Cette thèse a pour but d'étudier les méthodes d'évaluation des ressources environnementales : la méthode des Coûts de Transport (CT) à préférences révélées et la méthode d'évaluation contingente (EC) à préférences déclarées afin de proposer les contributions suivantes. Dans le chapitre 1, nous montrons qu'il est possible si les données sur les deux méthodes sont disponibles pour les mêmes observations, d'obtenir une meilleure mesure de la disposition à payer (DAP) par la combinaison des deux méthodes en utilisant la technique du maximum de vraisemblance simulé. Dans le chapitre 2, nous montrons qu'une nouvelle approche: le "special regressor" pourrait être une solution pour traiter les problèmes d'endogénéité en EC. En utilisant des données sur la DAP pour réduire les risques subjectifs de mortalité due à la présence d' Arsenic dans l'eau potable , nous montrons que le problème d'endogénéité du niveau subjectif de risque de mortalité peut être réglé efficacement. Enfin dans le chapitre 3, en utilisant une nouvelle enquête sur l'électrification rurale au Rwanda, nous proposons un nouveau design de la méthode d'EC en permettant aux personnes interrogées de choisir entre une contribution en temps ou en argent. Ainsi, en plus de mesurer une DAP classique, nous obtenons aussi une disposition à contribuer du temps mesurée en jours, qui est une mesure aussi voire même plus pertinente que la DAP dans le contexte d'un pays en développement. / This dissertation aims at investigating the methods of the environmental resources valuation: revealed preferences Travel Cost (TC) method and stated preferences Contingent Valuation (CV) method in order to propose the following contributions. In chapter 1, we show that it is possible if both CV and TC data are available for the same observations, to obtain a better measure of willingness to pay (WTP) by combining the two methods using Simulated maximum Likelihood technique. In chapter 2, we show that the new special regressor approach could be a solution to treat endogeneity issues in CV. Using data on WTP for reducing subjective mortality risks due to arsenic in drinking water, we show that the endogeneity of the subjective mortality risk level can be treated effectively. Finally in chapter 3, using a new survey about rural electrification in Rwanda, we propose a new design for the CV method by allowing people to choose between a contribution in time or in money. Thus, in addition to measure a conventional WTP, we also obtain a willingness to contribute time measure which is as or even more relevant than WTP in the context of a developing country.

The main purpose of the diploma thesis is to determine the willingness of people visiting the Eastern Slovak dam Ružín to pay for improving water quality, namely for the environmental good. Willingness to pay is determined by questionnaire investigation the contingent valuation method. Dam is a public good, which has no owner. We all use it without someone to care for it. This use is not positive, but negative in terms of pollution, clogging of toxic sediments. The theoretical part is devoted to construction and the need to build dam as well as environmental problems, which occur at the dam. This is related to the problem of public good and "the tragedy of the commons." There are the contingent valuation method and development of the questionnaire described at the end of theoretical part. The practical part consists of the evaluation questionnaire investigation and the linear regression model in terms of the parameters under which they were created identifiers variables and point estimates. Finally, it is converted by statistical analysis of the impact of variables on the amount that people are willing to pay.

Le regroupement des clubs sportifs amateurs est une mise en commun partielle ou totale des ressources de ces clubs. S'il a le plus souvent été au centre des recherches scientifiques effectuées dans le milieu des entreprises, le regroupement n'a jusque-là été que partiellement évoqué dans ces études concernant le milieu sportif. Cette étude vise à sortir les regroupements de clubs sportifs amateurs de l'anonymat en permettant leur compréhension. Il s'agit, suivant une approche pluridisciplinaire (sociologie, management et économie des organisations sportives) de connaitre le phénomène de regroupement de clubs sportifs amateurs. C'est questionner les facteurs à l'origine des regroupements, c'est aussi scruter la mise en oeuvre de telles décisions et c'est enfin, sonder leurs conséquences sur la vie quotidienne du club sportif. Nous avons donc soigneusement inspecté, les enjeux organisationnels de ces regroupements, leurs modalités et processus, les stratégies et logiques d'action des principaux acteurs et les conséquences de ces regroupements sur la vie quotidienne du club. Notamment, sur le plan culturel et identitaire, économique et sportif, et sur le plan de la gouvernance au sens de Gérard Charreaux (1997). Les données recueillies selon une méthode inductive sont principalement des observations et des entretiens, secondairement des coupures de presse et documents internes aux clubs et FFA. Dix entretiens formels d'une moyenne de cinquante minutes chacun et une centaine d'entretiens informels, conçus dans un esprit de complémentarité et de recoupement. Vingt-cinq numéros du journal Le Progrès de 1999 à 2015, soit environ cinquante pages de coupure de presse sur les regroupements de clubs. Les comptes rendus d'AG, de CD, de réunions d'entraîneurs, tout comme les statuts et règlements spéciaux des clubs et de la FFA ont constitué l'essentiel des documents internes. Le traitement de ces données s'est fait selon le triptyque : analyse qualitative de contenu par théorisation ancrée-analyse stratégique de l'acteur-théorie de la contingence, selon respectivement, Pierre Paillé-M. Crozier & E. Friedberg-Henry Mintzberg. Les regroupements de clubs d'athlétisme présentés dans notre recherche, au-delà d'avoir deux modalités principales, ententes et fusions, sont un construit collectif et local, intéressés, instables et institutionnalisés. Cinq grands groupes de facteurs contingents poussent le club vers le regroupement : les objectif et effectifs du club, leur modernisation, le développement de la pratique et de la politique sportive locale. Dans ce contexte de regroupement de clubs, la latitude managériale du dirigeant de club reste conditionnée à plusieurs niveaux, notamment, celui de la collectivité territoriale et de la FFA. Notre recherche, permet d'éclairer non seulement les enjeux du regroupement des clubs d'athlétisme, les interactions clubs d'athlétisme-FFA-collectivités territoriales, la gouvernance de ces clubs, mais aussi, balise un nouveau cadre comparatif clubs sportifs amateurs-entreprises sous le prisme du regroupement / The grouping of non-professional or amateur sports clubs is a partial or total pooling of their resources. Despite that it has been centrally and generally evoked in scientific researches based on business companies, grouping only has been partially conducted in research studies in the sport field. Our study aims to remove those non-professional/amateur sports clubs from anonymity, expose them to the public eye and facilitate their understandings as well. To accomplish this goal, we used a multidisciplinary approach of sport organizations (including their sociology, management and economy). To understand the phenomenon of grouping non-professional sports clubs. In order to grasp that phenomenon, we need to inquire about the factors at the origin of the groupings, the implementation of such decisions and, finally to inquire on their consequences on the daily life of the sporting club. To answer to inquiries, we analyzed meticulously, the organizational challenges of these groupings, their methods and process, the strategies and logics of action of the main actors, and the consequences of these groupings in the daily life of the club, particularly, on the aspects of culture and identity, economic and sporting, and as regards to the governance within the meaning of Gérard Charreaux (1997). The data collected under an analytical method were of two types: those principals were based on observations and talks and those secondaries were based on newspaper cuttings and documents internal to the clubs and FAF. The principal data consisted of 10 formal talks of an average of 50 minutes each and a hundred abstract talks, conceived in a spirit of complementarity and stepping. The secondary data were collected from 25 numbers of the Le Progrès newspaper from 1999 to 2015, which comprised approximately 50 pages of newspaper cut on the groupings of clubs, the GA and DC reports, meetings of trainers, as well as the status and special regulations of clubs and FAF. All those data were analyzed according to the triptych: qualitative analysis of contents by theorization and anchored strategic analysis actor-theory of the contingency, according to respectively, Pierre Paillé-M. Crozier & E. Friedberg-Henry Mintzberg. Beyond the two principal methods: agreements and fusion. The groupings of athletics’ clubs presented in our research are built collectively and locally. They are more interested, unstable and institutionalized. Five large groups of contingent factors lead the club towards the grouping: objective and manpower of the club, modernization of the club and development of the practice, and the local sporting policy. In this context of grouping of clubs, the managerial latitude of the leader of club remains conditioned on several levels, including, the territorial collectivity and FAF. Our dissertation through the theoretical framework chosen, makes it possible to clarify not only the challenges of grouping athletics’ clubs, the club’s interactions of territorial athletics-FFA-communities, the governance of these clubs, but also, stands out as a new comparative framework non-professional sporting clubs

Depuis une vingtaine d’années, la littérature scientifique traitant de la capture attentionnelle a mis en évidence, à l’aide de paradigmes expérimentaux testés en laboratoire, un certain nombre de processus attentionnels fondamentaux. Bien que les résultats obtenus « en laboratoire » à partir de stimuli visuellement « simples » méritent encore d’être investigués, depuis quelques années se pose la question de la « transposabilité » de ces observations à des objets et des situations issus du monde réel. Les phénomènes observés en laboratoire à partir d’un matériel visuellement simple sont-ils transposables à des situations, complexes, de la vie quotidienne ? Afin de répondre à cette question, nous avons créé et testé différentes conditions proches de celles du monde réel,notamment en expérimentant en situation de double-tâche, en utilisant un matériel visuellement complexe extrait du monde réel (c.-à-d. des photographies de conduite automobile), en faisant varier la fréquence d’apparition de l’élément distracteur ou bien encore en testant une nouvelle caractéristique du distracteur, la dimension sémantique. Nos résultats révèlent les conditions d’apparition du phénomène de capture attentionnelle dans des situations s’approchant de celles du monde réel. Nous avons tout particulièrement détaillé dans cet ouvrage le cas de l’effet de capture attentionnelle contingente, phénomène majeur et robuste de la capture attentionnelle, y compris dans des situations visuellement complexes. / During the last two decades, studies about attentional capture revealed some major basic attentional processes by using several experimental paradigms. While further investigations need to be conducted by using simple visual stimuli, a raising question concerns the possibility to generalize laboratory findings to much more complex real-world situations. Indeed, basic attentional capture studies usually use simple stimuli while real-world displays are generally rich in visual information. To answer this issue, we conducted several experiments under close to real-world conditions, such as testingdual task situations, using complex visual stimuli from real-world situations (e.g. driving-scenes photographs), modulating the distractor frequency or testing attentional capture at a semantic and conceptual dimension. Our results revealed the conditions in which the attentional capture phenomenon occurs in close to real-world situations. We particularly discussed in our work the contingent attentional capture phenomenon which appears to be a strong and robust effect, in both laboratory and close to real-world situations.

La présente thèse explore, à travers quatre papiers, la possibilité d’étendre le régime d’assurance maladie sociale (SHI) vers la couverture santé universelle (CSU) et ce en présence d’obstacles structurels économiques.Les effets moyens de deux traitements, les deux assurances MHI et MAS, sur l’utilisation des soins de santé (consultations externes et hospitalisations) sont estimés. L’actuel régime d’assurance sociale en Tunisie (SHI), malgré l’amélioration de l’utilisation des soins de santé procurée aux groupes couverts, reste incapable d’atteindre une couverture effective de tous les membres de la population vis-à-vis des services de soins dont ils ont besoin. L’atteinte de cet objectif requière une stratégie qui cible les ‘‘arbres’’ et non la ‘‘forêt’’.Le chapitre deux contourne les principaux obstacles à l’extension de la couverture par l’assurance maladie et propose une approche originale permettant de cibler les travailleurs informels et les individus en chômage. Une étude transversale d’évaluation contingente (CV) a été menée en Tunisie se proposant d’estimer les volontés d’adhésion et les consentements à payer (WTP) pour deux régimes obligatoires présentés hypothétiquement à l’adhésion. Les résultats confirment l’hypothèse selon laquelle la proposition d’une affiliation volontaire à un régime d’assurance obligatoire serait acceptée par la majorité des non couverts et que les WTP révélés pour cette affiliation seraient substantiels. Enfin, dans le chapitre trois, on insiste sur l'’importance de prendre en compte les attitudes protestataires en évaluant la progression vers la CSU. / This thesis explores, in a four paper format, the possibility of extending social health insurance (SHI) schemes towards Universal Health Coverage (UHC) in presence of structural economic obstacles.The average treatment effects of two insurance schemes, MHI and MAS, on the utilization of outpatient and inpatient healthcare are estimated. The current Tunisian SHI schemes, despite improving utilization of healthcare services, are nevertheless incapable of achieving effective coverage of the whole population for needed services. Attaining the latter goal requires a strategy that targets the “trees” not the “forest”.Chapter two gets around major challenges to extending health insurance coverage and proposes an original approach by targeting informal workers and unemployed. A cross-sectional Contingent valuation (CV) study was carried out in Tunisia dealing with willingness-to-join and pay for two mandatory health and pension insurance schemes.Results support the hypotheses that the proposition of a voluntary affiliation to mandatory insurance schemes can be accepted by the majority of non-covered and that the WTP stated are substantial.Finally in chapter three we focus on methodological aspects that influence the value of the WTP. Our empirical results show that the voluntary affiliation to the formal health insurance scheme could be a step towards achieving UHC in Tunisia. Overall, we highlight the importance of taking into account protest positions for the evaluation of progress towards UHC.

Made available in DSpace on 2016-08-10T10:50:11Z (GMT). No. of bitstreams: 1 CLEUTON CLENES DA SILVA.pdf: 1417621 bytes, checksum: 3f9b7f8cea0cb7097d1e697b0a56809b (MD5) Previous issue date: 2012-12-20 / This study evaluates the spontaneous Willingness to Pay (WTP) of a proportion of the Goiania II and Sao Judas Tadeu Goiânia residents in order to reduce or eliminate the air pollution, supposedly generated by Goiania II ETE (Sewage Treatment System) and Unilever, which could result in improved quality of life for those who live nearby. The goal of the research was to put a price on environmental pollution, so it was decided to use the Contingent Valuation Method (CVM), as this is most frequently recommended and used when analyzing individual consumer preference in relation to the environmental goods or services at their disposal. As a field research technique, questionnaires were given to a sample of this population, with the aim of evaluating the interviewees conceptions in relation to the environmental issues exacerbated by the Goiania II ETE and Unilever. In order to justify and tabulate the answers found in the questionnaires, the SPSS statistical program was used for regression analyses. Spontaneous WTP was considered the dependent variable while the independent variables included income, education level, occupation, etc.. By means of the field research, it could be affirmed from the majority of interviewees responses that the problem of air pollution, from their conception, is associated in particular with the industries of the region. They further highlight that Government at all levels (local, state and federal) is negligent in terms of the environmental issues which affect the residents. It was concluded that the vast majority of respondents is not willing to pay to reduce or eliminate the existing air pollution that they have to put up with, allegedly for economic reasons. Respondents warn that the Goiania II ETE and Unilever need to improve collective sewage treatment and put environmental policies in place. / Esta pesquisa avalia a Disposição a Pagar (DAP) espontânea de um percentual dos habitantes dos setores Goiânia II e São Judas Tadeu de Goiânia, para diminuir ou desaparecer com o problema da poluição do ar gerado supostamente pela ETE Goiânia II e Unilever, o que poderá resultar na melhoria da qualidade de vida dos habitantes que vivem nas proximidades dessas empresas. O objetivo da pesquisa é, valorar a poluição ambiental, por isso, decidiu-se pelo Método de Valoração Contingente (MVC), devido ser o mais recomendado e utilizado para analisar a preferência individual dos consumidores em relação aos bens ou serviços ambientais disponibilizados a eles. A técnica utilizada na pesquisa de campo foi o uso de questionários a uma amostra dessa população, tendo como intuito, avaliar a concepção dos entrevistados em relação à questão ambiental agravada pela ETE Goiânia II e Unilever. Para justificar e tabular as respostas encontradas nos questionários foi utilizado o programa estatístico SPSS fazendo a análise de regressão. Considerou-se como variável dependente a Disposição a Pagar (DAP), e como variáveis independentes, a renda, o nível de escolaridade, profissão, etc. Pela pesquisa de campo, pôde-se afirmar através da maioria dos pesquisados, que o problema do ar poluído, nas suas concepções, está associado em especial às indústrias da região. Destacam ainda que, o Poder Público em todas as esferas (municipal, estadual e federal), são omissos no que diz respeito aos problemas ambientais que os afetam. Conclui-se ainda que, a grande maioria dos pesquisados, não estão dispostos a pagar uma taxa para diminuir ou desaparecer com a poluição do ar existente e que os atingem, alegando sobretudo, fatores econômicos. Os pesquisados alertam que, a ETE Goiânia II e a Unilever precisam fazer um tratamento melhor do esgoto coletivo e apliquem em políticas ambientais.

L'objectif de ce travail est de développer une méthode capable de déterminer automatiquement l'état de vigilance chez l'humain. Les applications envisageables sont multiples. Une telle méthode permettrait par exemple de détecter automatiquement toute modification de l'état de vigilance chez des personnes qui doivent rester dans un état de vigilance élevée (par exemple, les pilotes ou les personnels médicaux).Dans ce travail, les signaux électroencéphalographiques (EEG) de 58 sujets dans deux états de vigilance distincts (état de vigilance haut et bas) ont été recueillis à l'aide d'un casque à 58 électrodes posant ainsi un problème de classification binaire. Afin d'envisager une utilisation de ces travaux sur une application du monde réel, il est nécessaire de construire une méthode de prédiction qui ne nécessite qu'un faible nombre de capteurs (électrodes) afin de limiter le temps de pose du casque à électrodes ainsi que son coût. Au cours de ces travaux de thèse, plusieurs approches ont été développées. Une première approche propose d'utiliser un pré-traitement des signaux EEG basé sur l'utilisation d'une décomposition en ondelettes discrète des signaux EEG afin d'extraire les contributions de chaque fréquence dans le signal. Une régression linéaire est alors effectuée sur les contributions de certaines de ces fréquences et la pente de cette régression est conservée. Un algorithme génétique est utilisé afin d'optimiser le choix des fréquences sur lesquelles la régression est réalisée. De plus, cet algorithme génétique permet la sélection d'une unique électrode.Une seconde approche est basée sur l'utilisation du Common Spatial Pattern (CSP). Cette méthode permet de définir des combinaisons linéaires des variables initiales afin d'obtenir des signaux synthétiques utiles pour la tâche de classification. Dans ce travail, un algorithme génétique ainsi que des méthodes de recherche séquentielle ont été proposés afin de sélectionner un sous groupes d'électrodes à conserver lors du calcul du CSP.Enfin, un algorithme de CSP parcimonieux basé sur l'utilisation des travaux existant sur l'analyse en composantes principales parcimonieuse a été développé.Les résultats de chacune des approches sont détaillés et comparés. Ces travaux ont aboutit sur l'obtention d'un modèle permettant de prédire de manière rapide et fiable l'état de vigilance d'un nouvel individu. / The aim of this work is to develop a method able to automatically determine the alertness state of humans. Such a task is relevant to diverse domains, where a person is expected or required to be in a particular state. For instance, pilots, security personnel or medical personnel are expected to be in a highly alert state, and this method could help to confirm this or detect possible problems. In this work, electroencephalographic data (EEG) of 58 subjects in two distinct vigilance states (state of high and low alertness) were collected via a cap with $58$ electrodes. Thus, a binary classification problem is considered. In order to use of this work on a real-world applications, it is necessary to build a prediction method that requires only a small number of sensors (electrodes) in order to minimize the time needed by the cap installation and the cap cost. During this thesis, several approaches have been developed. A first approach involves use of a pre-processing method for EEG signals based on the use of a discrete wavelet decomposition in order to extract the energy of each frequency in the signal. Then, a linear regression is performed on the energies of some of these frequencies and the slope of this regression is retained. A genetic algorithm (GA) is used to optimize the selection of frequencies on which the regression is performed. Moreover, the GA is used to select a single electrode .A second approach is based on the use of the Common Spatial Pattern method (CSP). This method allows to define linear combinations of the original variables to obtain useful synthetic signals for the task classification. In this work, a GA and a sequential search method have been proposed to select a subset of electrode which are keep in the CSP calculation.Finally, a sparse CSP algorithm, based on the use of existing work in the sparse principal component analysis, was developed.The results of the different approaches are detailed and compared. This work allows us to obtaining a reliable model to obtain fast prediction of the alertness of a new individual.

The goal of the work is to provide monetary valuation of changes in visual aspects of the landscape as a result of construction of an additional wind turbine in the village Maletín. For a suitable method for achieving the goal is being selected the contingent valuation method. A key element of this method is being considered the carefully compiled questionnaire, on which basis is made the quantification and evaluation of collected data. The representative sample consists of 112 households and the selected payment method is the increase of the monthly bill for electricity. The questionnaire reports that 54.3% of households consider the impact of wind turbines on the landscape Maletín to be positive. With the construction of additional wind turbine agree less than 74.3% of households and the most common reason is to obtain grants for the village and to produce cleaner energy from wind turbines. With the construction of new wind turbine while increasing monthly bill agrees 28.6% of all households living in the village Maletín. Estimation of changes in a welfare, thus improving the quality of the environment, is based on estimated central values, that has been calculated from selected characteristics and nonparametric estimation. The average household's willingness to pay for construction of wind turbine is estimated to be between 77 CZK - 200 CZK per month.

nÃo hà / O propÃsito desta pesquisa consiste em desenvolver um sistema de anÃlise para compreender as interaÃÃes em AVA que favorecem a aprendizagem (interaÃÃes contingentes). Os AVA constituem uma classe de softwares para a criaÃÃo, oferta e gerenciamento de cursos baseados na Internet. Integram Tecnologias de InformaÃÃo e ComunicaÃÃo com a finalidade de criar um ambiente que possibilite o processo de interaÃÃo e de produÃÃo de conhecimentos pelos participantes do cenÃrio educacional. O presente estudo investigou o conceito de interaÃÃo contingente no contexto de duas disciplinas de licenciatura, ministradas na modalidade a distÃncia, dentro do Programa Universidade Aberta do Brasil (UAB), as quais encontram-se ligadas a Ãreas de conhecimento distintas (exatas e humanas) com pÃblicos tambÃm distintos. Como parte da metodologia, observou-se a troca de mensagens em fÃrum e em chat pelos participantes da investigaÃÃo, analisando-as à luz de parÃmetros caracterÃsticos de interaÃÃes contingentes. A anÃlise das mensagens foi confrontada com dados obtidos em entrevistas semi-estruturadas, realizadas com alguns alunos e seus respectivos professores-tutores. O desenvolvimento do Sistema de AnÃlise das InteraÃÃes Contingentes integrou diferentes domÃnios teÃricos (a EducaÃÃo, a Psicologia e a Linguistica) que apontam a interaÃÃo como um fenÃmeno essencial em situaÃÃes educacionais. As categorias foram construÃdas com base na literatura que discute o conceito de interaÃÃo, e aplicadas tanto Ãs comunicaÃÃes sÃncronas quanto assÃncronas, estabelecidas entre os interlocutores das disciplinas de exatas e humanas. O sistema de anÃlise resultante encontra-se estruturado em quatro categorias gerais (ConversaÃÃo, TextualizaÃÃo, DiÃlogo e Aprendizagem) e algumas sub-categorias, ligadas aos domÃnios teÃricos que fundamentaram o seu desenvolvimento. Os resultados apontam a coerÃncia interna do sistema e sua validade, ao constatar a presenÃa das caracterÃsticas de interaÃÃes contingentes em todos os contextos analisados, podendo tambÃm ser aplicado em outros universos de investigaÃÃo. O Sistema de AnÃlise das InteraÃÃes Contingentes traz contribuiÃÃes teÃricas e empÃricas ao conceito de interaÃÃo contingente, alÃm de oferecer parÃmetros para a realizaÃÃo de aÃÃes em EducaÃÃo a DistÃncia fundamentadas em uma perspectiva sociointeracionista. A pesquisa permite concluir que a emergÃncia de interaÃÃes com vistas ao aprendizado depende bem mais das pessoas envolvidas e do tipo de relaÃÃo que estabelecem durante o ato educativo que de uma Ãrea especÃfica ou de uma ferramenta de comunicaÃÃo em particular. / The purpose of this research is to develop an analytical system to understand the interactions in a LMS that promote learning (contingent interactions). The LMS are a class of software for the design, suport and management of Internet-based courses. Integrate Information and Communication Technologies in order to create an environment that enables the process of interaction and production of knowledge by participants of the educational scene. This study investigated the concept of contingent interaction in the context of two undergraduate courses, taught at the blended mode within the Open University of Brazil (UAB), which are linked to different areas of knowledge (hard and humanity sciences) and were ministered for different audiences. As part of the methodology, the exchange of messages between the participants of the research through discussion foruns and chats was observed and analyzed according to the typical parameters of contingent interactions. The analysis of the messages was compared with data obtained from semi-structured interviews conducted with some students and their tutors. The development of the Analytical System of Contingent Interaction integrated different theoretical fields (Education, Psychology and Linguistics) that point out the interaction as an essential phenomenon in educational situations. The categories were builded based on the literature that discusses the concept of interaction, and applied to both synchronous and asynchronous communication established between the interlocutors of the hard and humanity courses. The resulting analytical system is structured into four general categories (Conversation, Textualization, Dialogue and Learning) and some sub-categories, linked to the theoretical areas that supported its development. The results show up the internal coherence of the system and its validity, confirming the existence of contingent interaction characteristics in all contexts examined, which also enables the system application to other research universes. The Analytical System of Contingent Interactions presents theoretical and empirical contributions to the concept of contingent interaction, and provide parameters for performing actions in Distance Education based on a social interactionist perspective. The research indicates that the emergence of interactions with learning objectives depends far more on the relations established among people involved in the educational act than on a specific area or communication tool.

假設市場評價法（Contingent valuation）多用於評估有關某一非市場性財產（Non-market goods）或公共財（Public goods）在民眾心目中的願付價值（Willingness to pay, WTP）。探討受訪者願付價值之研究調查案的問卷設計方式，大致可分成五種，其中開放式出價法和逐步競價法已被證實會對估計造成偏誤，而支付卡法、二分選擇法和雙界二分選擇法則是現今較常為研究者所使用的價格詢問方法，本論文的研究是針對二分選擇法的最佳設計（Optimal design），作一深入的探討。 假設欲探究之母體的願付價值為一服從平均數為 、標準差為 的常態分配，若採用二分選擇法作為價格詢問的方式，則何種詢問方法才能讓參數估計最佳化，由模擬實驗的結果，我們知道若將受訪者隨機等分成兩群，分別詢問兩個不同的價格，且這兩個價格的平均等於預先猜測的母體平均數，那麼不但會有相當不錯的估計結果，在實際的執行上亦較方便。此外，我們提出較容易計算的參數估計量來代替傳統的最大概似估計量（MLE），並以數理證明保證了新的參數估計量有良好的估計性質。 願付價值的研究若對母體資訊不充分時，常會先採行前測（Pretest）。本論文除了探討二分選擇法的最佳設計之外，亦針對支付卡法和二分選擇法運用在前測時，作一深入的討論，結果發現當事先猜測的母體分配參數和真實分配相差很多下，支付卡法和二分選擇法會產生無法估計的情況，因此我們提出新的前測方法，試圖彌補這兩種傳統前測法的不足，我們稱之為序列詢問法（Sequence method）。序列詢問法為一種追蹤母體平均數的方式，依照現在這位受訪者的回答，決定下一位受訪者的詢問價格，在我們的研究中發現，如此的序列詢問方法比傳統的前測法利用更少的資訊，但仍然維持不錯的母體平均數估計結果。