CIB W78 2026 Conference Paper - Expert Practitioner Survey Data

Survey data for the conference paper 'Mixed-Methods Evaluation of Critical Data Requirements for Heat Pump Product Configuration' presented at CIB W78 2026 – 43rd International CIB W78 Conference on IT in Construction.

This repository is an appendix to the associated research paper (see CITATION.cff). It provides:

• the survey response data and its codebook,
• evaluation figures for each question block, most of which did not fit into the conference paper,
• descriptive and exploratory analysis tables for each question block.

This paper has a companion paper at ECPPM 2026, Critical Information Requirements for Building Service Product Selection: An Evaluation of Open Information Specification Formats, which references the survey published here. Its supplementary material — example IDS and LOIN specifications for heat pumps — is available at:

https://github.com/Design-Computation-RWTH/ecppm-2026-productSelection

Note on language. The dataset and codebook are in German, as the survey was conducted in German and no translation layer is published for the original survey data. All statistical analysis artifacts (figures and tables) in this repository appendix are however in English, matching the translated survey items as presented in the conference paper.Additionally, this README briefly describes every question block in English so the original survey data can be re-interpreted without reading German.

The survey was carried out as part of a research project funded through the Zukunft Bau research funding programme: https://www.zukunftbau.de/projekte/forschungsfoerderung/1008187-2424

ISO 16757 defines data structures for product data of technical building equipment. The survey investigates which heat pump properties practitioners need, when they need them over the course of a project, and how important they are — in order to inform the ongoing standardisation work.

The online survey was conducted with SoSci Survey, the data was collected between 13.04.2026 and 03.09.2026 at https://www.soscisurvey.de/rwth_aachen_iso16757/.

Questions were generally optional, so analyses should report the sample size of the relevant block. The six process-only records are excluded from the published dataset; all other records are retained to permit alternative inclusion criteria. The paper's analysis set can be reproduced with:

d <- read.csv("data/survey_responses.csv")
analysis <- d[!is.na(d$BE02) & d$BE02 > 0, ]   # n = 36

survey_responses.csv is a verbatim subset of the original SoSci Survey export: only whole records and columns were removed. The codebook is published unchanged and therefore also lists excluded variables.

Variable prefixes identify question blocks; _NN follows display order.

ME02 stores card positions on a continuous 0–1000 timeline divided into eight equal HOAI project phases:

ME02 and ME04 use matching item numbers and can be joined item by item. The remaining fields (CASE, timestamps, page durations, completion state and similar variables) are SoSci Survey process metadata.

The GNU R export writes checkbox values as F/T, whereas the codebook uses 1/2 (not selected/selected). For FINISHED and Q_VIEWER, F/T corresponds to 0/1.

Two scales have non-sequential codes and must be ordered by their labels:

• BE08: 1 (none), 2 (low), 5 (some), 3 (considerable), 4 (much).
• RN04 and RN08: 1, 2, 3, 5, 6, 7; code 4 is unused.

QUESTNNR identifies the full (iso16757_umfrage) or shortened (iso16757_umfrage_kurz) questionnaire. The shortened version omitted:

These responses remain published but are not part of the paper analysis. Their reduced sample size must be considered in reuse.

The unchanged codebook still lists these fields. Six unanswered records were also removed. Original CASE numbers were retained and are therefore not consecutive.

This project was funded by the Federal Institute for Research on Building, Urban Affairs and Spatial Development on behalf of the Federal Ministry for Housing, Urban Development and Construction, using funds from the Zukunft Bau research funding programme. We want to thank our project partners for their versatile support.

Data and figures are licensed under CC-BY-4.0 — see LICENSE.

CC BY 4.0 is one-way compatible with the CC BY-SA 4.0 licence of the project report: this material may be reused in the report and in other ShareAlike works, provided attribution is given. The reverse does not hold.

See CITATION.cff, or use the "Cite this repository" button on GitHub.