PurposePrior research has emphasised the importance of the early phases of construction projects, as well as the difficulties of procuring engineering services – especially due to the uncertainties. Despite that, studies on the public procurement of engineering services are scarce. Although scholars have shown that uncertainty may affect the choice of control modes, the level of uncertainty that characterises services is not addressed by the two task characteristics: knowledge of the transformation process and output measurability. The purpose is to investigate organisational control in public procurement of engineering services.Design/methodology/approachThe existing control model was adjusted in this study by conceptually adding uncertainty as a third aspect to the two task characteristics. A single case study of the Swedish Transport Administration was used. The empirical data, comprising 14 interviews with managers from the client and engineering consulting companies, were analysed using flexible pattern matching and visual mapping approaches and then illustrated using the model.FindingsThe public client did not base its choice of control modes on uncertainty, but rather on the other two task characteristics. Consequently, the service providers argued that the chosen control modes reduced their creativity, increased their financial risks and caused unclear responsibilities. This study therefore shows that uncertainty is an important factor to consider in the choice of control modes, both from a theoretical perspective and from the service providers' point of view. The developed model may therefore be useful for researchers as well as practitioners.Originality/valueThis study is the first attempt to add uncertainty as a task characteristic when choosing control modes. The results contribute to the scarce control literature regarding the procurement of engineering services for construction projects and the procurement of other services with high uncertainty.

Many studies have emphasized the importance of engineering services and their adaptability to reduce carbon emissions in the construction sector. As public clients procure these services, selecting efficient (procurement-related) control modes is critical. However, studies of control modes and their effect on adaptability are scarce. The purpose of this study is to investigate how, through the choice of control modes, a public client may create incentives for service providers to deliver carbon reduction solutions in the construction phase. In this study, a procurement model and a classification model are developed, and a single case study of an engineering service contract aiming for carbon reduction is used to illustrate the models. The empirical data include 16 interviews with respondents from the 2 contract parties, i.e., the client and service provider. The findings show that it is important to create incentives for adaptability when procuring engineering services with the aim of reducing carbon emissions in the construction phase. The findings also highlight the importance of these incentives being created both in relation to the selection of service providers and to the responsibility between the contract parties. The models developed in the study may serve as important tools for both practitioners and researchers.