Different emotions and behaviors were examined in this study: Emotional Instability. Physicaland Verbal Aggression, and Prosocial Behavior. First of all, we analyzed the correlation betweenratings from different sources (children or teachers). Cultural differences were also discussedwith regards to a sample of 50 children and adolescents, 25 Peruvians and 25 Spanish.Data showed non-significan! differences in Aggressiveness between children and teachers' ratings.Nevertheless, the correlation is higher between Peruvian children and teachers than betweenSpanish ones. On the other hand, Peruvian teenagers showed higher levels of EmotionalInstability whereas the Spanish got higher average ratings in Prosocial Behavior and Aggressiveness.These data could be due to cultural differences. / En este trabajo se estudian distintas emociones y comportamientos: Inestabilidad Emocional, Agresividad Física y Verbal, y Conducta Prosocial. En primer lugar, se analizan las correlaciones entre las puntuaciones pertenecientes a las distintas fuentes informantes (jóvenes y profesores). Se comparan también las diferencias entre distintas culturas (española y peruana). La muestra está compuesta por 50 niños y adolescentes; 25 peruanos y 25 españoles. Los datos muestran que, en Agresividad, no hay diferencias significativas entre las puntuaciones de los jóvenes y los maestros. Sin embargo, aparece una mayor correlación entre jóvenes y profesores peruanos que entre jóvenes y profesores españoles. Por otro lado, los adolescentes peruanos tienen niveles más elevados en Inestabilidad Emocional, mientras que los españoles alcanzan puntuaciones medias más altas en Conducta Prosocial y Agresividad. Estas diferencias entre los grupos pueden estar motivadas por factores culturales.

Orientador: Orly Zucatto Mantovani de Assis / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Educação / Made available in DSpace on 2018-08-13T20:23:08Z (GMT). No. of bitstreams: 1 Carina_SandraCristina_D.pdf: 883383 bytes, checksum: 03d3d88c1e105e3e3b78767b3dab991e (MD5) Previous issue date: 2009 / Resumo: O cotidiano escolar é permeado por inúmeros conflitos interpessoais entre crianças e adolescentes. São situações muitas vezes julgadas como negativas pelos educadores, como algo a ser evitado. Não raro, os educadores distanciam-se de entender que suas formas de intervenção são geradoras de comportamentos submissos por parte de seus alunos. Tais comportamentos são oriundos de um ambiente em que o professor normalmente utiliza formas autoritárias para resolver os problemas que enfrenta no cotidiano escolar, colocando, muitas vezes, seus alunos em situações de humilhação, exposição, ou pura obediência a uma autoridade, sem que esses sejam convidados a pensar nas soluções que levem em conta as necessidades dos envolvidos, ou seja, em estilos assertivos de resolução de conflitos. Diante de tal justificativa, a presente pesquisa buscou investigar quais formas de resolução de conflito são comumente utilizadas pelos adolescentes, ainda que a partir de dilemas hipotéticos, e confrontá-las às formas que os professores apontaram como as que esses mesmos adolescentes utilizavam quando envolvidos em situações de conflitos. A amostra foi constituída por um total de trinta e nove participantes, préadolescentes entre onze e treze anos, estudantes do sexto ano de uma escola pública da região de Campinas, interior de São Paulo, e por cinco professores desses mesmos adolescentes. O instrumento utilizado consistiu numa entrevista semi-estruturada com professores e um instrumento criado por Robert Deluty e adaptado por Maria Isabel Leme que avalia simultânea e comparativamente três tipos de tendências de resolução de conflitos interpessoais - agressivo, assertivo e submisso - nas respostas dos pré-adolescentes a conflitos interpessoais hipotéticos cujos conteúdos sejam de provocações, perdas, frustrações etc. Os resultados obtidos nos permitem comprovar nossa hipótese de que a forma pela qual os adolescentes nas situações hipotéticas resolvem seus conflitos não coincide às formas apontadas previamente pelos professores das tendências de resolução de conflitos utilizadas por esses mesmos adolescentes quando envolvidos em situação de conflito no cotidiano escolar. Esses adolescentes estão mais propensos a estilos submissos de resolução de conflito do que a formas assertivas ou agressivas. / Abstract: The daily school life is permeated by a lot of interpersonal conflicts among children and adolescents. These situations are often judged as negative by educators, like something to be avoided. Sometimes educators don't make an effort to understand that their forms of intervention are generating submissive behaviors from their students. Such behaviors are derived from na environment where the teacher usually uses authoritari/an ways to solve the problems faced in the daily school life, putting their students in situations of humiliation, exposure or pure obedience to the authority, without letting them think about the solutions that take into account their needs, I.e., in assertive styles of conflict resolution. From such reason, this research tried to investigate what forms of conflict resolution are commonly used by adolescents, even from hypothetical dilemmas, and face them to the ways that teachers identified as being the ones that adolescents used in conflict situations. The sample consisted in a total of thirty-nine participants, preadolescents from eleven to thirteen years old, students in the sixth year of a public school in Campinas, countryside of São Paulo, and five teachers of these adolescents. The instrument used was a semi-structured interview with teachers and an instrument created by Robert Deluty and adapted by Maria Isabel Leme that evaluates simultaneously and comparatively three types of trends of interpersonal conflicts resolution - aggressive, assertive and submissive - in the responses of pre-adolescents to hypothetical interpersonal conflicts whose contents are of provocations, losses, frustrations etc. The results allow us to prove our hypothesis that the way adolescents in hypothetical situations solve their conflicts does not coincide with those pointed out by the teachers. These adolescents are more prone to submissive styles of conflict resolution that assertive or aggressive ways. / Doutorado / Psicologia Educacional / Doutor em Educação

Submitted by Renata Lopes (renatasil82@gmail.com) on 2016-05-20T19:43:49Z No. of bitstreams: 1 tatianearchanjodesales.pdf: 1871876 bytes, checksum: 6bdeefe279a3c1e633ba1cbae84bdf3c (MD5) / Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2016-07-02T11:28:21Z (GMT) No. of bitstreams: 1 tatianearchanjodesales.pdf: 1871876 bytes, checksum: 6bdeefe279a3c1e633ba1cbae84bdf3c (MD5) / Made available in DSpace on 2016-07-02T11:28:21Z (GMT). No. of bitstreams: 1 tatianearchanjodesales.pdf: 1871876 bytes, checksum: 6bdeefe279a3c1e633ba1cbae84bdf3c (MD5) Previous issue date: 2012-02-23 / FAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais / Buscando identificar os mecanismos formadores das assembleias de formigas em campo rupestre, este estudo foi dividido em três partes. A primeira investigou a habilidade das espécies em descobrir recursos alimentares e a influência dos comportamentos na sua permanência nos mesmos. Iscas atrativas foram oferecidas em uma área de campo rupestre no Parque Estadual do Ibitipoca, MG. Foram realizados 60 registros, referentes a 10 iscas/quadrante, totalizando 40 horas de filmagem. Das nove espécies mais freqüentes Pheidole obscurithorax, Pheidole radoszkowskii, Pheidole sp.6 e Crematogaster sericea foram as que apresentaram maiores valores para habilidade de descoberta e tenderam a permanecer por mais tempo nas iscas; Camponotus crassus, Camponotus renggeri, Ectatomma edentatum, Camponotus genatus, Pachycondyla striata foram espécies com menores taxas de permanência, podendo ser consideradas como submissas devido à menor habilidade competitiva. Os comportamentos também influenciaram na permanência e variaram entre agonísticos e de coexistência em função da espécie e do contexto no qual ocorreu a interação. As duas espécies com maior habilidade em descobrir os recursos - C. sericea e P. obscurithorax - foram selecionadas para a segunda parte do estudo. Objetivando avaliar mecanismos competitivos em locais distantes e próximos aos seus ninhos, foi averiguada a influência da distância do recurso ao ninho na agressividade e abundância, bem como o status hierárquico durante o forrageamento. Foi estabelecido um plot de observação para cada ninho composto por oito iscas: quatro localizadas a 1,5m de distância dos ninhos e quatro a 0,5m. As iscas foram observadas uma por vez, totalizando 256 registros/espécie. Os comportamentos registrados foram ataque e avançar. Para ambas as espécies a distância do alimento ao ninho não influenciou na agressividade (Z= 1,44; p=0,07 C. sericea; Z= 1,44; p=0,07 P. obscurithorax); a abundância de P. obscurithorax foi maior nas iscas próximas ao seu ninho (F= 7,30; p<0,01), enquanto que para C. sericea não diferiu entre iscas próximas e distantes (F=2,19; p=0,14). Apesar de fortes competidoras, C. sericea e P. obscurithorax forragearam de acordo com seus status hierárquico, sendo a primeira territorialista e a segunda agressiva não territorialista. Na terceira parte foram investigados os padrões comportamentais de agressividade entre colônias de C. sericea e P. obscurithorax localizadas próximas (2,40m) e distantes (15,60m) entre si baseado na Hipótese do Inimigo Querido. Foram capturados 50 indivíduos/colônia para execução de encontros diádicos. Foram realizados 10 encontros/tratamento: controle, interespecífico próximo e interespecífico distante. Os comportamentos observados foram: inspeção, toque de antena, auto-grooming, viii evitar, avançar, abertura de mandíbula, morder, curvar o gáster e luta. Para cada ato foi atribuído um valor, utilizado no cálculo do índice de agressão. Verificou-se maior agressividade de C. sericea quando confrontadas com P. obscurithorax provenientes da colônia próxima (t=-4,935; p<0,001). Em contraste, não houve diferença significativa na agressividade exibida entre operárias de P. obscurithorax e C. sericea provenientes da colônia distante (t=0,617; p=0,995). A agressividade de C. sericea direcionada aos seus vizinhos atesta que, além de haver o reconhecimento entre diferentes espécies, P. obscurithorax pode ser considerada uma forte competidora, não sendo aplicável a hipótese do inimigo querido a estas espécies. / In order to identify the mechanisms that form the ant assemblages in the rupestrian, this study was divided into three parts. In the first was investigated the species ability to find food resources and the behaviors influence of their permanence in the same resources. Baits were offered in a rupestrian area in Parque Estadual do Ibitipoca, MG. Were made 60 records, on a 10 baits/quadrant, totaling 40 hours of recording. Of the nine most common species Pheidole obscurithorax, Pheidole radoszkowskii, Pheidole sp.6 and Crematogaster sericea showed highest values for discovery ability and tended to stay longer in the baits. Camponotus crassus, Camponotus renggeri, Ectatomma edentatum, Camponotus genatus, Pachycondyla striata were species with lower permanence rates, may be considered as submissive species due to lower competitive ability. The behavior also influenced the permanence and ranged between agonistic coexistence depending on the species and the context in which the interaction occurred. The two species with greater ability to find resources – P. obscurithorax and C. sericea – were selected for the second part of the study. In order to evaluate competitive mechanisms in places far and near to their nests, has been investigated the influence of distance from the resource until the nest in the aggression and abundance, and the hierarchical status during the foraging. We established an observation plot for each nest, composed by eight baits: four located 1.5m away from the nests and four 0.5m. The baits were observed one at a time, totaling 256 records/species. The behaviors recorded were attack and advance. For both species, the distance of the food to the nest had no effect on aggression (Z= 1,44; p=0,07 C. sericea; Z= 1,44; p=0,07 P. obscurithorax); the abundance of P obscurithorax was higher in the baits near its nest (F = 7.30, p <0.01), while for C. sericea did not differ between near and far baits (F=2,19; p=0,14). In spite of being strong competitors, C. sericea and P. obscurithorax foraged according to their hierarchical status, being the first territorialist and the second aggressive not territorialist. In the third part, we investigated the behavioral patterns of aggressiveness among C. sericea and P. obscurithorax colonies located near (2.40 m) and far (15.60 m) from each other based on the Dear Enemy Hypothesis. We captured 50 individuals/colony to perform dyadic encounters. Were conducted 10 meetings/treatment: control, near interspecific and far interspecific. The behaviors observed were: inspection, antenna touch, self-grooming, avoidance, forward, open jaw, bite, bend the gaster and fight. For each action was assigned a value, used to calculate the aggression rate. Was found more aggressiveness of C. sericea when confronted with P. obscurithorax from the nearby colony (t=-4,935; p<0,001). In contrast, there were no significant difference in x aggressiveness displayed between workers of P. obscurithorax and C. sericea from the far colony (t=0,617; p=0,995). The aggressiveness of C. sericea directed to their neighbors certifies that, in addition to the recognition between different species, P. obscurithorax also can be considered a strong competitor, then Dear Enemy Hypothesis cannot be applicable to these species.

Submitted by Renata Lopes (renatasil82@gmail.com) on 2016-09-08T12:02:00Z No. of bitstreams: 1 deyseaparecidaribas.pdf: 614073 bytes, checksum: db6755873fc8af90754fc8898e117931 (MD5) / Approved for entry into archive by Diamantino Mayra (mayra.diamantino@ufjf.edu.br) on 2016-09-09T10:50:54Z (GMT) No. of bitstreams: 1 deyseaparecidaribas.pdf: 614073 bytes, checksum: db6755873fc8af90754fc8898e117931 (MD5) / Made available in DSpace on 2016-09-09T10:50:54Z (GMT). No. of bitstreams: 1 deyseaparecidaribas.pdf: 614073 bytes, checksum: db6755873fc8af90754fc8898e117931 (MD5) Previous issue date: 2011-09-20 / A teoria da mente, entendimento que as crianças elaboram acerca da mente, incluindo-se emoções, intenções, desejos e crenças, permite predizer o comportamento e formular o entendimento do mundo social. A compreensão das emoções, um dos aspectos constituintes da teoria da mente, também influencia o conhecimento sociocognitivo e parece estar intimamente ligada à trajetória de desenvolvimento social e ao ajustamento escolar. Tal constatação leva a indagar sobre como se daria a compreensão das emoções nas crianças que apresentam um tipo de comportamento diferenciado, como o comportamento agressivo. A presente pesquisa objetivou investigar a relação entre a teoria da mente – especificamente a compreensão das emoções – e o comportamento agressivo. Buscou-se compreender a relação entre compreensão das emoções e agressividade em crianças do ensino fundamental por meio da comparação entre as crianças que apresentam indicadores de comportamento agressivo e as que não apresentam tais indicadores. Participaram do estudo 115 crianças de ambos os sexos, alunos do primeiro ano do ensino fundamental de duas escolas da rede municipal de ensino da cidade de Juiz de Fora. Desta amostra inicial, selecionou-se um subgrupo de 60 crianças – 30 alunos identificados como socialmente competentes e 30 alunos com indícios de comportamento agressivo, assim identificados por seus professores por meio da Escala de Percepção por Professores dos Comportamentos Agressivos de Criança na Escola. As crianças de ambos os grupos foram avaliadas quanto ao desenvolvimento da teoria da mente, pela Escala de Tarefas em Teoria da Mente, e quanto à compreensão das emoções por meio do Teste de Inteligência Emocional para Crianças. Os resultados obtidos evidenciam uma relação entre teoria da mente e desenvolvimento social e indicam a influência da habilidade de compreensão das emoções para o ajustamento socioemocional infantil. Verificou-se diferença estatisticamente significativa entre os dois grupos quanto à teoria da mente – na tarefa de Acesso ao Conhecimento e no escore geral da Escala – e quanto à compreensão emocional – no subcomponente Compreensão e Análise de Emoções. De forma geral, as crianças identificadas como não agressivas tenderam a apresentar uma teoria da mente e compreensão emocional mais sofisticadas, quando comparadas às crianças com indícios de comportamento agressivo. / The theory of mind, understanding children elaborate about the mind, including emotions, intentions, desires and creed, let it predict their behavior and formulate the understanding of the social world. The emotion understanding, one of the founding aspects of the theory of mind, also influences the social-cognitive knowledge and seems to be closely connected to the social development path and scholar adjustment. Such constatation make us question about how emotion understanding would be on children that shows differentiated behavior, like aggressive behavior. This research aimed to explore the relations between the theory of mind – specifically the emotion understanding – and the aggressive behavior. It also aimed the understanding of the relation between emotion understanding and aggressiveness in children in fundamental school using comparisons between children that shows signs of aggressive behavior and children that don't show such signs. One hundred fifteen children on their first grade at two Juiz de Fora's fundamental school, both male and female, took part on the study. Among this initial sample, a subgroup of 60 children was selected – 30 students were identified by their teachers as socially suitable and 30 students were identified with aggressive behavior signs by the Escala de Percepção por Professores dos Comportamentos Agressivos de Criança na Escola. Children of both groups were evaluated regarding their development of the theory of mind, by the Scaling of Theory of Mind Tasks, and regarding their emotion understanding by the Teste de Inteligência Emocional para Crianças. The results showed a relation between the theory of mind and social development and pointed the influence of the emotion understanding ability level for the infant social-emotional adjustment. A significant statistical difference between the two groups regarding to the theory of mind was verified on the task of Knowledge Access and the Scale's final general score – regarding the emotional comprehension – on the sub-component Compreensão e Análise das Emoções. On a general level, children identified as non-aggressive tended to show the theory of the mind and emotional comprehension more accurate than children with signs of aggressive behavior when they were compared.

Orientadores: Carmen Veríssima Ferreira Halder, Ronaldo Aloise Pilli / Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Biologia / Made available in DSpace on 2018-08-23T09:59:14Z (GMT). No. of bitstreams: 1 Pelizzaro-Rocha_KarinJuliane_D.pdf: 18909118 bytes, checksum: fa9cec97e3d81e8fb670dab95bc1bc4d (MD5) Previous issue date: 2013 / Resumo: O resumo poderá ser visualizado no texto completo da tese digital quando liberada / Abstract: The abstract is available with the full electronic document when available / Doutorado / Bioquimica / Doutora em Biologia Funcional e Molecular

Ph.D. / Aggression during adolescence has a long term effect on the mental health of adolescents. This is a great reason for concern. Although society is intensely aware of the incidences of aggression within South African schools, little research is available regarding this issue. Learners with special educational needs, and specifically learners with cerebral palsy, have been even more neglected in this regard. This study evolves from the field work of the researcher’s M.Ed. dissertation in which the experience of aggression in adolescent boys with cerebral palsy was explored and described. The aim of this study is to develop, describe, implement and evaluate a psycho-educational model as a frame of reference for the facilitation of constructive management of aggression in adolescent boys that live with cerebral palsy. A theory generating research design was used to fulfil this purpose. The development of this model consisted of four steps. Step one consisted of the concept analysis. Facilitation, constructive and management were identified as the central concepts. As part of the concept analysis these concepts were defined and essential and related criteria were discussed. All the concepts and criteria were then summarised in a comprehensive definition. A model case was constructed before the concepts were classified. During the process of classification a heightened self-awareness was identified as the terminus of the process. During step two relationship statements were drawn between the different concepts. These relationship statements as a whole provide substance and structure to the theory. In step three the psycho-educational model as a frame of reference for the facilitation of constructive management of aggression in adolescent boys with cerebral palsy was described. The structure of the model was described in terms of its purpose, assumptions and the context of the model.

The purpose of this study was to gain a better understanding of sexually aggressive behavior through the examination of humor appreciation among male undergraduates. As compared to nonaggressive males, sexually aggressive males showed a significantly greater appreciation for humor which negatively stereotyped females, portrayed prejudicial views of rape-and rape victims, and contained content related to male sex drive and virility. Differences in humor appreciation were also found for males with high sex drive. Additional findings included correlations between aggressive drive and sexually aggressive status, as well as between sex drive and likelihood to rape.

Syfte: Syftet med denna studie är att undersöka om det finns ett negativt samband mellan hållbarhetsredovisning och skatteaggressivitet.     Metod: Studien har utgått ifrån en positivistisk forskningsfilosofi och har antagit en hypotetisk-deduktiv ansats. Studien är av en kvantitativ art där en tvärsnittsdesign används och där det data som använts varit sekundär. Studiens urval har bestått av totalt 120 företag efter bortfall där Sverige och Schweiz har 60 företag var. All data har samlats genom användandet av Thomson Reuters Datastream och har därefter behandlats i statistikprogrammet SPSS för att kunna göra en logistisk regressionsanalys.   Resultat &amp; slutsats: Studiens resultat visar inte på något negativt samband mellan hållbarhetsredovisning och skatteaggressivitet. Tvärtom ser vi ett positivt samband men inte på en statistisk signifikant nivå för att kunna förkasta noll-hypotesen.   Förslag till fortsatt forskning: Då denna studie är av tvärsnittsdesign ger resultatet endast en insikt om läget i dessa länder under det aktuella året. Ett förslag vi lämnar till fortsatta studier inom ämnet är därför att göra en studie över tid, för att få en tydligare bild över ett eventuellt samband mellan hållbarhetsredovisning och skatteaggressivitet.   Uppsatsens bidrag: Denna studie bidrar med ytterligare kunskap i forskningen kring CSR och skatteaggressivitet. Den bidrar framförallt med att fylla ett hål genom att titta på företag i europeiska länder, närmare bestämt Sverige och Schweiz. / Aim: The purpose of this study is to examine if there is a negative relation between sustainability reporting and tax aggressiveness.   Method: The study is based in a positivist research philosophy and adopts a hypothetical-deductive approach. The study is of a quantitative kind where a cross-sectional design and secondary data have been used. The study’s sample is 120 companies where Sweden and Switzerland has 60 companies each. All data has been gathered through the use of Thomson Reuters Datastream and have been processed in the statistic program SPSS in order to do a logistic regression analysis.   Result &amp; Conclusions: The result of this study does not show a negative relation between sustainability reporting and tax aggressiveness. On the contrary we can see a positive relation but not on a statistically significant level to be able to reject the null hypothesis.   Suggestions for future research: This study is using a cross-sectional design which means that the result in the study can only be applied to the year the data was collected. A suggestion for future research within the subject is to do a study over time, to be able to get a better picture of a potential connection between CSR and tax aggressiveness.   Contribution of the thesis: This study contributes with knowledge in the research field of CSR and tax aggressiveness. It especially contributes by filling a gap in the research area by looking at companies from European countries, more particularly Sweden and Switzerland.

Years of political unrest, forced removals, migrant labour and overly rapid urbanisation have had a negative effect on the lives of many South Africans and poverty, unemployment and the HIV/AIDS pandemic have increased the challenges facing young people in South Africa. With 54 per cent of South Africa’s population younger than 24 years and two-thirds of South Africans between the ages of 18 and 35 years unemployed, youth development is an urgent and critical social investment. Current research stresses the importance of an integrated and developmental approach that recognises young people’s optimism and resilience and builds on their strengths. Of the various youth developmental interventions being implemented in African countries, including South Africa, an initiative that is being used increasingly, is the international broad-base programme known as the Alternatives to Violence Project (AVP). Using an experiential approach honed by over 35 years’ of working mostly in prisons in more than 35 countries, AVP teaches the attitudes and strategies (such as self-awareness, empathy and community-building) needed to transform conflict nonviolently and addresses the important psychological need for intimate connection with others. This study investigates how the experience of an AVP workshop can influence so-called ‘at-risk’1 young South African adults’ perceptions of personally-experienced conflict situations. The study was conducted in partnership with a local youth development project and used a narrative analysis approach to explore the pre- and post-AVP workshop conflict narratives of a group of Xhosa-speakers from the Eastern Cape. To support the analysis of the conflict narratives, focus groups were conducted three months later and again after six months with a selected sample of volunteers. Participation in the study was wholly voluntary and by informed consent.

Cette thèse étudie les typologies des stratégies relationnelles que peuvent entretenir les firmes avec leurs concurrentes dans une industrie de réseau : la téléphonie mobile. Elle se donne aussi pour objet de mettre en évidence les déterminants de ces choix stratégiques ; ainsi que leur implication. Elle vise enfin à effectuer une comparaison des performances des firmes en fonction des choix de stratégies relationnelles. Pour aborder ces préoccupations, nous avons eu recours, d'une part à la méthode d'analyse de contenu structuré, afin d'identifier les mouvements stratégiques des opérateurs mobiles de pays et régions géographiques différents ; d'autre part à deux méthodes (exploratoire et confirmatoire) d'analyse et de traitements des données. A travers cette thèse, nous mettons en évidence trois résultats principaux : Le premier résultat montre que l'agressivité concurrentielle, la coopérativité et la coopétition sont les stratégies relationnelles viables dans le secteur de la téléphonie mobile. Le second résultat majeur montre que des variables sectorielles telles que la concentration industrielle, la maturité sectorielle ou la plus ou moins forte présence à l'international apparaissent comme des facteurs déterminant les comportements stratégiques (agressif, coopératif et coopétitif) des opérateurs mobiles ; de même que plus d'agressivité et plus de coopérativité conduisent à de meilleures performances. En dernier lieu, il est montré dans cette recherche que la performance de la firme varie en fonction de la stratégie adoptée (agressivité, coopérativité ou coopétitivité) par l'opérateur mobile, mais aussi en fonction de son implantation géographique. / This thesis examines the types of relational strategies that firms can adopt with their competitors in a network industry : the mobile phone industry. It also purposes to highlight the determinants of these strategic choices and their implication. Finally, it aims to make a comparison of the performances of firms, according to their relational strategies choises. To address these concerns, we used, on one hand the method of structured content analysis so as to identify the strategic movements of the mobile phone operators of different countries and geographical areas ; on the other hand, we used two methods (exploratory and confirmatory) analysis for data processing. Through this thesis, we highlight three key findings : The first result shows that competitive aggressiveness, cooperativeness and coopetition are the viable relational strategies in the mobile phone industry. The second major result shows that the sectorial variables such as industrial concentration, sectorial maturity ; or more or less international presence appear to be factors determining the strategic behavior (aggressive, cooperative and coopetitive) of the mobile operators ; as well that more aggressiveness and more cooperativeness lead to better performance. Finally, it is shown in this study that the performance of the firm depends on the strategy (aggressive, cooperative, or coopetitive) adopted by the mobile operator, but also on its geographical location.