Durch immer knapper werdende Ressourcen, steigendes ökologisches Bewusstsein der Konsumenten und nicht zuletzt gesetzlichen Vorgaben sind produzierende Unternehmen über den gesamten Lebenszyklus ihrer Produkte für diese verantwortlich. Dies gilt im Besonderen für Hersteller elektronischer Produkte. Stetige Innovationen und kurze Nutzungszyklen führen dazu, dass noch funktionierende Geräte ungenutzt in den Haushalten lagern oder im Restmüll entsorgt werden. Mit der WEEE-Richtlinie verpflichtete die EU 2003 die Hersteller elektronischer Produkte dazu, nachhaltiger zu produzieren, Ressourcen effizienter zu nutzen, die Schadstoffbelastung und allgemein das durch die elektrischen Geräte induzierte Müllaufkommen zu reduzieren. Mit der Aufgabe diese Ziele zu erreichen, stellen sich die Hersteller somit einer großen Herausforderung. Auf der einen Seite steigt der Druck des Wettbewerbs, die Konsumenten werden zunehmend kritischer und die Rohstoffkosten steigen. Auf der anderen Seite müssen sie eine adäquate Verwertung ihrer Altprodukte finden und deren Rückführung sicherstellen. Dabei sind sie maßgeblich abhängig von der Entscheidung der Konsumenten. Diese können das Produkt kostenfrei entsorgen, jedoch fehlt es ihnen häufig an entsprechenden Anreizen. Diese Dissertation klärt daher u.a. folgende Forschungsfragen: Welche Möglichkeiten gibt es, die Vorgaben des Gesetzgebers (WEEE) profitabel umzusetzen und wie kann der Konsument in die Planung einer Closed Loop Supply Chain (CLSC) einbezogen werden. Zudem diskutiert sie die Optionen die Handlungen der Konsumenten aktiv zu beeinflussen. Mit Hilfe der spieltheoretischen Modellierung wird ein komplexes dynamisches Modell entwickelt, welches sowohl für den Hersteller als auch für die Endkunden elektronischer Produkte die bestmögliche Lösung vorschlägt. Mit dem entwickelten Modell ist es den Herstellern möglich, ein optimales Produktionsprogramm für mehrere Perioden unter Beachtung einer optimalen Rücknahmestrategie aufzustellen.

Durch immer knapper werdende Ressourcen, steigendes ökologisches Bewusstsein der Konsumenten und nicht zuletzt gesetzlichen Vorgaben sind produzierende Unternehmen über den gesamten Lebenszyklus ihrer Produkte für diese verantwortlich. Dies gilt im Besonderen für Hersteller elektronischer Produkte. Stetige Innovationen und kurze Nutzungszyklen führen dazu, dass noch funktionierende Geräte ungenutzt in den Haushalten lagern oder im Restmüll entsorgt werden. Mit der WEEE-Richtlinie verpflichtete die EU 2003 die Hersteller elektronischer Produkte dazu, nachhaltiger zu produzieren, Ressourcen effizienter zu nutzen, die Schadstoffbelastung und allgemein das durch die elektrischen Geräte induzierte Müllaufkommen zu reduzieren. Mit der Aufgabe diese Ziele zu erreichen, stellen sich die Hersteller somit einer großen Herausforderung. Auf der einen Seite steigt der Druck des Wettbewerbs, die Konsumenten werden zunehmend kritischer und die Rohstoffkosten steigen. Auf der anderen Seite müssen sie eine adäquate Verwertung ihrer Altprodukte finden und deren Rückführung sicherstellen. Dabei sind sie maßgeblich abhängig von der Entscheidung der Konsumenten. Diese können das Produkt kostenfrei entsorgen, jedoch fehlt es ihnen häufig an entsprechenden Anreizen. Diese Dissertation klärt daher u.a. folgende Forschungsfragen: Welche Möglichkeiten gibt es, die Vorgaben des Gesetzgebers (WEEE) profitabel umzusetzen und wie kann der Konsument in die Planung einer Closed Loop Supply Chain (CLSC) einbezogen werden. Zudem diskutiert sie die Optionen die Handlungen der Konsumenten aktiv zu beeinflussen. Mit Hilfe der spieltheoretischen Modellierung wird ein komplexes dynamisches Modell entwickelt, welches sowohl für den Hersteller als auch für die Endkunden elektronischer Produkte die bestmögliche Lösung vorschlägt. Mit dem entwickelten Modell ist es den Herstellern möglich, ein optimales Produktionsprogramm für mehrere Perioden unter Beachtung einer optimalen Rücknahmestrategie aufzustellen.

Title: How an external collection actor enables Lindex’s closed loop supply chain. Context: Customers demand of sustainable products has motivated companies to develop more sustainable business models. The implementation of closed loop supply chain is an effort to keep the value of resources for as long as possible, by reusing and recycling consumer waste. This study identifies what a reverse logistics flow of textile material looks like in a closed loop supply chain, and how companies can gain economies of scale in their reverse logistics. Purpose: The purpose of the study is to investigate how a collection actor handles collected textiles and thereby contributes to the enabling of Lindex’s closed loop supply chain. The identification of the process provides an example of how other organizations can approach the circular economy. The study will also explore various alternatives to achieve economies of scale in the reverse logistics. Questions at issue: 1. “How does an external collection actor, Myrorna, manage Lindex´s reverse logistics of textiles in a closed loop supply chain?” 2. “With what strategies can the external collection actor, Myrorna, achieve economies of scale?” Method: The study practices a qualitative hermeneutic orientation, with an inductive reasoning. It is a one case study where the empirical information was collected by qualitative semi-structured interviews. The sampling technique used to provide the data was purposive sampling. Process mapping through process flow chart was used to analyze the empirical information. The study reaches a certain amount of validity through the use of triangulation of facts. Other ways used to ensure the quality of the study was for example that the respondent reviewed the results to authenticate it. An aspect of criticism is that the study is a one case study and therefor has a lower grade of transferability. The authors have also taken research ethics into consideration. Results: The external collection actor, Myrorna, enables Lindex closed loop supply chain through the physical handling of the collected textiles. According to the head of collection at Myrorna (2020-05-12) the reverse logistics is currently well managed. The study finds supporting evidence for the case, however alternative means of achieving economies of scale are proposed. One proposition is to outsource the domestic transportation through a third party logistics company. Another is to include pickup of goods at Lindex stores to Myrornas iv current pickup routes or to use a third party logistics company. Myrorna already handles a lot of textiles in their sorting operation, and the authors therefore suggests that they will keep insourcing this part of the reverse logistics. As a final suggestion Myrorna should continue outsourcing the export of leftover textiles in order to achieve economies of scale. Keywords: Supply chain management, Sustainable fashion industry, Closed loop supply chain, Process flowchart, Reverse logistics, Textile collection, Economies of scale.

Cette thèse est consacrée à l'étude des législations environnementales et leurs effets sur la chaîne d'approvisionnement. Plus précisément, nous nous intéressons à la législation basée sur le recyclage du produit mais aussi sur les normes de conformité (ROHS). Nous étudions le potentiel de réutilisation ainsi que les aspects environnementaux et économiques de différents systèmes de législation. La solution se présente sous forme d'une combinaison de politiques de récupération qui mène à de meilleurs résultats sur le plan écologique ainsi que sur le plan économique.Dans la deuxième partie de la thèse, Nous étudions la performance comparative des régimes à base sur la législation de récupération avec des problématiques d'innovation et de conception de produits. La politique de réutilisation des produits peut aggraver l’environnement si le cadre de la régulation n'est pas bien défini. Dans la dernière partie, une étude est menée sur le choix des produits dans une chaine d’approvisionnement avec des législations basées sur la récupération et sur la conformité des produits. Nous intégrons les effets de l'incertitude associée à la demande du marché et les paramètres de coût de récupération. Une méthode d'optimisation robuste pour la sélection et distribution des produits est présentée. / Climate change and global temperature rise has made environmental legislations a focal point of discussion. This dissertation is devoted to the study of environmental legislations and their effect on supply chain practices. More precisely, our center of interest is the product recovery based legislation along with compliance based regulations. We explore the reuse potential and the environmental and economical aspects of different product recovery based legislation schemes by modeling a stackelberg game between a social welfare maximizing policy maker and a profit maximizing monopolistic firm and find that a combination of existing recovery policies i.e., a recovery target in combination with incentive structure such as taxation/subsidy may lead to better outcomesnot only from environmental perspective but also from economical aspects. In Chapter 2, we extend the discussion comparative performance of the recovery legislation based schemes in presence of innovation and product design issues and show how unintended environmental outcomes may appear if the policy framework is not adequately designed. In Chapter 3, wecapture the effect of recovery legislation and compliance based legislation on product selection when a firm serves a number of markets. We incorporate the effects of uncertainty associated with market demands and recovery cost parameters and present a robust optimization based method for product selection and allocation decisions.

As pesquisas identificam os modelos e práticas ligados a cadeias de suprimentos de ciclo fechado, como uma das estratégias para o desenvolvimento sustentável através da recuperação do produto pós-consumo, maximizando a criação de valor ao longo de todo seu ciclo de vida, transformando o que é resíduo em produto para novo uso. O objetivo desta pesquisa é identificar como a gestão da cadeia de suprimentos de ciclo fechado pode criar e capturar o valor deste produto pós-consumo. O método adotado foi de múltiplos estudos de caso explorando duas cadeias de suprimentos de ciclo fechado a de baterias automotivas chumbo ácido e de produtos eletrônicos tais como telefones celulares, notebooks, tablets, impressoras, desktops e monitores no Brasil. Primeiro conduzimos uma análise do relacionamento entre as empresas de cada cadeia e então expandimos nossa análise comparando as duas cadeias. Os resultados sugerem que para criar e capturar valor na cadeia de suprimentos direta ou tradicional é necessário a gestão das dimensões prioridades competitivas, estrutura da cadeia de suprimentos, relacionamento comprador-fornecedor, compras estratégicas e inovação. Entretanto, para a cadeia de suprimentos de ciclo fechado criar e capturar valor será necessário além da gestão destas dimensões adicionarmos maior interdependência entre as empresas, vantagem colaborativa, gestão tétrade multinível e uma estrutura da cadeia de suprimentos com novas ramificações em outros setores e indústrias que aumenta a quantidade de produtos pós-consumo retornados, resultando em um importante ganho de economia de escala, com foco no processo de reciclagem. / The researches identify closed loop supply chain models and practices as one of the sustainable development strategies through post consumption product recovery, maximizing value creation over the entire life cycle of a product transforming waste in a product for new use. The aim of this research is to understand and identify how the closed loop supply chain management can create and capture the value of this post consumption product. By adopting a multiple case study method, studying two Brazilian\'s closed loop supply chain the lead acid battery industry supply chain and electronic products industry supply chain for mobile phones, notebooks, tablets, printers, desktops and monitors. We first conduct a relationship analysis between the firms of each supply chain then we expand our analysis comparing the two chains. The results show that for value creation and capture in supply chain is required management in dimensions competitive priorities, supply chain structure, buyer supplier relationship, strategic purchasing and innovation. However for closed loop supply chain besides management in these dimensions we must add firms\' bigger interdependency, collaborative advantage, multi-level tetrad management and a supply chain structure with new connections in others industries, that increases the post consumption product\'s return resulting in an important gain from economies of scale focusing in recycling process.

Motivés par l'évolution des réglementations en matière d'écologie mais aussi par des contraintes purement économiques, plusieurs secteurs industriels se sont retrouvés dans l'obligation de développer de nouvelles méthodes et modèles pour la gestion des produits en fin de vie. Dans ce contexte, la remanufacturation vise à gérer la récupération de la valeur d’un produit avant sa fin de vie. Elle permet de prolonger le cycle de vie du produit et d’économiser une partie des besoins industriels en matière première. Ces produits remanufacturés seront remis dans le marché et destinés à une autre catégorie de clients, différente de celle des produits neufs. Dans d'autres cas, les produits remanufacturés sont réutilisés sous la forme de pièces de rechange dans les actions de maintenance, mais cette réutilisation peut varier selon la stratégie de maintenance adoptée. Dans ce contexte, cette thèse s'intéresse à l’intégration d'un flux d’approvisionnement hybride en pièces de rechange dans un modèle de maintenance basé sur la dégradation stochastique d’un système de production. Deux types de flux d’approvisionnement en pièces de rechange sont étudiés : un flux direct et un flux inverse. Le flux direct est représenté par l'utilisation de pièces de rechange neuves et le flux inverse est représenté par la réutilisation des pièces récupérées lors des remplacements ultérieurs, avec la possibilité de réaliser une action de remanufacturation pour améliorer l'état de dégradation de ces pièces de rechange. Plusieurs problématiques ont été traitées pour permettre de comprendre l'impact et l'influence d'une politique de remanufacturation sur les performances d'un système de production. En effet, dans un premier temps, nous nous sommes intéressés à des systèmes de production composés d'une seule machine. Dans ce cadre, nous avons proposé des études séquentielles puis intégrées pour optimiser la politique de maintenance et celle de l'approvisionnement hybrides en pièces de rechange destinées aux actions de remplacements. Nous avons étudié également la gestion de production soumise à une contrainte de qualité basée sur l'évolution de la dégradation de la machine. Ensuite, et dans un second temps, nous avons présenté des généralisations des modèles étudiés dans le cadre de systèmes de production composés de plusieurs machines. Enfin, nous avons développé un outil d'aide à la décision pour conception de systèmes de production dans le cadre d'une politique de remanufacturation. Cette problématique - du niveau stratégique - vise à sélectionner le meilleur ensemble de machines pour construire un nouveau système de production capable de satisfaire les contraintes de production définies par décideur / Motivated by the change of regulations in the matter of sustainability, but also by pure economic constraints, several industries have found themselves obligated to develop new methods and models for the management of products that are at the end of their life cycle. In this context, the remanufacturing aims at managing the recovery of the product’s value before its end of life. This type of action will extend the product life cycle and save the use of the raw material. These remanufactured products will be re-injected in a market that serves another class of customers, different from the one using new products. In other cases, the remanufactured products are reused as spare parts for the maintenance, but this reuse may vary according to the maintenance strategy adopted. This thesis focuses on the integration of a hybrid flow supply of spare parts in a service model based on stochastic degradation of a production system. Two types of spare parts supply flows are studied: a direct flow and reverse flow. The direct flow is represented by the use of new spare parts and the reverse flow is represented by the reuse of the recovered parts during the replacements, with the ability to perform remanufacturing action to improve the degradation level of these spare parts. Several issues were treated to better understand the impact of remanufacturing policies over the performance of a production system. At the beginning we started our study with production systems composed of a single machine. In this context, we proposed sequential studies then integrated one to optimize the maintenance policy as well as the Hybrid provisioning in regard to spare parts destined to replacement actions. Similarly, we’ve studied the production management subjected to quality constraint based on the machine’s degradation process. Furthermore, we’ve presented generalizations of studied models within the context of a production system composed of several machines. Finally, we’ve developed an aid-to-decision-design tool for production systems within the remanufacturing process. This problematic aims at –from a strategic point- selecting the best group of machines to build a new system of production that is able to satisfy the constraints of a production defined by the decision maker

從1990年代個人電腦普及以來，電子垃圾產生了嚴重的環境問題，其中尤以廢電腦的影響為鉅。2001年美國發動The Computer Take Back Campaign (CTBC)來推動製造商處理其生產的有毒性電腦廢棄物。其後歐洲提出「生產者責任延伸(extended producer responsibility, EPR)」法規，並在2003年歐盟宣布施行「廢電子電器回收指(Directive on Waste Electric and Electronics Equipment, WEEE)」。再加上我國國內亦繼此世界趨勢陸續頒布廢容器、廢汽機車、廢家電產品及廢電腦強制回收再生的法規，也因此舊廢產品的回收逆物流處理能力對我國電子電器及資訊產品廠商就顯得益發重要。 但現行電子產業中絕大部分的廠商都是採「出售商品」的事業模式，製造商難以掌握產品售後流向、進而回收其舊廢產品。且關於此類電子資訊產業如何佈建一個具獲利基礎的封閉式供應鏈、以及實施的狀況與程序之相關研究甚少。於此，本論文欲探討：對電子產業來說，在哪些條件之下才能達成封閉式供應鏈？其中的關鍵因素又為何？盼能透過個案研究的方式，從實務上的運作狀況探討其中的原因。 本研究選擇重視全球環保及永續發展的華碩電腦，以及在逆物流回收實施領域施行多年且成效顯著的Dell電腦做為個案研究的對象。本研究架構乃依據文獻分析結果，從驅動個案公司進行產品回收的力量開始分析，進一步檢視個案公司的回收再生策略，並從訪談及其他文獻資料內容中分析有哪些重要因素會影響個案公司達成封閉式供應鏈，這些要因會根據第二章歸納出的四大面向為基礎進行比較。最後，根據分析結果評估個案公司在封閉式供應鏈的完成度與績效表現。 / Since 1990s, the electronic wastes (e-wastes), especially PCs and laptops, have caused serious environmental problems. In 2001, the Computer Take Back Campaign (CTBC) initiated and asked the PC manufacturers to be in charge of toxic e-wastes that they produced in the U.S; in 2003, the European Union declared the Directive on Waste Electric and Electronics Equipment (WEEE); besides, Taiwanese government also put the recycling laws into practice, requiring that the wasted containers, cars and motorcycles, electronic products and PCs should be recycled. Therefore, the capability of managing e-wastes has become more and more crucial for Taiwanese PC manufacturers. For those manufacturers who sell out electronic products, it’s difficult to track and recycle their wasted products. Furthermore, there are few researches discussing about how to build up a profitable closed-loop supply chain. Therefore, this study will focus on exploring the key success factors for building up a profitable closed-loop supply chain in the electronic industry. In the case study, ASUS Tek Inc. and Dell Inc., both are dedicating great efforts on recycling issues, were chosen to be the case companies. The framework of this study will start from analyzing the drivers of recycling, the recycling strategies, and then generalizing the key successful factors, which are discussed in Chapter 2, for building up a profitable closed-loop supply chains for the case companies. Finally, the study will evaluate the completeness and performance of the case companies.

Le contexte d’application de cette recherche a été le projet CRIBA. CRIBA vise à industrialiser une solution intégrée de rénovation et d’isolation de grands bâtiments. De ce fait, une part importante de la valeur ajoutée est transférée des chantiers de rénovation vers des usines de fabrications devant être synchronisées avec les chantiers. La planification est l'une des étapes importantes de la gestion de projets. S’adaptant à une organisation, elle vise une réalisation optimale en considérant les facteurs de temps, coût, qualité ainsi que l’affectation efficace des ressources. Cette affectation est d’autant plus complexe lorsqu’un ensemble de projets se partagent les ressources, renouvelables ou non renouvelables. L'objectif global de notre étude est de développer un outil d’aide à la décision pour un décideur visant à planifier plusieurs projets en intégrant l'allocation des ressources renouvelables, et la planification des flux de ressources non-renouvelables vers ces projets. Dans ce cadre, les ressources non renouvelables telles que les machines et la main-d'œuvre ont une disponibilité initiale limitée sur les chantiers. Cependant, nous supposons que des quantités limitées supplémentaires peuvent être achetées. En outre, nous prenons en compte la volonté des coordinateurs des projets pour l’approvisionnement des chantiers en juste à temps (just in time), en particulier pour les ressources peu demandées, encombrantes et à forte valeur. Ceci oblige à étendre le cadre du modèle de la planification des projets en incluant la planification de la chaîne logistique qui approvisionne les ressources non renouvelables des chantiers. Enfin, pour répondre au besoin d’outils décisionnels responsables sur le plan environnemental, le modèle prévoit le transport et le recyclage des déchets des chantiers dans les centres appropriés. Un modèle linéaire mixte du problème est ainsi posé. Puisqu’il rentre dans la classe des modèles d'optimisation NP-durs, une double résolution est proposée. D’abord à l’aide d’un solveur puis une méta-heuristique basée sur un algorithme génétique. De plus, pour faciliter l'utilisation du modèle par des utilisateurs peu familiers avec la recherche opérationnelle, un système d'aide à la décision basé sur une application web a été développé. L’ensemble de ces contributions ont été évaluées sur des jeux de test issus du projet CRIBA. / The application context of the current study is on a CRIBA project. The CRIBA aims to industrialize an integrated solution for the insulation and thermal renovation of building complexes in France. As a result, a significant part of the added value is transferred from the renovation sites to the manufacturing centers, making both synchronized. Planning is one of the important steps in project management. Depending on the different viewpoints of organizations, successful planning for projects can be achieved by performing to optimality within the time, cost, quality factors as well as the efficient assignment of resources. Planning for the allocation of resources becomes more complex when a set of projects is sharing renewable and non-renewable resources. The global objective of the study is to develop a decision-making tool for decision-makers to plan multiple projects by integrating the allocation of the renewable resources and planning the flow of non-renewable resources to the project worksites. In this context, non-renewable resources such as equipment and labor have a limited initial availability at the construction sites. Nevertheless, we assume that additional limited amounts can be added to the projects. In addition, we take into account the interest of the project coordinators in supplying the non-renewable resources in a just-in-time manner to the projects, especially for low-demand resources with a high price. This requires extending the framework of the project planning by including the planning of the supply chain which is responsible. Finally, in order to meet the requirements for environmentally responsible decision-making, the model envisages the transportation and recycling of waste from project sites to appropriate centers. A mixed integer linear model of the problem is proposed. Since it falls within the class of NP-hard optimization models, a double resolution is targeted: first, using a solver and then a metaheuristic based on the genetic algorithm. In addition, in order to facilitate the use of the model by users unfamiliar with operational research, a web-based decision-making support system has been developed. All the contributions are evaluated in a set of case studies from the CRIBA project.

As pesquisas identificam os modelos e práticas ligados a cadeias de suprimentos de ciclo fechado, como uma das estratégias para o desenvolvimento sustentável através da recuperação do produto pós-consumo, maximizando a criação de valor ao longo de todo seu ciclo de vida, transformando o que é resíduo em produto para novo uso. O objetivo desta pesquisa é identificar como a gestão da cadeia de suprimentos de ciclo fechado pode criar e capturar o valor deste produto pós-consumo. O método adotado foi de múltiplos estudos de caso explorando duas cadeias de suprimentos de ciclo fechado a de baterias automotivas chumbo ácido e de produtos eletrônicos tais como telefones celulares, notebooks, tablets, impressoras, desktops e monitores no Brasil. Primeiro conduzimos uma análise do relacionamento entre as empresas de cada cadeia e então expandimos nossa análise comparando as duas cadeias. Os resultados sugerem que para criar e capturar valor na cadeia de suprimentos direta ou tradicional é necessário a gestão das dimensões prioridades competitivas, estrutura da cadeia de suprimentos, relacionamento comprador-fornecedor, compras estratégicas e inovação. Entretanto, para a cadeia de suprimentos de ciclo fechado criar e capturar valor será necessário além da gestão destas dimensões adicionarmos maior interdependência entre as empresas, vantagem colaborativa, gestão tétrade multinível e uma estrutura da cadeia de suprimentos com novas ramificações em outros setores e indústrias que aumenta a quantidade de produtos pós-consumo retornados, resultando em um importante ganho de economia de escala, com foco no processo de reciclagem. / The researches identify closed loop supply chain models and practices as one of the sustainable development strategies through post consumption product recovery, maximizing value creation over the entire life cycle of a product transforming waste in a product for new use. The aim of this research is to understand and identify how the closed loop supply chain management can create and capture the value of this post consumption product. By adopting a multiple case study method, studying two Brazilian\'s closed loop supply chain the lead acid battery industry supply chain and electronic products industry supply chain for mobile phones, notebooks, tablets, printers, desktops and monitors. We first conduct a relationship analysis between the firms of each supply chain then we expand our analysis comparing the two chains. The results show that for value creation and capture in supply chain is required management in dimensions competitive priorities, supply chain structure, buyer supplier relationship, strategic purchasing and innovation. However for closed loop supply chain besides management in these dimensions we must add firms\' bigger interdependency, collaborative advantage, multi-level tetrad management and a supply chain structure with new connections in others industries, that increases the post consumption product\'s return resulting in an important gain from economies of scale focusing in recycling process.

Abstract  Purpose:  The purpose of the research was to define Product-Service-System (PSS) and Product-as-a- Service (PaaS), identify the challenges and match mitigations with them when closing the supply chain from a B2C retailer’s perspective. The following three research questions were defined:  RQ1: How are Product-Service-System and Product-as-a-Service defined and related to the environmental sustainability context?  RQ2: What are the challenges that B2C-retailers with a Product-as-a-Service model encounter in regard to closing their supply chain loop?  RQ3: How can the closed loop supply chain related challenges that B2C-retailers encounter be mitigated to unfold the environmentally sustainable potential of PaaS business models?  Methodology: A systematic literature review was used for defining PaaS and PSS with an environmentally sustainable focus. The second part of the research is based on a qualitative research method with the use of an interview study setup where 2 industry experts and 4 PaaS companies from the fashion, furniture, mobility and whitegoods industries were interviewed. The empirical data was collected using six semi-structured interviews over zoom.  Findings:  Both PSS and PaaS are focused on providing the product with a service. The biggest difference between PSS and PaaS is that the former is seen as a paradigm shift with regards to linear models whereas the latter is seen as a practical business model to transform a linear system. Based on the intended use, PSS and PaaS are both not inherently more sustainable than linear business models. The standardised definition was further used and integrated for the development of the framework which displays the challenges and mitigations of different levels for an environmentally sustainable PaaS model. The final framework displays 25 challenges. To those challenges, 24 mitigations could be connected. Furthermore, there were 16 challenges that had not been cross validated and a total of 19 challenges that could not be matched with any mitigation. Those unmatched challenges show the need for further research in this area.  Contributions/value:  The contribution that this thesis brings to existing literature is threefold. First, PSS and PaaS are defined and related to environmental sustainability, solving the fragmentation that was caused in prior research. Secondly, the challenges found widen the scope of existing knowledge about PSS and PaaS in a CLSC. Thirdly, mitigation horizons were elaborated on in this research, giving practical handlebars to managers for overcoming challenges in the B2C PaaS field and theoretical insights for matching challenges and mitigations. Additionally, this thesis points out possibilities for future research, with which we hope to motivate other researchers to shed light on under-researched areas.  Keywords:  Product-as-a-Service (PaaS) - Product-Service-System (PSS) - Servitization - B2C Retailer - Circular Economy - Circular Business Model - Environmental Sustainability - Challenges - Mitigations - Closed Loop Supply Chain