Electric and hybrid-electric vehicles lean heavily on intricate control algorithms to provide smooth, reliable, and secure operations under any driving conditions. Three distinct supervisory control strategies have been developed, each aiming to improve reliability and vehicle performance of a dual-motor electric vehicle equipped with an all-wheel-drive, fully electric powertrain. These algorithms are adept at dynamically modulating and constraining the torque provided to the wheels, leveraging two autonomous permanent magnet electric drive units. This study utilizes a vehicle model jointly provided by MathWorks and General Motors in partnership with industry sponsors. The these strategies were implemented in the model and enhanced the performance, vehicle range, energy consumption, regenerated energy using specific EDUs provided by sponsors. Adhering to a systematic engineering iterative method, the emphasis was heavily placed on simulation and modeling during the development and validation of these strategies. Simulations ensured robust testing before field implementation, emphasizing software modeling's vital role.

German text / Die vorliegende Arbeit widmet sich der Bedeutung des Allgemeinen Priestertums im missionarischen Gemeindeaufbau. Leitend ist dabei die Frage, inwieweit die Verwirklichung des Allgemeinen Priestertums ein Wachstumsfaktor für Gemeinden darstellt. Die Untersuchung beginnt mit einer biblisch fundierten Definition des Gemeindewachstums. Darauf aufbauend folgt eine Erläuterung der Typologie des Gemeindewachstums sowie eine Darstellung der primären Wachstumsfaktoren und ihrer Zusammenhänge. Im Anschluss wird auf der Grundlage der biblischen Begründung sowie des Forschungsstandes ein ekklesiologisches Konzept des Allgemeinen Priestertums entworfen. Ausgewählte Schwerpunkte der kirchengeschichtlichen Entwicklung vertiefen die dogmatischen und praktischen Erkenntnisse zur Verwirklichung des Allgemeinen Priestertums. Die biblische Begründung des Allgemeinen Priestertums bildet im weiteren Forschungsverlauf die Grundlage zur Entwicklung einer quantitativen Umfrage. Unter Verwendung des eigens erstellten Fragebogens wird die Verwirklichung des Allgemeinen Priestertums in der Ev. Gemeinde Schönblick sowie in der Ev. Kirchengemeinde Bernhausen vergleichend und hypothesenprüfend untersucht. Auf der Basis der quantitativen Ergebnisse folgt mit Hilfe von unterschiedlichen Leitfadeninterviews eine qualitative Umfrage in der Ev. Gemeinde Schönblick. Die Analyse der qualitativen Studie erfolgt durch die Anwendung der Grounded Theory hypothesengenerierend. Schließlich wird das empirische Gesamtergebnis dem ekklesiologischen Konzept des Allgemeinen Priestertums gegenübergestellt, um individuelle Handlungsanweisungen für den Glaubenden sowie Strukturprinzipien für den Gemeindeaufbau zu begründen. Die Doktorarbeit (Thesis) leistet damit einen empirischen Beitrag zum Verständnis des Allgemeinen Priestertums als Grundfrage eines missionarischen Gemeindeaufbaus. Die Ev. Gemeinde Schönblick dient dabei als Modell einer wachstumsorientierten Gemeindearbeit. / The present work deals with the meaning of the priesthood of all believers in missionary church development. The leading question is: To what extent is the development of the priesthood of all believers a factor of growth in the work of a given congregation? The study begins with a biblical definition of church growth. From this starting point, the types of church growth are discussed and key growth factors and their context are elucidated. On the basis of this biblical foundation and drawing on current research, an ecclesiological concept for the priesthood of all believers will then be formulated. Selected key factors in the historic development of the church will serve to underpin the dogmatic and empirical findings pertaining to the realisation of the priesthood of all believers. The biblical foundation of the priesthood of all believers forms the basis of the development of a quantitative survey which will be done during the course of the study. Using a specially designed questionnaire, the praxis of the priesthood of all believers in the evangelical congregation of Schönblick as well as in the church of Bernhausen is examined, compared, and the hypothesis is tested. On the basis of the quantitative results a qualitative survey of the evangelical congregation of Schönblick is conducted with the help of various guided interviews. The analysis of the qualitative study is done using the Grounded Theory in a way that generates a hypothesis. Finally, the overall empirical result is put in juxtaposition to the ecclesiological concept of the priesthood of all believers in order to establish reasons for individual instructions of the believers as well as structural principles for the congregation. The doctoral thesis provides an empirical contribution to the understanding of the priesthood of all believers as a foundation of church growth. The evangelical congregation of Schönblick serves as a model of a church oriented towards growth. / Practical Theology / D. Th. (Practical Theology)

German text / Die vorliegende Arbeit widmet sich der Bedeutung des Allgemeinen Priestertums im missionarischen Gemeindeaufbau. Leitend ist dabei die Frage, inwieweit die Verwirklichung des Allgemeinen Priestertums ein Wachstumsfaktor für Gemeinden darstellt. Die Untersuchung beginnt mit einer biblisch fundierten Definition des Gemeindewachstums. Darauf aufbauend folgt eine Erläuterung der Typologie des Gemeindewachstums sowie eine Darstellung der primären Wachstumsfaktoren und ihrer Zusammenhänge. Im Anschluss wird auf der Grundlage der biblischen Begründung sowie des Forschungsstandes ein ekklesiologisches Konzept des Allgemeinen Priestertums entworfen. Ausgewählte Schwerpunkte der kirchengeschichtlichen Entwicklung vertiefen die dogmatischen und praktischen Erkenntnisse zur Verwirklichung des Allgemeinen Priestertums. Die biblische Begründung des Allgemeinen Priestertums bildet im weiteren Forschungsverlauf die Grundlage zur Entwicklung einer quantitativen Umfrage. Unter Verwendung des eigens erstellten Fragebogens wird die Verwirklichung des Allgemeinen Priestertums in der Ev. Gemeinde Schönblick sowie in der Ev. Kirchengemeinde Bernhausen vergleichend und hypothesenprüfend untersucht. Auf der Basis der quantitativen Ergebnisse folgt mit Hilfe von unterschiedlichen Leitfadeninterviews eine qualitative Umfrage in der Ev. Gemeinde Schönblick. Die Analyse der qualitativen Studie erfolgt durch die Anwendung der Grounded Theory hypothesengenerierend. Schließlich wird das empirische Gesamtergebnis dem ekklesiologischen Konzept des Allgemeinen Priestertums gegenübergestellt, um individuelle Handlungsanweisungen für den Glaubenden sowie Strukturprinzipien für den Gemeindeaufbau zu begründen. Die Doktorarbeit (Thesis) leistet damit einen empirischen Beitrag zum Verständnis des Allgemeinen Priestertums als Grundfrage eines missionarischen Gemeindeaufbaus. Die Ev. Gemeinde Schönblick dient dabei als Modell einer wachstumsorientierten Gemeindearbeit. / The present work deals with the meaning of the priesthood of all believers in missionary church development. The leading question is: To what extent is the development of the priesthood of all believers a factor of growth in the work of a given congregation? The study begins with a biblical definition of church growth. From this starting point, the types of church growth are discussed and key growth factors and their context are elucidated. On the basis of this biblical foundation and drawing on current research, an ecclesiological concept for the priesthood of all believers will then be formulated. Selected key factors in the historic development of the church will serve to underpin the dogmatic and empirical findings pertaining to the realisation of the priesthood of all believers. The biblical foundation of the priesthood of all believers forms the basis of the development of a quantitative survey which will be done during the course of the study. Using a specially designed questionnaire, the praxis of the priesthood of all believers in the evangelical congregation of Schönblick as well as in the church of Bernhausen is examined, compared, and the hypothesis is tested. On the basis of the quantitative results a qualitative survey of the evangelical congregation of Schönblick is conducted with the help of various guided interviews. The analysis of the qualitative study is done using the Grounded Theory in a way that generates a hypothesis. Finally, the overall empirical result is put in juxtaposition to the ecclesiological concept of the priesthood of all believers in order to establish reasons for individual instructions of the believers as well as structural principles for the congregation. The doctoral thesis provides an empirical contribution to the understanding of the priesthood of all believers as a foundation of church growth. The evangelical congregation of Schönblick serves as a model of a church oriented towards growth. / Philosophy, Practical and Systematic Theology / D. Th. (Practical Theology)

The increase in electric vehicles and photovoltaic power production may introduce problems to the low-voltage distribution grid. With a higher number of electric vehicles, their accumulated charging power might breach the lowest allowed voltage level of the grid. Photovoltaic-modules can on the other hand exceed the highest allowed voltage level, by producing high accumulated power when the solar irradiance is high. Normally, electric distribution companies in Sweden reinforce the existing grid with more resilient infrastructure, such as stronger and larger cables or transformer stations. This is however a costly and time-consuming solution, which could be solved by using alternative means such as already existing resources. This Master's Thesis investigates how smart charging of batteries can support the low-voltage electrical grid with the increase in electric vehicles and photovoltaic power production. To do this, an optimization tool has been developed in Matlab. An existing model of a low-voltage grid is combined with the developed tool, where controllable batteries and photovoltaic-modules can be placed at specific households in the grid. The controllable batteries belong to either electric vehicles or stationary battery systems, and are intended to support the grid by the means of either reducing peak load powers, voltage variations, or a trade-off between them. Furthermore, this thesis investigates the maximum electric vehicle capability for a specific low-voltage electrical grid in Sweden. From the results, it can be concluded that smart charging of batteries can reduce the peak loads as well as voltage variations. The reduction of voltage variations for the entire low-voltage grid is greatest during the summer, when photovoltaic production generally is at its highest. The results also show that a stationary battery system can reduce the voltage variations to a greater extent, compared to an electric vehicle. Also, the introduction of multiple controllable batteries allows further support of the low-voltage grid. Regarding the maximum electric vehicle capability, the results show that the placement of the vehicles and the charging power strongly affect the maximum number of electric vehicles the low-voltage grid can manage. / Ökningen av elbilar och elproduktion från solceller kan ge problem i lågspänningsnätet. Med ett ökat antal elbilar kan den sammanlagrade effekten vid laddning underskrida den minsta tillåtna spänningsnivån i nätet. Solpaneler kan däremot leda till att den högsta tillåtna spänningsnivån överskrids, genom att producera en hög sammanlagrad effekt när solstrålningen är som högst. Vanligtvis förstärker elnätsbolag i Sverige det befintliga nätet med motståndskraftigare infrastruktur, såsom kraftigare och större kablar eller transformatorstationer. Detta är dock en kostsam och tidskrävande lösning, som skulle kunna lösas med alternativa medel, till exempel redan existerande resurser. Detta examensarbete undersöker hur smart laddning av batterier kan ge stöd till lågspänningsnätet, med en ökning av elbilar samt solcellsproduktion. För att undersöka detta har ett optimeringsverktyg utvecklats i Matlab. En befintlig modell av ett lågspänningsnät har kombinerats med det utvecklade optimeringsverktyget, där styrbara batterier samt solcellsproduktion kan placeras vid specifika hushåll i elnätet. De styrbara batterierna är antingen elbilar eller stationära batterisystem, och är ämnade till att stödja lågspänningsnätet genom att antingen reducera effekttoppar, spänningsvariationer eller en kompromiss av båda. Vidare undersöker detta examensarbete det maximala antalet elbilar som ett specifikt lågspänningsnät i Sverige kan hantera. Resultaten visar att smart laddning av batterier kan reducera effekttoppar samt spänningsvariationer. Reduceringen av spänningsvariationerna för hela lågspänningsnätet visar sig vara högst under sommaren, vilket är då solcellsproduktionen generellt är som högst. Resultaten visar även att stationära batterisystem kan reducera spänningsvariationer ytterligare, jämfört med en elbil. Att introducera flera styrbara batterier tillåter ett ännu större stöd till lågspänningsnätet. Angående det maximala antalet av elbilar som ett lågspänningsnät kan hantera visade resultaten att placeringen av elbilarna samt laddningseffekten har en stor påverkan.

The electric vehicle industry is under rapid development and the fleet of chargeable cars in society is increasing fast. As a result, a high demand for public chargers has emerged. Simultaneous to the expansion of the electric vehicle fleet and charging infrastructure the power grid is occasionally highly strained. Additionally, factors like cities expanding and the digitization of society also have a large effect on the power grid. This master's thesis investigates the characteristics of electric vehicle users and presents a prototype of an information display for electric vehicle charging stations. The design is is based on the user studies and founded in theory about sustainable user behaviour with the goal of encouraging behaviours that minimize the strain on the local power grid of Uppsala. It concerns the research topic of how to design for sustainable behaviour and address research questions of how to design electric vehicle charging station information to communicate multiple charging alternatives to a broad variety of users. The work reveals that electric vehicle users suffer from the charging infrastructure being underdeveloped, feel frustration towards payment solutions available and lack information regarding electric vehicle use. Also, electric vehicle user's common passion for tech and environmental consciousness are revealed in the study. These facts are used as the foundation for the mobile application design prototype suggested.

Due to urbanization and the population of cities producing up to 75% of emission, Smart City concepts, looking at sustainability and more efficiency within the city, with the help of IoT and ICT based technology, are seen as an opportunity to act future-oriented, today. Construction and transportation are seen as the main contributors on the way of change from energy consumption to energy production. Enhancing infrastructure to improve the quality of all sorts of public transportation is thus of utter importance to governance, interested in Smart City concepts. Looking at the literature, waterborne transportation has not received much scientific attention in the context of being implemented into Smart City initiatives. This systematic literature research draws logical conclusions from the researched literature. The research concludes with a research agenda for future research to deepen the knowledge in the explanatory field of waterborne transportation making use of Smart City technologies. The main findings of this thesis are: First, waterborne transportation poses a threat to the environment and impacts sustainability of water bodies, as well as the environment surrounding them. Second, Smart City technologies can successfully be implemented in waterborne transportation when carefully planned. Barriers for the implementation of Smart City concepts can be lack of knowledge, investment, data security and readiness of infrastructure. These can be overcome through the help of collaboration and knowledge sharing among the involved stakeholders. Third, the image of the industry can be shifted, as well as its direct impact and the indirect use of waterborne transportation can be made more sustainable and ecosystem friendly. This transition attracts further customers, who otherwise were not willing to use waterborne transportation. In order to make waterborne transportation more sustainable and part of the Smart City movement, knowledge needs to be deepened and awareness about the topic needs to be spread. Its use of Smart City technologies needs to be further investigated, looking at specific types and tailored solutions for them, as well as how beneficial such an investment can be for governments and companies regarding ecological costs and their image. This thesis mainly aims to help scholars, interested in further research to deepen the knowledge on waterborne transportation in a sustainability context, but also companies and governance, looking to make waterborne transportation more sustainable.

<p>Online retail sales and grocery/food orders have been breaking records every year. As a result, third-party delivery companies have found an opportunity to get their share from the growing transportation network. Electric vehicles (EVs) are becoming a preferable choice for such large delivery systems due to their environmental benefits. However, EVs have limited-service ranges; therefore, intra-route facilities are needed for EVs to stay operational. These facilities offer charging stations for EVs and storage areas for requests, e.g., food and packages. In this dissertation, we propose a novel <em>Pickup and Delivery Problem</em> (PDP) with EVs and transfers. There are requests to be picked up and delivered. EVs leave their origin depot, serve requests, and return to their destination depot. Unlike the generic PDP, intra-route facilities allow EVs to exchange requests. Thus, a request can be transported by more than one vehicle. In this dissertation, three new problems are introduced, and the following research questions are investigated: 1) "How valuable is to include intra-route facilities and allow transfers in a pickup and delivery network with EVs?", 2) "What is the cost of locating intra-route facilities randomly rather than finding the best locations while creating the routes for EVs?", and 3) "How much can drones improve the delivery speed in a pickup and delivery network with EVs and transfers?". A <em>Mixed-integer Linear Programming</em> (MILP) model and a <em>Simulated Annealing</em> (SA) algorithm are developed and compared with each other to answer the first question. For the second question, a MILP model is formulated; however, due to unreasonable computational runtimes, a SA algorithm and an <em>Adaptive Large Neighborhood Search</em> (ALNS) algorithm are proposed. Finally, a MILP model is developed for the hybrid-fleet problem. The overall results highlight that intra-route facilities shorten the total traveled distance in the PDP network by allowing exchanges and recharging.</p>

Sustainability has become a critical issue due to global warming, scarcity of resources, and the high costs of raw materials. It is vital to reconsider linear business models and value creation processes and transition towards circularity. The growth of the electric vehicles market is promising; however, it comes with a major downside. Soon there will be a considerable number of used batteries without the original capacity and potentially hazardous that cannot go to landfill due to environmental and economic reasons. In this regard, the use of electric vehicle batteries in second life (EVBSL) is suggested as a solution. EVBSL comes with benefits such as the extension of the battery life cycle, extracting value from the remaining capacity of the battery, reduction in the upfront costs of the electric vehicle, and create new revenue streams for the companies. And since various actors are involved in EVBSL, it is essential to study this phenomenon from an ecosystem perspective. Despite the recent focus of researchers on EVBSL, there are several gaps in the current literature on this topic. The first gap concerns the challenges and enablers of implementing circular business models (CBMs) for EVBSL. The second gap concerns the second life operations of electric vehicles (EV). There is a lack of research on the solutions that can guide the ecosystem actors to manage EVBSL-related activities. And the third gap concerns the limited research on the preconditions of circular business model innovation for the EVBSL that focuses on the transition from linear business models to CBMs. Therefore, this thesis aims to develop knowledge of the factors that influence the implementation of CBMs for EVBSL from an ecosystem perspective. This study intends to address these gaps by conducting qualitative research. An exploratory research design has been deemed adequate due to its flexibility and compatibility. This research draws on the existing literature on the second life of EV batteries, and circular business models. In total, 20 interviews and 15 workshops have been conducted covering 15 companies in the EVBSL ecosystem. Purposeful sampling was employed to select the EVBSL ecosystem actors with the aim of covering the key actors such as OEMs, battery manufacturer, recycling companies, remanufacturers, energy utility companies, material supplier for battery parts, construction and housing company, and public transportation companies. The collected data was analyzed via qualitative methods such as thematic analysis.  The results of this study have led to the identification of nine key challenges and seven key enablers. Moreover, two dimensions (i.e., time frame and responsible entity) are identified from the empirical data, through which companies can structurally categorize and work with the identified key challenges and enablers. Based on this, a guiding framework is suggested that could support firms in the EV battery ecosystem to establish and manage various configurations for second-life operations in a series of phases such as firm-level initiation, ecosystem construction, firm-level optimization, and ecosystem orchestration. Finally, the current linear business models (traditional sales of products and services, product maintenance and support, R&amp;D, consultancy, and services), upcoming CBMs (regenerating, looping, and sharing), and the preconditions (for value creation, capture, and delivery) for the circular business model innovation are extracted.  This study contributes to the existing body of knowledge in several ways. It enhances the current literature on challenges and enablers of EVBSL by covering various actors in this ecosystem and extends the knowledge on the scope of these factors. Moreover, this study is the first one that suggests a guiding framework for the ecosystem actors through configurations for second-life operations while shedding light on the preconditions of circular business innovation for EVBSL. This study also provides interesting insights for practitioners and managers in the EVBSL ecosystem. / RECREATE project

Tesis por compendio / [ES] La energía juega un papel fundamental en el desarrollo sostenible de las comunidades. Así, proporcionar recursos energéticos fiables, económicamente aceptables, medioambientalmente respetuosos y socialmente beneficiosos, resulta esencial para el desarrollo sostenible de las mismas. A pesar de la universalidad de dicha definición, el uso de la energía está muy vinculada al nivel de desarrollo de los países. De este modo, la problemática energética de los países desarrollados contrasta enormemente con la de los países en desarrollo. En esta tesis doctoral se ha identificado la principal problemática energética de ambas realidades: grave impacto medioambiental de los modelos de generación del transporte tradicionales en los países desarrollados y pobreza energética en los países en desarrollo. A partir del compendio de artículos científicos de esta tesis doctoral se ha caracterizado el uso de sistemas renovables avanzados que permite solucionar dicha problemática de forma sostenible. En concreto, el principal problema energético en países desarrollados ha sido tratado mediante la planificación energética y el diseño óptimo de sistemas híbridos de energías renovables (HRES por sus siglas en inglés) en electrolineras, necesarios para la introducción de vehículos eléctricos como alternativa de movilidad sostenible. Por otro lado, el estudio de metodologías de diseño óptimas de HRES off grid y de las estufas para cocinar mejoradas mediante gasificación de biomasa se ha focalizado en la inaccesibilidad eléctrica y a sistemas de cocina limpia que sufren las comunidades en desarrollo. Así, esta tesis aporta una serie de metodologías para optimizar y adecuar los sistemas renovables presentados para el desarrollo energético sostenible de las comunidades. Además, no sólo demuestra la idoneidad de estos sistemas para dicho fin, sino también su versatilidad de aplicación en función del nivel de crecimiento de las comunidades. / [CA] L'energia juga un paper fonamental en el desenvolupament sostenible de les comunitats. Així, proporcionar recursos energètics fiables, econòmicament acceptables, mediambientalment respectuosos i socialment beneficiosos, resulta essencial per al desenvolupament sostenibles de les mateixes. A pesar de la universalitat d'aquesta definició, l'ús de la energia està vinculada al nivell de desenvolupament dels països. D'aquesta manera, la problemàtica energètica dels països desenvolupats contrasta enormement amb la dels països en desenvolupament. A aquesta tesis doctoral s'ha identificat la principal problemàtica energètica d'ambdues realitats: greu impacte mediambiental dels models de generació del transport tradicional en els països desenvolupats i pobresa energètica en els països en desenvolupament. A partir del compendi d'articles científics d'aquesta tesis doctoral s'ha caracteritzat l'ús de sistemes renovables avançats que permet solucionar aquesta problemàtica de manera sostenible. En concret, el principal problema energètic en països desenvolupats s'ha tractat mitjançant la planificació energètica i el disseny òptim de sistemes híbrids d'energies renovables (HRES, per les seues segles en anglès) en electrolineres, necessaris per la introducció de vehicles elèctrics com alternativa de mobilitat sostenible. D'altra banda, l'estudi de metodologies de disseny òptimes de HRES off grid i d'estufes per a cuinar millorades mitjançant gasificació de biomassa s'ha focalitzat en la inaccessibilitat elèctrica i a sistemes de cuina neta que pateixen les comunitats en desenvolupament. Així, aquesta tesis aporta una sèrie de metodologies per optimitzar i adequar el sistemes renovables presentats per al desenvolupament energètic sostenible de les comunitats. A més, no tan sols demostra la idoneïtat d'aquests sistemes per a aqueix fi, sinó també la seua versatilitat d'aplicació en funció del nivell de creixement de les comunitats. / [EN] Energy plays a significant role for the sustainable development of communities. Hence, supplying reliable energy resources, which result economically acceptable, environmentally friendly and socially beneficial, arises as essential for their sustainable development. Despite the universality of such definition, the energy use is highly linked to the development degree of the countries. Thus, energy problems of developed countries sharply contrast with those of developing countries. This doctoral thesis identifies the main energy issues of both realities: severe environmental impact of energy generation models for traditional transport in developed countries and energy poverty in developing countries. The compendium of scientific papers of this doctoral dissertation characterizes the use of advanced renewable energy systems to solve such problems in a sustainable way. Namely, the main energy issue in developed countries has been addressed by means of energy planning and the optimal design of Hybrid Renewable Energy Systems (HRES) in electric vehicle charging stations, which ensure the introduction of electric vehicles as a sustainable mobility alternative. Moreover, the study of methodologies for the optimal design of off grid HRES and improved cooking stoves based on biomass gasification have approached the inaccessibility to electricity and to clean cooking systems that developing communities suffer. Therefore, this thesis provides a number of methodologies to optimize and adapt the presented renewable energy systems for the sustainable energy development of communities. Furthermore, it demonstrates not only the suitability of these systems for such aim, but also their versatility of application regarding the growing degree of the communities. / Bastida Molina, P. (2021). Estudio de sistemas renovables avanzados para el desarrollo energético sostenible [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/172548 / Compendio

Text in German, summaries in English and German / Die vorliegende Forschungsarbeit befasst sich mit den Erfahrungen, die Senioren im Alter von 60plus in einem evangelischen Kindergarten im niedersächsischen Apen in der Zusammenarbeit mit Kindern machen, wenn sie ihre Ressourcen an Wissen und Zeit ehrenamtlich einbringen. Das Engagement der Senioren in der Generationenarbeit erfolgt in Form von Workshops und weiteren verschiedenen Projekten und versteht sich als gemeinwesendiakonisches Projekt in Kooperation zwischen Kirche und Kindergarten. Die Studie untersucht die subjektiven Erfahrungen der ehrenamtlich tätigen Senioren mit Kindern, die aus den intergenerationellen Begegnungen hervorgehen und deutet diese auf ihre missionstheologische Relevanz. Unter Rückgriff auf praktisch-theologische Erkenntnisse aus der Lebenswelt der Senioren gehen wichtige Ergebnisse in die in der kontextuellen Theologie und Missiologie verorteten Arbeit ein. Diese münden wiederum in praktische Empfehlungen zur generationenübergreifenden Arbeit für Kirche und Kommune. / The current study aims at investigating the experiences of elderly at the age of 60plus, when contributing with their knowledge and time during their work with children. As a research setting, an evangelic kindergarden has been selected in Apen, the northern part of Lower Saxony, Germany. The engagement of seniors in this so-called generation work is understood as a diaconal practical project which is defined as social welfare work. It is implemented in form of different projects and performed in cooperation with the church and the kindergarden. The research explores firstly, the subjective experiences of the volunteering seniors during their intergenerational encounters. Secondly, the inter generational encounters are furthermore analyzed regarding its missiological-theological relevance. Practical theological insights, gained by analyzing the seniors’ lifeworld, result as relevant for the research in the domain of contextual theology and missiology. Finally, the results lead to practical recommendations for intergenerational work for both the church and community. / Christian Spirituality, Church History and Missiology / M. Th. (Missiology)