciandos foram baseados em questionários da literatura - Representação de Conteúdo (CoRe) - entrevistas, materiais utilizados nas aulas dos estágios curriculares sobre oxirredução, registros em diário de campo e relatórios de estágio. Os dados dos formadores foram baseados em entrevistas, CoRe, materiais didáticos dos professores e registros escritos das aulas. As entrevistas realizadas têm características do método biográfico bem como suas respectivas análises. O modo de compreensão empregado por Bourdieu para descrever as relações de poder e de reprodução de práticas dentro de um campo embasam as análises dos dados. A metodologia da Análise de Conteúdo foi utilizada com apoio do software ATLAS.ti na análise do conjunto de dados. Foi possível apontar indícios da influência dos formadores a partir da triangulação dos dados. Os resultados apontam para diferenças nas incorporações pelos licenciandos de elementos teóricos e aspectos da prática docente dos formadores, com características e conhecimentos distintos provenientes da prática dos professores das disciplinas das áreas de química e pedagógica. / Research on teacher education recognizes that there are basic knowledge to the profession. In this paper we adopt the view that the Pedagogical Content Knowledge (PCK) is the articulating element of the Knowledge Base for Education, the core knowledge of a teacher. In the process of chemistry teachers education, several actions are conducted to develop the knowledge necessary for teaching of undergraduates, across different disciplines and activities, but still little studied the influence of the formative action of teacher educators in the chemistry teaching practice of its undergraduates. The research focus is to analyze the influence of chemistry teacher educators actions in the teaching practice of its undergraduates The ultimate goal is to point out the relationship between the formative action of teacher educators and the knowledge mobilized during teaching practice for chemistry student teachers. The research is qualitative in that a multiple case study was conducted with three chemistry student teachers from a public university in the state of Paraná and their trainers by having as teaching focus the content redox reactions. Therefore the data collected with the undergraduates were based on literature surveys - Content Representation (CoRe), interviews, materials used in classes of internships on redox, field diary records and internship reports. Data from teachers formers were based on interviews, CoRe, educational materials for teachers and written records of the classes. The interviews as well as their respective analyzes have characteristics of biographical method. The analyzes of the data were based on the Bourdieu\' understanding to describe the relationships of power and the breeding practices within a field . The methodology of content analysis was used with support of the ATLAS.ti software in the analysis of the data set. It was possible to identify evidence of the influence of trainers on students teachers from the triangulation of data. The results point to differences in the incorporations done by undergraduates of theoretical elements and aspects of teaching practice from trainers, with distinct characteristics and knowledge derived from the practice of teachers of subjects in the fields of chemistry and pedagogy.

Uma série de pesquisas faz referência ao estudo do desenvolvimento dos conhecimentos necessários ao professor, englobando o conhecimento sobre o conteúdo, o conhecimento sobre a prática e o conhecimento sobre as diversas teorias de ensino e como fazer a relação teoria/prática. Com similar relevância, a discussão entre formação inicial e continuada vem sendo abordada no sentido de propor currículos de formação que possam contribuir cada vez mais para a formação de profissionais reflexivos. O conceito de Conhecimento Pedagógico do Conteúdo (PCK), inicialmente proposto por Shulman, está relacionado a um conjunto de saberes que vão além do conhecimento técnico do conteúdo, incluindo as formas de representações sobre o conteúdo e sua seleção, as exemplificações e analogias, as metodologias didáticas que podem ou não favorecer o aprendizado significativo deste ou daquele conteúdo. Esse conceito tem sido ampliado, desde o entendimento de Van Driel como conhecimento referido a um tópico particular do ensino juntamente com o conhecimento da experiência de como ensinar este tópico até o de Kind em que aponta o PCK como o conhecimento que os professores utilizam durante o processo de ensino. Neste trabalho investigamos o desenvolvimento do PCK de professores formados no curso de licenciatura em Química do Instituto de Química da Universidade de São Paulo e que hoje atuam como professores de química no ensino médio e superior. Nossos dados envolvem as atividades escritas, as gravações das aulas ministradas e as reflexões de três licenciandos que cursaram a disciplina Instrumentação para o Ensino da Química I, além de entrevistas e gravações em áudio de aulas de Química desses professores em seus contextos reais de sala de aula após um período que variou de três a cinco anos depois de formados. Utilizamos os instrumentos CoRe (Representação de Conteúdo) e PaP-eRs (Repertórios de experiência Profissional e Pedagógica) para documentar a prática desses professores e assim, reconhecer seu PCK. Para as análises utilizamos o Modelo de Raciocínio Pedagógico e Ação de Shulman e os tipos de conhecimento do modelo de Morine-Dershimer e Kent. Utilizamos também a ferramenta de análise de discurso proposta por Mortimer e Scott para identificar padrões de interação. Nesses professores, o desenvolvimento do PCK foi promovido durante a formação inicial através de experiência de planejamento e intervenção em sala de aula e atividades que buscaram estimular a reflexão sobre a ação. Os dados após três anos de experiência profissional revelam um incremento no PCK desses professores resultante da experiência em sala de aula e do processo reflexivo. A partir das análises realizadas, algumas implicações são fornecidas para a formação de professores de química. Apontamos para a necessidade de cuidar desse momento especial na trajetória dos professores - os anos iniciais de experiência profissional. Salientamos a necessidade de atuar nesse início de carreira, com grupos colaborativos, com intuito de contribuir mais diretamente para o desenvolvimento do PCK. / The literature refers to the study of the development of teacher knowledge, encompassing content knowledge, practical knowledge and the knowledge about different teaching-learning theories and how to deal with the theory/practice relationship. With similar relevance, the discussion about pre-service and in-service teacher education has been approached in order to propose teacher education curricula that can increasingly contribute to the reflective practitioners. The Pedagogical Content Knowledge (PCK), initially proposed by Shulman, is related to a set of knowledge that go beyond the content knowledge and include the content representation and their selection, the examples and analogies, the methodologies that may or not facilitate the meaningful learning of this or that content. This concept has been amplified, since then. Van Driel understands PCK as the knowledge related to a particular subject matter as well as the knowledge from practice in how to teach this topic. Moreover Kind´s conception points out the PCK as the knowledge teachers use during the teaching process. In this work we investigated the PCK development of trained teachers, graduated the course from Chemistry Institute of University of São Paulo and now work as teachers of chemistry both in high school or university. Our data involve written activities, the recordings of the classes and the reflections that three undergraduates taking the Methodology for Chemistry Teaching course (QFL 2505), as well as interviews and audio recordings of Chemistry lessons from these teachers in their real contexts of their classroom after a period of three to five years of graduation. We used the instruments CoRe (Content Representation) and PaP-eRs (Pedagogical and Professional experience Relatories) to document the pedagogical practice and then, recognize the teacher\'s PCK. We relate some aspects in the teacher discourse to the Model of Pedagogical Reasoning and Action from Shulman and to the teacher knowledge components from Morine-Dershimer and Kent. We also used the discourse analysis tool from Mortimer and Scott to identify teaching approaches and interaction patterns. In the investigated teachers, the development of PCK was promoted during pre-service teacher education through the experience of planning and intervention on classroom and reflection-on-action activities. Data after three years of professional experience reveal an improvement on this teacher PCK resulting from the classroom experience and the reflective process. From the analysis, some implications are pointed out for chemistry teacher education. We emphasize the special moment during teacher\'s professional development - the initial years of professional experience. We point out the importance of work with collaborative groups during the initial phase of teaching in order to contribute more directly to the development of teachers PCK.