HOAI (Honorarordnung für Architekten und Ingenieure) is a regulation governing the fees for architectural and engineering services. This thesis addresses the challenges arising from its implicit sequential phase model, which shows limitations in increasingly complex and dynamic project environments. The growing need for flexibility in planning and decision-making processes makes the development of alternative approaches necessary. The aim of the thesis is to provide recommendations for a holistic and agile approach. To this end, a current “as-is” process model is analyzed, objectives and requirements for a “to-be” process model are derived, and the extent to which an adaptation of agile values and methods is appropriate is examined. Based on a systematic literature review and a SWOT analysis, the implicit HOAI phase model was selected and investigated as the current framework. The analysis shows that while the waterfall logic of HOAI proves effective where requirements are stable and well-defined, it reveals significant weaknesses particularly in the early and dynamic phases of projects. Guided expert interviews and a qualitative content analysis identified key objectives and requirements. These confirm the importance of maintaining a phase-based structure as an orienting framework, while simultaneously demanding flexibility, iteration, stronger collaboration, and the involvement of relevant stakeholders. The empirical data provide insights into how a target process model should be designed from an expert perspective. On this basis, a potential solution is proposed in the form of a hybrid approach that integrates agile values and methods. By introducing a parallelized, Scrum-based phase concept for HOAI up to phase 4, representing approval planning, this approach enables greater transparency, flexibility, and user orientation.      «

HOAI (Honorarordnung für Architekten und Ingenieure) is a regulation governing the fees for architectural and engineering services. This thesis addresses the challenges arising from its implicit sequential phase model, which shows limitations in increasingly complex and dynamic project environments. The growing need for flexibility in planning and decision-making processes makes the development of alternative approaches necessary. The aim of the thesis is to provide recommendations for a holist...     »