Public administration reform has become a universal and increasingly common phenomenon. In that sense, there are many proposals put forward by different authors, with very different approaches, on the elements to be reformed. The thesis brings a different approach by addressing the problem from the organisation theory, on the premise that the challenges that public administrations must face in the 21st century must be addressed from contemporary organisational models. Among the possible models to be explored, the thesis relies on Frédéric Lalouxs interpretative framework for organisational innovation, based on progressive stages of development where the Evolutionary or `Teal Organisations represent the most advanced state, characterised by three operating principles: Self-management, Wholeness, and Evolutionary Purpose. With the help of this reference framework, the purpose of the thesis is to identify organisational elements of public administrations on which action can be taken to improve their performance. To this end, it examines the existence and implementation patterns of organisational innovation practices inspired by evolutionary organizations (Teal practices) in public administrations, with particular attention to the Spanish case. It also looks at the aspects that characterise performance in public administrations and how it can be assessed (leading to its own model based on four dimensions: Results, Relations, Operations and Capacity building), and the effect that the Teal practices examined have on this performance. The thesis includes a comparative case study of organisational innovation in public administrations, looking at four experiences: the Belgian Federal Public Service for Social Security, the Municipal Music Conservatory of Barcelona, the Unit A.2 of the Executive Agency for Small and Medium-Sized Enterprises (EASME) of the European Commission, and the European Court of Auditors. This study shows some elements common to the four experiences: the emergence of an activating event triggering change, the openness of leaders to new ways of working, and a pragmatic approach to acting on aspects not covered by the rules. The thesis also comprises the statistical analysis of the responses provided by public employees of Spanish administrations to an online questionnaire on the existence of Teal practices in their organisations, which includes elements to assess individual and organisational performance. The questionnaire was applied to two different groups, as a generic questionnaire open to public employees from the national, regional and local administrations, and as a specific questionnaire for workers of the Andalusian Agency for International Cooperation for Development (AACID), and their replies were compared to provide the Agency with guidance in its assessment of the possible implementation of agile and humanistic practices. The analysis of the generic questionnaire showed a low degree of implementation of Teal practices among Spanish public administrations, with a pattern of implementation which, instead of complying with the three Teal principles, corresponds better to a five-factor model: Community and values, Trust, Hierarchy, Tasks assignment and Meetings management. Of these, structural equations modelling found that only practices associated with Trust and Hierarchy factors have a positive and direct influence on organisational performance, and that those associated with Community and values also have a positive but indirect influence through individual performance. The results of the thesis confirm that it is possible to start the transition to more evolved organisational paradigms in public administrations by introducing Teal practices. In this transition, considering the starting point and effect on performance, practices associated with the Community and values dimension appear as the most promising ones. RESUMEN La reforma de la Administración se ha convertido en un fenómeno universal y cada vez más frecuente. En este sentido, son muchas las propuestas planteadas por diferentes autores, con enfoques muy diversos, sobre los elementos a reformar. La tesis aporta una aproximación diferente abordando el problema desde la teoría de la organización, bajo la premisa de que los retos a los que la Administración debe hacer frente en el siglo XXI deben abordarse desde modelos organizativos contemporáneos. Entre los posibles modelos a explorar, la tesis se apoya en el marco interpretativo de la innovación organizativa de Frédéric Laloux, basado en etapas progresivas de desarrollo donde las Organizaciones Evolutivas o Teal representan el estado más avanzado, caracterizado por tres principios de funcionamiento: Autogestión, Plenitud y Propósito evolutivo. Con la ayuda de este marco de referencia, el objetivo de la tesis es identificar elementos organizativos de la Administración sobre los que es posible actuar para mejorar su desempeño. Para ello, examina la existencia y las pautas de implantación de prácticas de innovación organizativa inspiradas en las Organizaciones Evolutivas (prácticas Teal) en la Administración, con especial atención al caso español. Asimismo, estudia también los aspectos que caracterizan el desempeño en la Administración y cómo puede evaluarse (dando lugar a un modelo propio basado en cuatro dimensiones: Resultados, Relaciones, Operaciones, y Desarrollo de capacidades), y el efecto que tienen sobre este desempeño las prácticas Teal examinadas. La tesis incluye un estudio comparativo de casos de innovación organizativa en la Administración donde se examinan cuatro experiencias: el Servicio Público Federal de la Seguridad Social de Bélgica, el Conservatorio Municipal de Barcelona, la unidad A.2 de la Agencia Ejecutiva para pymes de la Comisión Europea (EASME) y el...