PurposeAccording to relational contract theory, relational governance has potential to improve public-private partnership (PPP) infrastructure project sustainability. The main purpose of this research is to investigate the association between relational governance and the sustainability of PPP infrastructure projects. Further, this study examines the mediating effect of managerial innovation and the moderating role of public involvement.Design/methodology/approachResearch data were collected from 158 valid questionnaires completed by Chinese PPP professionals. Structural equation modeling (SEM) was then employed to test five hypotheses.FindingsResults indicate a positive correlation between relational governance and PPP infrastructure project sustainability. This linkage is regulated by public involvement. In addition, managerial innovation plays a mediating role between relational governance and the sustainability of PPP infrastructure projects.Originality/valueThis study verifies the relationship between relational governance and PPP infrastructure project sustainability, as well as intermediary and regulatory factors, providing a new approach to achieving sustainability in PPP infrastructure projects.

PurposeThe risks and uncertainties of public–private partnership (PPP) projects threaten their sustainability. Contract flexibility, which is based on the theory of incomplete contract and transaction cost, may be a viable solution to this issue. The purpose of this study is to investigate the relationship between contract flexibility and the sustainability performance of PPP projects. The multiple mediating roles of justice perception and cooperation efficiency are assessed, thereby allowing the pathways and conditions to be understood more comprehensively for improving the sustainability performance of PPP projects.Design/methodology/approachNine hypotheses in the proposed research model are tested via structural equation modeling using data acquired from 218 Chinese PPP professionals.FindingsResults show that contract flexibility positively affects PPP project sustainability performance. Justice perception and cooperation efficiency play direct and sequential mediating roles in this effect.Originality/valueThis study validates that contract flexibility positively impacts the sustainability performance of PPP projects, where justice perception and cooperation efficiency serve direct and sequential mediating roles. The findings of this study contribute to an improved understanding of the effect of contract flexibility on the sustainability performance of PPP projects. Furthermore, they provide important theoretical and practical insights into contract management as well as beneficial information and valuable initiatives for improving the sustainability of PPP projects.

Although innovation orientation is identified as an effective strategy to enhance an enterprise's competitive advantage, its mechanism remains to be investigated. This study divides the fuzzy front‐end (FFE) activities of new product development (NPD) projects into idea generation, concept definition, and initial planning and investigates the transmission path between innovation orientation and competitive advantage through these three activities. Additionally, we explore the moderating role of internal competition. This empirical study is based on 261 respondents from China. The results suggest that innovation orientation has a positive impact on FFE activities, and these promote competitive advantage. The mediating role of FFE activities in the relationship between innovation orientation and competitive advantage is confirmed. The results also reveal that internal competition regulates the relationship between innovation orientation and FFE activities in an inverted U‐shape. The study further reveals the internal mechanism of innovation orientation on competitive advantage and provides a deeper understanding of the link between them. The study guides research and development (R&D) management practitioners in managing FFE activities and rationalizing internal competition to enhance NPD success.