CC BY-NC-ND 4.0Grohnert, AnneAnneGrohnertJohn, MichaelMichaelJohnHäusler, BennyBennyHäuslerGiertz, ChristianChristianGiertzKraufmann, BenBenKraufmannKlose, StefanStefanKloseKlaus, ConradConradKlaus2025-07-152025-07-152025https://doi.org/10.24406/publica-4879https://publica.fraunhofer.de/handle/publica/48952110.5220/001337860000391110.24406/publica-4879Design and implementation of real care processes is a complex task, where the information model is central and serves as a basis for further implementation of the overall IT system. In this contribution, we describe the process of modeling study-specific structures on the base of FHIR in the OrthoKids project. The OrthoKids project is a clinical study aimed at establishing an orthopedic preventive medical examination for children. We explain how FHIR was used for modeling the data and in what form it is used, ending in summarizing our experiences we made when modeling the OrthoKids study with FHIR.enSystem Design and DevelopmentHealth InformaticsHL7 FHIRDigital Clinical Trialsconference paper