https://jau.vgtu.lt/index.php/JCEM <p>The Journal of Civil Engineering and Management publishes original research that seeks to improve civil engineering competency, efficiency and productivity in world markets.&nbsp;<a href="https://journals.vilniustech.lt/index.php/JCEM/about">More information ...</a></p> Vilnius Gediminas Technical University en-US Journal of Civil Engineering and Management 1392-3730 <p>Copyright © 2021 The Author(s). Published by Vilnius Gediminas Technical University.</p> <p>This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.</p> https://jau.vgtu.lt/index.php/JCEM/article/view/23114 <p>This study investigates the reliability of monodiscipline IFC/BIM models in public construction projects of educational facilities through advanced clash detection and quantitative analysis. Data were collected from BIM models of two kindergartens and a school in Vilnius, Lithuania, representing different design disciplines. A mixed-methods approach was employed to analyse the number, types, and geometric characteristics of detected clashes. The research introduces innovative metrics, such as the Relative Quality Coefficient (RQC), Relative Uncertainty Coefficient (RUC), and Modified Relative Quality Coefficient (MRQC), to assess model quality and reliability quantitatively. The findings reveal a direct relationship between model complexity, clash detection precision, and the number of identified clashes, underscoring the importance of enhanced quality control measures in IFC/BIM models for public procurement. The study concludes that the implementation of these novel metrics can enhance the reliability of IFC/BIM models, thereby optimizing the design and construction process.</p> Michał Juszczyk Mantas Vaišnoras Robertas Kontrimovičius Tomáš Hanák Hanna Łukaszewska Leonas Ustinovichius Copyright (c) 2025 The Author(s). Published by Vilnius Gediminas Technical University. http://creativecommons.org/licenses/by/4.0 2025-01-20 2025-01-20 31 1 1–19 1–19 10.3846/jcem.2025.23114