[EN] Knowledge Representation has been defined as a set of ontological rules provided with the capacity to perform inference. It basically consists of a set of symbols that represent a specific domain, enriched with a set of functions to perform reasoning. This reasoning aims to perform inference, most of times based on the use of any kind of logics. Ontologies represent one of the most widely used schema representations. They are mainly used in the Knowledge Engineering, Artificial Intelligence and the Computer Science fields. The main problem with the Knowledge Representation from a semantic point of view, is the complexity of the processes of creation, management, maintenance and reusability of the ontological models. The automatic support to the processes that manage the knowledge, usually have to face diverse problems during the modelling process. These problems affect the comprehension and the development of these ontological models, causing complex and unefficient processes and low levels of reusability of these ontologies. The current tools that support these processes, have diverse problems, due to they are not robust enough to efficiently develop all the tasks involved in the workflows. This thesis has taken this problematic as its starting point. It aims to develop the processes for developing and managing the life cycle of ontologies based on a Visual Analytics approach, where the user becomes to be the central point in the analysis process. Furthermore, all the mechanisms involved in this approach, have been defined taking into account, the user and his interaction with the computers. These mechanisms, make easier the analytical reasoning, because they maximise the human capacity to perceive and understand about complex and dynamic data sets. The processes involved in the ontologies’life cycle, describe the whole sequence of activities in the workflows, to create, manage and reuse ontologies. These activities and workflows have been defined taking into account the main methodologies for developing ontological models. Moreover, each of these activities and workflows, is supported by Visual Analytics and interaction techniques. The user interaction represents a crucial aspect for developing ontologybased data models. The user, supported by computer mechanisms, defines the representation of a certain domain using an ontological model. These mechanisms, are completely defined according to the human capabilities to perform abstraction, conception, understanding, learning and knowledge representation. This user-centered approach, represents the main approach taken of the Visual Analytics field. Through this thesis, all the workflows for developing ontology-based data models are completely described and detailed. Furthermore, all the mechanisms implemented in a tool called OWL-VisMod, that support the development of these processes are also described. These mechanisms have been evaluated based on two approaches: the first one is the usability of the tool, and the second one is the functionality of the tool and all the visualisation and interaction techniques. The usability evaluation consists of the development of the creation process of an ontological model, according to the proposed tasks. This development has been performed by a group of users that evaluate the usability of the tool. On the other hand, the functionality evaluation has been performed, first, through an analysis process of an existing ontology, and second, through the creation of a new data ontological model, according to the workflows defined to these processes. This creation process has been developed over a real scenario, of a recommend system for tourism activities. This evaluation has let to perform diverse tests of the tool, about its capacity to cover all the functionality aspects needed for a real-scenario system. The results of these evaluations, have indicated firstly, that the processes, workflows and the defined tasks, are coherent to the defined objectives. Secondly, the functionality evaluation in the case-study, has let to detect diverse aspects that were improved or fixed, as well as the validation of the tool and the diverse visualisations and interaction techniques., [ES] Este trabajo de tesis se enmarca dentro del área de la Representación del Conocimiento; más específicamente, en la Ingeniería de Ontologías. Este trabajo de investigación incluye la definición de los principales procesos involucrados en la gestión del ciclo de vida de las ontologías (creación, mantenimiento, análisis y reutilización), así como la implementación de una herramienta que soporte todos estos procesos, basada en un enfoque de Analítica Visual, en la que el usuario representa el eje central en el proceso de análisis. Esta propuesta de herramienta, denominada OWL-VisMod, ha sido validada con dos evaluaciones: una evaluación de funcionalidad con un caso de estudio en colaboración con una empresa, así como una evaluación de usabilidad con un grupo de estudiantes de máster de la Universidad de Salamanca.