“…Services are characterised as uncertain and complex (van der Valk and Rozemeijer, 2009;Wynstra et al, 2018), which makes specification, evaluation, and procurement difficult for the client (Wynstra et al, 2018). Since engineering services typically involve the development of creative solutions to emergent challenges (Pirzadeh et al, 2021), these services are important for the public sector in the development of society (Benabdellah et al, 2020). Furthermore, engineering services play an essential role in the success of construction projects (K€ arn€ a and Junnonen, 2017) and they are typically performed in highly iterative and cyclical processes, which adds to the uncertainty (Mitchell et al, 2011;Benabdellah et al, 2020).…”