L’entrepreneuriat social est une nouvelle forme entrepreneuriale tournée vers l’accomplissement d’une mission sociétale. L’étude du modèle économique, concept central dans toute aventure entrepreneuriale, fait pourtant défaut dans les recherches académiques. L’objectif de ce travail est de démontrer la pertinence de l’analyse du modèle économique en entrepreneuriat social au moyen d’une analyse de type «business model». Après une étude qualitative exploratoire, quatre cas ont été étudiés sur la base d’entretiens semi-directifs ayant permis de produire une version narrative des business models et des modèles économiques afférents. La comparaison systématique des résultats relève qu’il n’existe pas de méthode infaillible pour construire un modèle économique viable dans le contexte de l’entrepreneuriat social. En s’inscrivant dans une approche dynamique, nous proposons une nouvelle lecture qui décortique le nœud des liens de valeurs en expliquant les résultats de leurs interactions sur la viabilité d’un projet à utilité sociale. Outre le constat sur l’actualité du débat établi, la thèse propose des pistes pour l’écriture d’un modèle économique viable dans les organisations à finalité sociale et permet d’approfondir l’articulation entre différentes stratégies et pratiques dans la mise en place d’une architecture financière porteuse de vertus sociales et de performances plurielles. / Social entrepreneurship is a new form of entrepreneurship focused on achieving a societal mission. The study of the economic model, a central concept in any entrepreneurial venture, is nevertheless lacking in academic research. The objective of this work is to demonstrate therelevance of analyzing the economic model in social entrepreneurship by a "business model" approach. After an exploratory qualitative study,four cases were studied based onsemi-directive interviews that produced a narrative version of their business and related economic models. The systematic comparison of the results shows that there is no foolproof way to build a viable economic model in the social entrepreneurshipcontext. By adopting a dynamic approach, we propose a new interpretation that analyses the core value relationships by explaining the results of their interactions on the project’ssocially useful viability. In addition to the observation on the topicality of the established debate, the thesis proposes avenues for writing a viable economic model in social purpose organizations and makes it possible to deepen the interaction between different strategies and practices in the implementation of a financial architecture bearing social virtues and plural performances.

Although many information system (IS) implementations are considered to have the resources necessary to be successful, they often fail. This is especially challenging for small IS providers who lack a proven process for gaining willingness to use and onboard a new customer. Hence, there is a need to develop a framework to identify potential pitfalls in such implementation matters, from designing the system until successfully onboarded customers. This paper aims to target this issue and proposes a framework for identifying common pitfalls during the implementation process of an IT system. Moreover, this paper applies the framework to an IS provider in the start-up phase by focusing on the system user. With the support of the framework and based on the company's context, this paper presents identified pitfalls and suggestions for actions that the IS provider can take to avoid them. IS models are selected and applied considering the company's needs and previous literature. The IS models considered are Value Network Analysis (VNA), Extended Technology Acceptance Model (TAM2), and Theory of Planned Behavior (TPB). As a result, seven pitfalls are identified considering organizational culture and leading change, user resistance, complexity, mandatory reliance, value demonstration, experience and control, and weak links.