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This paper sets out to critically review the requirements of Quantity Surveyors (QSs) for collaborative BIM engagement and success. The paper has been set in the context of the Irish QS and his reluctance to actively and collaboratively engage in the 5D QS BIM process (5D –the fifth Dimension designated to QSs). A literature review was undertaken to establish the reasons for this lack of QS engagement. The data from these reviews was collected and analyzed and distilled into the main chal-lenges that required resolution to engage QS participation in the 5 D BIM process. A mixed research methodology based on the principles of Fourth Generation Evaluation was em-ployed as this allowed for both Quantative and Qualitative Analysis. The Focus group members was carefully chosen for “haven been through the mill” haven experienced first-hand knowledge of the bar-riers faced by QSs as well as for their pro-active interest in engaging and advocating 5D BIM to the highest standards. Different stakeholders were chosen to get different perspectives and views on the problems which were mainly identified as people, process and technology as well as proposals on how the problems might be rectified and by whom. The results were encouraging, none of the issues were considered insurmountable given time and resources and BIM maturity. The findings were summarized as a lack of a Government Mandate, lack of awareness and upskilling, cultural and collaboration issues. Lack of understanding of the different disciplines, QSs lack of ICT skills and lack of fully functioning and integrated 5D QS BIM software. The BIM world for the QS’s is changing rapidly through the impact of emerging technologies and the Fourth Industrial Revolution. This will be accelerated by the imminent Irish Government Mandate An-nouncement of Office of Public Procurement (OGP) Mandate on Band 5 Projects from Q2 2019 followed by OGP Band 3 in Projects Q2 2020. The implementation of NBC” Roadmap to Digital Transition For Ireland’s Construction Industry 2018-2021” will seek to collaboratively resolve many of the issues and challenges facing the Irish QS. However, a key challenge still remains specifically around 5D QS MVD (Model View Definition). There is no universal QS MVD as this would require the adoption of an industry standard approach to costing and different countries, disciplines and segments have their own unique approach to costing. The Irish QS needs to collaborate with other designers and software vendors to develop a QS MVD to harvest the full benefits of what BIM Can offer. The future is full of new opportunities for the QS’s who become 5D BIM enabled, they can deliver new services such as carbon & energy costing , cost data analytics, extend QS reach into new areas spanning complete asset lifecycle.