Supplementary Material: Survey Instrument and Aggregated Results for "An Empirical Analysis of Design Principles and Functional Requirements for Data Trustees"

This dataset contains the supplementary material for the research paper "An Empirical Analysis of Design Principles and Functional Requirements for Data Trustees", presented at the 59th Hawaii International Conference on System Sciences (HICSS-59) in 2026. This document presents the complete questionnaire and the aggregated survey results from an expert study on the design and technical requirements for data trustees. It includes Likert scale items, multiple-answer questions, and associated visualizations (bar charts) that illustrate the collective responses. This is the blinded version intended for the review process. After the blind review, an updated (authorized) version may be uploaded under the same DOI via Zenodo’s versioning system. This dataset provides the full empirical foundation of the study, enabling transparency and reproducibility. It includes: The Complete Survey Instrument: The full questionnaire distributed to data trustee experts, structured according to the Data Intermediation Services Taxonomy. Aggregated Survey Results: A compilation of the 35 valid expert responses, including Likert scale ratings and multiple-choice answers. Visualizations: Detailed bar charts and divergent bar charts illustrating the level of agreement among experts regarding the hypotheses on trust, security, monetization, and technical infrastructure. If you use this dataset or questionnaire, please cite the associated HICSS-59 paper:Steinert, M., & Tebernum, D. (2026). An Empirical Analysis of Design Principles and Functional Requirements for Data Trustees. Proceedings of the 59th Hawaii International Conference on System Sciences.