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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.
181

An investigation into the sexual behaviours of adolescents attending sexually transmitted disease clinics in the western district of the Vaal region

Magagula, Mmamotlhoa Dolphin 04 1900 (has links)
Understanding the sexual behaviour patterns that can place the adolescent at risk for the development of sexually transmitted diseases is crucial in the HIV I AIDS epidemic era. An explorative descriptive survey was conducted among adolescents in the age group 14 to 19 years attending sexually transmitted disease services in the Vaal Region clinics. The purpose of the study was to explore the sexual behaviours of the adolescents and the impact the life style health education programme had on their sexual practices. Of the 89 respondents who attended the sexually transmitted disease clinic more than half were found to be engaging in sexual intercourse on a weekly basis. The study further revealed that the adolescents lacked in-depth information on sex and sexuality and expressed the need for change in the implementation of the adolescent life style health education programme. / Health Studies / M.A. (Nursing Science)
182

Benuttingswaarde van die Paradoksale teorie van verandering in gestaltspelterapie met adolessente

Dippenaar, Jacoline 30 November 2005 (has links)
Text in Afrikaans / The utilization value of the paradoxical theory of change in Gestalt Play Therapy with adolescents Adolescents undergo significant changes on physical, emotional, and cognitive levels during this development stage. These changes have a great influence on their self-awareness. Most adolescents experience great problems with who they are and who they should be according to the expectations of others. This causes a never-ending process of efforts to change. Change can only take place if the adolescent is who he is, but not if he tries to be what he is not. The consequence hereof is that change cannot take place in the adolescent, because he should first become aware of who he is. The awareness of who he is leads to change. The paradoxical theory of change is all about being who one is and not about trying to be what others expect one to be. The adolescent should be accompanied to become aware of who he is, by utilization of the paradoxical theory, in order to be able grow and change. The aim of this study was to explore and describe the utilization value of the paradoxical theory of change in Gestalt Play Therapy with adolescents. In order to achieve this goal, the research process was directed by qualitative research, and triangulation was utilized as a technique for gathering information. Out of the processing and integration of conclusions drawn during the empirical investigation, data could contribute to exploration and description of the assessment of the paradoxical theory of change in Gestalt play therapy with adolescents. The aim of the investigation was therefore achieved, namely the exploration and description of the utilization value of the paradoxical theory of change in Gestalt Play Therapy with adolescents. / Play thearapy / M.Diac.
183

Benutting van groepsterapie vir vroee adolessente dogters met portuurgroep-verhoudingsprobleme

Uys, Helga Louise 02 1900 (has links)
Text in Afrikaans / Papalia, Olds en Feldman (2008:419) noem dat die woord "adolessensie" van die Latynse woord "adolescere" afkomstig is. Dit beteken "om te groei in volwassenheid". In hierdie geval word adolessensie gesien as ʼn proses eerder as ʼn spesifieke tydperk in ʼn individu se lewe. Hierdie studie fokus op die adolessent, in die besonder die vroeë adolessente dogter en haar psigo-sosiale ontwikkeling. Spesifieke navorsing word gedoen oor die verhoudingsprobleme wat by die vroeë adolessente dogter gedurende die psigo-sosiale stadium van vroeë adolessensie voorkom, en die moontlikheid van groepsterapie as terapeutiese intervensie. Die benutting van groepsterapie, in die konteks van vroeë adolessente dogters met portuurgroep-verhoudingsprobleme, het die navorser geïnteresseer, weens haar ondervinding met kinders en spesifiek vroeë adolessente dogters met verhoudingsprobleme. Dogters is meer betrokke by hul verhoudings, hulle is meer uitgesproke in terme van hul emosies en benodig emosionele ondersteuning van hul portuurgroep, meer dikwels as wat seuns doen (Papalia et al. 2008:398). Sue, Sue en Sue (2006:579) skryf die toename in groepsterapie toe aan die feit dat baie sielkundige probleme interpersoonlik en intrapersoonlik van aard is. Verhoudingsprobleme binne groepe word dikwels die beste hanteer binne ʼn groep. / Papalia et al. (2008:419) state that the word "adolescence" comes from the Latin word "adolescere". It means "to grow in maturity". In this case, adolescence is seen as a process rather than as a specific time period in an individual's life. This study focuses on the adolescent, and in particular the early adolescent girl and her psychosocial development. Specific research is done on the relationship problems that occur during the development of the psychosocial stage of early adolescent girls and possible therapeutic interventions with the problem. The utilisation of group therapy, in the context of early adolescent girls and peer-relationship problems, interests the researcher, because of her experience with children and specifically early adolescent girls who are prone to peer-relationship problems. Girls are more concerned with their relationships; they are more outspoken in terms of their emotions and seek emotional support from their peers more often than boys do (Papalia et al.2008:398). Sue et al.(2006:579) attributes the increase in group therapy to the fact that many psychological problems are interpersonal and intrapersonal in nature. Relationship problems in groups are often best handled within the group. / Psychology of Education / M. Ed. (Voorligting)
184

Risky sexual behaviours among adolescents in a rural setting in Rustenburg

Moraope, Nompikeleko Doris 12 1900 (has links)
Early engagement in sexual activities amongst adolescents has become a worldwide concern, with studies finding them to begin as early as 12 or earlier (Booysen & Summerton, 2000; Dowsett & Aggleton, 1999). The behaviour becomes even more concerning when youths engage in sexual relationships which are considered as “risky”, that is, that put their health and wellbeing in danger. According to Trends (2010), such behaviour increases one’s risk of contracting sexually transmitted infections (STIs) and unintended pregnancies. Guided by Bronfenbrenner’s ecological model, this study investigated risky sexual behaviours amongst adolescents living in the rural areas. The motivation was twofold, namely: to change the behaviours and to strengthen school sexuality education programme. The study aligned itself to qualitative paradigm and adopted a case study design. Data was collected using focus interviews with 20 adolescents (10 boys and 10 girls) in the age range of 15-17 years, who were selected following purposive sampling. The findings revealed adolescents’ tendencies of engaging in risky sexual behaviours such as: sexual relationship with older people, involvement with multiple partners, unstable relationship, pornography, sex in exchange of money. Factors contributing to these behaviours include: limited sexuality education, parents not teaching about sexuality education, lack of good role models, poverty, and fear to disclose problems to teachers, ostentatious lifestyles, peer pressure, and myths about sex. Suggestions put forth for preventing involving risky sexual behaviours include: appropriate school programmes, good learner-teacher relationship, effective communication with parents, strengthening of the learning content of Life Orientation, discipline at home, good friends, closing down of illegal taverns, illegalising sex with young boys and girls and restricting access to pornography on the internet. In conclusion, I suggest that the problem be addressed ecosystematically. / Inclusive Education / M. Ed. (Inclusive Education)
185

Alcohol marketing and young people's drinking : the role of perceived social norms

Kenny, Patrick January 2014 (has links)
There has been substantial scientific debate about the impact of alcohol marketing on consumption. Relying mainly on econometric studies, the alcohol industry has traditionally maintained that alcohol marketing does not influence consumption, but is merely limited to brand level effects. Public health advocates, on the other hand, point to consumer-level research that shows a relationship between exposure to marketing and alcohol consumption, especially amongst the young. Recent longitudinal research has firmly established a causal relationship between alcohol marketing and alcohol consumption, giving the upper hand to the public health critics of alcohol marketing. The new consensus forged by these recent cohort studies has led to two separate, but related, debates. In the first instance, having answered the question of whether marketing influences drinking behaviour, there is a need to establish how and when such effects occur. Secondly, in the face of the mounting longitudinal evidence on the effects of marketing, representatives of the alcohol industry have sought to move the debate away from marketing by explicitly highlighting peer influence as a more significant causal factor in problematic youth alcohol consumption. This thesis tackles both of these new questions simultaneously by harnessing insights developed from social norms theory. An online survey (N = 1,071) was administered to undergraduates of the Dublin Institute of Technology in Ireland, and mediation relationships were tested with logistic and multiple linear regression methods as appropriate. Amongst other findings, the main contributions of this thesis are: (1) that marketing may play a key role in establishing perceived social norms around alcohol consumption, and that these perceived norms may act as an indirect pathway for the influence of marketing on behaviour and (2) that the association between alcohol marketing and consumption may increase as levels of engagement with marketing increase; this engagement appears to be at its most potent when marketing facilitates simultaneous interaction between the consumer, the brand and the consumer’s peers in an online social media environment. This thesis helps to move the field of alcohol marketing scholarship beyond questions of whether marketing influences alcohol consumption to how and when that influence occurs. By showing how peers may act as perpetuators and magnifiers of marketing influence it also undermines the argument that peers matter more than marketing, and suggests that peer norms can act as a powerful marketing tool.
186

Factors affecting grade 12 learners' performance in mathematics at Nzhelele East circuit : Vhembe District in Limpopo / Factors affecting grade twelve learners' performance in mathematics at Nzhelele East circuit

Sinyosi, Livhalani Bridget January 2015 (has links)
The quality of education in South Africa has come increasingly under scrutiny for various reasons and learners ‘performance in mathematics is one of the main areas of concern. Learners in secondary schools in Nzhelele East Circuit in Limpopo Province, South Africa, are not performing well in mathematics. Learners who want to pursue careers such as civil engineering, medicine and other qualifications where mathematics is a prerequisite find it difficult to follow these careers. The study used focus group discussions with 20 Grade 12 learners, face-to-face semi-structured interviews with six teachers and four SMT to investigate factors affecting grade 12 learners performance in mathematics in two secondary schools. The study highlighted socio-cultural and psychological factors that are seen to be barriers in mathematics performance. The purpose of this study was to explore factors that affect Grade 12 learners’ performance in mathematics. As there are many factors, this study's main emphasis was on the influence of the home environment, teachers’ competence and attitudes in teaching mathematics, learners’ attitudes towards mathematics and strategies that can be used to improve learners’ performance in mathematics. The afore-said were named themes each of which related to questions contained in the semi-structured interview schedule. The study included literature review from Kenya, Ghana and South Africa. Qualitative research method was used. Interviews were conducted with SMT, teachers and learners. The researcher set out to answer the following question What are the dominant and most profound socio-cultural and psychological factors of the Grade 12 mathematics learners affecting performance in the Nzhelele East Circuit, Vhembe District of Limpopo Province? The following points will also be taken into consideration during this research. How do learner performance trends in mathematics education look like among Grade 12 mathematics learners in the Nzhelele East Circuit, Vhembe District of Limpopo Province, and South Africa? What are the teacher-based factors established to have been contributory to the state of learner performance in mathematics in the selected participant schools? What are the School Management Team (SMTs) factors established to have been contributory to the state of learner performance in mathematics in the selected participant schools? THE AIMS AND OBJECTIVES Aim This study investigates the dominant and most profound socio-cultural and psychological factors affecting learner performance in mathematics among Grade 12 learners in the Nzhelele East Circuit, Vhembe District of Limpopo Province, and South Africa. Objectives The objective of this study was to explore the socio-cultural and psychological factors in the home and school environment that affect Grade 12 learners performance in mathematics at Nzhelele East Circuit, Vhembe District of Limpopo Province. Based on the above question the following were findings of the research. • Mathematics is believed to be a critical school subject in most regions of the world in general, and Sub-Saharan Africa in particular. • A plethora of governments – especially those in developing economies where governments are targeting industrialization and technological development believe mathematics is crucial for facilitating development and advancement of the general populace of their regions. • Mathematics is a compulsory subject in most education systems around the world. • There are a variety of complexities and constraints affecting the teaching and learning of mathematics in most regions of the world. • There is poor learner performance in mathematics. This is indicated by high failure rate in mathematics during end-of-year learner assessments. • The reasons for the poor performance of learners in mathematics in the selected schools were vast and intertwined. • Efforts have been made at international level to intervene with regard finding solutions to complexities and constraints affecting teaching-learning environment in mathematics. • The complexities and constraints affecting the teaching-learning environment of mathematics in South Africa stem from South Africa's past era of apartheid education. • Mathematics has been a major target of improvement and transformation by the post-apartheid government in South Africa. • Regardless of the efforts made by the post-apartheid government in South Africa to improve and transform teaching-learning environment in mathematics, there are perpetual complexities and constraints still hindering progress, and this affects learner output in mathematics. • Mathematics is one of the poorly performing subjects in the post-apartheid education system in South African schools – especially those schools which are based in formerly disadvantaged areas such as homelands and townships. • There is a growing body of literature investigating the complexities and constraints affecting the teaching-learning of mathematics in South Africa. Apart from the conclusions based on general observations, the study furthermore concluded that critical learner-based factors, teacher-based factors and SMT-base factors contributed to the state of affairs in the selected participant schools. This study therefore concluded thus: • Learner-based factors Mathematics learners were poorly prepared in the lower grades for senior grades. In other words, learners lacked proper foundation and background in mathematics. Learners were not well taught the basics of mathematics in previous grades. Furthermore, mathematics learners lacked assistance with homework for example because the majority of parents were illiterate and therefore not involved in supervision of learners beyond school environment. Learners showed negative attitude towards their teachers and the subject. Learners were not self-motivated in mathematics. • Teacher-based factors Teachers did not have enough workshops on how to teach mathematics, and also on content knowledge improvement. Less creative teachers were teaching mathematics. Teachers lacked support from their principals. The majority of teachers lacked passion in mathematics. • School Management Teams (SMTs) factors This study concludes that mathematics teachers were not receiving adequate support from the School management Teams (SMTs). Lack of teacher support by SMTs stems from poor organisation of supervisory roles expected from SMTs. Teachers' work is not being properly monitored and supervised. RECOMMENDATIONS Based on the conclusions drawn from the study, the following recommendations are crucial, and they have to be implemented: • Recommendations to the Department of Education This study recommends that the Department of Education should monitor or revisit the methods of teaching and learning of mathematics. Assessment should also be revisited to ensure that the mathematics paper is not too long for the learners during examinations. Enlisted service providers who facilitate teacher workshops for mathematics must be conversant with content requirements of mathematics. Considerations should be made to simplify the mathematics question paper. The Department of Education should also provide necessary resources such as textbooks timeously. Knowledgeable mathematics specialists and advisers could be enlisted to visit regular visits to schools to assist teachers and learners throughout the year. • Recommendations to the School Management Teams (SMTs) The SMT should ensure that their educators are adequately qualified to teach mathematics. as a subject as well as being able to teach their learners in a way that they understand the subject. In addition, teachers who are knowledgeable in teaching mathematics should be appointed to teach mathematics. The SMTs should also ensure that compulsory workshops are provided for mathematics teachers at school level. Furthermore, the SMTs should ensure that educators are able to identify learners that are under-performing, monitor the utilisation of study time and assist in resolving problems regarding the poor performance of such individual learners. School Management Teams shall facilitate additional after-hours lessons and sessions to assist learners identified as lacking in home environment assistance for example. Moreover, SMTs should also encourage all Grade 12 mathematics learners to participate in supervised extra mathematics lessons and extra-mural activities in order to develop and build their self-confidence and positive self-esteem. In addition, the SMT members should be more supportive to their mathematics teachers. Continuous moderation of teachers' work should be encouraged. School Management Teams (SMTs) should also develop motivational programmes and instruments to encourage and motivate learners in their respective schools. For example, performing learners could be awarded with prizes in public – especially during school organised functions which might include learners, teachers and parents. • Recommendations to the teachers The teachers should make it a point that they attended mathematics workshops as organised by various stakeholders. Teachers' interest in mathematics could be improved by improving their knowledge of subject content in mathematics, and personal recognition by authorities. Performing teachers could also be recognised and awarded with prizes publicly at school gatherings and meetings. Teachers should also be encouraged to obtain further qualifications and skills in mathematics. • Recommendations to the learners Efforts should be made to improve learners’ attitudes towards mathematics, and in addition to their mathematics teachers. Learners should be made aware of national target for mathematics education and the implications thereof. This could be achieved by utilizing educators – especially those who teach Guidance as a subject to learners to provide more convincing evidence of the spin-offs of obtaining good passes in mathematics in South Africa. SUGGESTION FOR AREAS NEEDING FURTHER STUDY There is a need to conduct follow-up research on: • applied strategies and instrument to improve learner attitude towards mathematics. • Establishing whether the complexities and constraints affecting learner performance in mathematics affect both girl and boy learners the same considering that their circumstances and conditions might materially differ. / Curriculum and Instructional Studies / M. Ed. (Curriculum Studies)
187

Voorkomingsprogramme vir middelmisbruik deur hoerskoolleerders : riglyne vir maatskaplike werkers

Kok, Elana 12 1900 (has links)
Thesis (MA(MW))--University of Stellenbosch,2004. / ENGLISH ABSTRACT: An exploratory study was done on prevention programmes of substance abuse by high school learners. This was done in order to: explore the factors leading to substance abuse by high school learners; explore the conditions for successful substance abuse programmes and compare it with existing programmes; and to determine how prevention programmes for high school learners can be used in South-African schools. The motivation for this study emerged as a result of the researcher’s involvement in prevention programmes for adolescents in schools and on farms at the South-African Council for Alcohol and Drug Dependency (SANCA) in the Paarl area. The objective of this study is to provide guidelines to social workers for the effective implementation of substance abuse prevention programmes for high school learners. The literature study confirmed the need for effective prevention programmes and highlighted the focus om the factors which leads to substance abuse. Emphasis is placed on risk and protection factors involved with substance abuse. SANCA in Paarl’s adolescent community’s risk and protective factors was investigated, because of the necessity to identify these factors before a prevention programme can be designed. The universum is the grade 10 learners of six schools in the Paarl area. One learner out of each class represented the sample of 48 respondents. The study was done trough a structured questionnaire. A combination of qualitative and quantitative information, through the use of open and close-ended questions, was gathered. The results of this study confirmed the results of the literature study, namely that the most important factor leading to substance abuse, is peer group influence. However, a combination of strategies and programmes are needed to develope a suitable programme for the specific community. The recommendations focus on four areas. Firstly the conditions are described for an effective prevention programme regarding the role of social workers, the use of assessment, evaluation, models, theories and approaches. Secondly, recommendations are made for techniques and general approaches. The third area gives directions for programme content. The last area recommends a possibility for future research: the process, roles and type of training needed to implement an effective and sustainable support group system in schools, must be tested. / AFRIKAANSE OPSOMMING: ’n Verkennende studie vir voorkomingsprogramme vir middelmisbruik deur ho¨erskoolleerders is gedoen ten einde: die faktore wat tot middele-misbruik deur ho¨erskoolleerders aanleiding gee, te ondersoek; die voorwaardes vir suksesvolle middele-misbruikvoorkomingsprogramme te verken en met bestaande programme in verband te bring; en te bepaal hoe voorkomingsprogramme aan ho¨erskoolleerders in Suid-Afrikaanse skole benut kan word. Die motivering vir die studie het gespruit uit die navorser se betrokkenheid by die Suid- Afrikaanse Raad vir Alkohol- en Dwelmafhanklikes (SANRA) met die aanbied van voorkomingsprogramme vir adolessente, op plase en in skole in die Paarl-omgwing. Die doel van hierdie studie is dus om riglyne vir maatskaplike werkers daar te stel vir die effektiewe implementering van voorkomingsprogramme vir middelmisbruik deur ho¨erskoolleerders. Die literatuurstudie het die behoefte aan effektiewe voorkomingsprogramme bevestig en die faktore wat lei tot middelmisbruik is ook uitgelig. Daar is veral gefokus op die risikoen beskermingsfaktore hierby betrokke. Die studie is ingelei deur ’n ondersoek na die risiko- en beskermingsfaktore wat ’n rol speel in die adolessente gemeenskap van SANRA (Paarl), aangesien dit noodsaaklik is om hierdie faktore te identifiseer voordat ’n voorkomingsprogram ontwerp word. Die universum is graad-10 leerders van ses skole in die gebied. Een leerder uit elke klas het die steekproef, van 48 respondente, verteenwoordig. Die ondersoek is aan die hand van ’n gestruktureerde vraelys gerig. Kwalitatiewe en kwantitatiewe inligting is deur middel van ’n kombinasie van oop en geslote vrae ingesamel. Die resultate van hierdie ondersoek het die literatuurstudie bevestig, naamlik dat die hoof faktor wat aanleiding gee tot middelmisbruik, portuurgroepinvloede is. ’n Kombinasie van verskeie strategie¨e is nodig om geskikte programme vir spesifieke gemeenskappe te ontwerp. Die aanbevelings fokus op vier areas, naamlik die voorwaardes vir ’n effektiewe voorkomingsprogram rakende die rol van die maatskaplike werker, die gebruik van assessering, evaluering, modelle, teorie¨e en/of benaderings en aanbevelings ten opsigte van tegnieke, programvoorstelle en programinhoud. Die vierde en laaste area maak ’n aanbeveling vir verdere navorsing: ’n Ondersoek na die proses, rol van en tipe opleiding nodig om ’n effektiewe en volhoubare ondersteuningsgroepstelsel in skole te implementeer.
188

Drugs, peers, gangs, and crime: an interactional model

Kwan, Ming-tak, Kalwan., 關明德. January 1995 (has links)
published_or_final_version / Social Work / Master / Master of Social Sciences
189

Exploratory Study of the Adoption and Use of the Smartphone Technology in Emerging Regions: Case of Saudi Arabia

Aldhaban, Fahad Abdulaziz 06 January 2016 (has links)
Users' acceptance of a new information technology (IT) is considered to be a key determinant factor of its success. Also, studying users' adoption and use of new IT plays an important role in determining users' needs and reducing business risk, especially in industry segments with rapid changes in IT such as Smartphone technology. Such rapid evolution is influencing consumers' behaviors, their daily lifestyle, the manner of conducting their activities and their ways of consuming and using information. Smartphone technology holds a promising future with an expected global market that could reach US $258 billion by the end of year 2015 [1]. Besides the mobile industry, Smartphone technology introduces a wide range of opportunities and challenges for many related industries that participate directly or indirectly in producing and providing Smartphone services/products to the end users. Moreover, the Smartphone technology is relatively new technology with plenty of room for improvement. Better understanding of users' intentions and their behaviors regarding the adoption and use of the Smartphone technology plays a critical role in determining its success and benefiting all stakeholders. Significant efforts have been made to study and explain users' adoption and use of Smartphone technology. However, most of the empirical research focused on only a limited number of Smartphone aspects or on a specific profession such as doctors and nurses which may neglect other important factors. In emerging regions such as Jordan and China, cultural and social influence showed significant relationships with users' adoption and use of the Smartphone and its related technologies. Saudi Arabia is a developing country that has different cultural and social contexts that could influence users' intention to adopt and use the Smartphone technology. The key factors that influence general users' intention to adopt and use Smartphone technology in Saudi Arabia have not yet been studied and explored in a comprehensive manner. Therefore, the main purpose of this dissertation is to empirically study and explore the key factors that influence general users' adoption and use of the Smartphone in a comprehensive manner in Saudi Arabia. This dissertation starts with a literature review of existing research related to the adoption and use of Smartphone technology. Taxonomy is developed that includes factors that were identified as important in previous research and related to the adoption and use of the Smartphone technology. By using the developed taxonomy and reviewing literature related to the IT adoption theories, a preliminary theoretical research model is developed based on the Unified Theory of Acceptance and Use of Technology (UTAUT). A number of qualitative methods, namely brainstorming, focus group and individual interviews, have been conducted to evaluate, select and validate the existing factors, as well as introduce new factors, and to identify only the most related factors to be included in the preliminary research model. A survey questionnaire has been developed and validated to survey general users of the Smartphone in Saudi Arabia. A web-based survey has been designed and sent through email to 5,000 randomly selected smartphones users in Saudi Arabia. Data has been statistically analyzed using Structural Equation Modeling (SEM). The results indicate that performance expectancy factor, effort expectancy factor, brand influence factor, perceived enjoyment factor and design factor have a positive and significant relationship with users' intention to adopt and use smartphones in Saudi Arabia. Also, the results indicate that the social influence factor has a significant and positive relationship with use behavior or actual use of smartphones in Saudi Arabia. The results of this dissertation provide more insights to practitioners in the smartphones domain and information that contributes to the body of knowledge regarding information technology adoption and its related research, especially in Saudi Arabia.
190

Les biens communs sans tragédie : effets de la pression sociale et des convictions

Bezault, Vincent 12 1900 (has links)
Pourquoi faire un effort pour la communauté sans rien recevoir en retour? C’est habituellement par conviction ou pour répondre à une norme sociale. En s’intéressant au problème du recyclage, nous définissons un modèle de comportement qui intègre ces deux facteurs. Nous déterminons sous quelles conditions un individu décide d’agir bénévolement, puis nous étudions comment ce comportement se propage dans la population. Cela nous permet de déduire comment un gouvernement doit pondérer ses efforts entre la publicité et la consigne pour tendre vers un taux de recyclage parfait au coût minimal. Nous prouvons aussi que dans certaines circonstances, il est préférable de ne pas encourager la participation au bien public. En effet, à mesure que plus de gens y participent, des tensions sociales émergent entre ceux qui font un effort et ceux qui n’en font pas. Celles-ci peuvent être assez fortes pour contrebalancer les bénéfices attendus du bien public / The commons need not be a tragedy: impact of peer-pressure and opinions Why do people help the community without getting anything in return? Usually, they either hold the firm belief they should do so or they want to follow a social norm. The behavioural model of this paper takes those two factors into account and applies them to recycling issues. It shows under which condition people act selflessly and how this behaviour spreads across the population. This paper then determines how governments must balance advertising and packaging refunding in order to increase recycling rate at minimal cost. It also proves that under certain circumstances it is preferable not to start transition toward cooperation. Indeed, as people progressively start cooperating, the population becomes divided between followers and opponents to this new attitude. As long as this heterogeneity remains, peer-pressure causes a cost that may outweigh the expected benefits of cooperation.

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