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Previous studies have indicated that career variety offers numerous benefits in the work environment; however, knowledge regarding the mechanisms that retain employees with diverse career experiences is scant. Drawing on person–environment (P–E) fit theory and the job crafting perspective, this study aims to explore the relationship between career variety and turnover intention, and the roles of job crafting and HR innovators and integrators in this relationship.

This study examines the nonlinear effect of career variety on turnover intention using survey data collected from 509 employees (Study 1) and 346 employees and their supervisors (Study 2) in China.

Career variety and turnover intention exhibited an inverted U-shaped relationship – mediated by job crafting. Additionally, the HR innovator and integrator moderated the relationship between career variety and job crafting. When the HR innovator and integrator were strong, employees engaged in more job crafting at intermediate levels of career variety.

The findings not only deepen our understanding of the inherent capabilities and preference traits of employees with diverse career backgrounds but also enrich the body of research on career variety, reconcile inconsistencies across previous studies and offer new insights into strategic organisational interventions for retaining a workforce with varied career experiences.

Recent emerging information technologies like digital twin (DT) provide new concepts and transform information management processes in the architecture, engineering and construction (AEC) industry. Although numerous articles are pertinent to DT applications, existing research areas and potential future directions related to the state-of-the-art DT in project operation and maintenance (O&M) are yet to be studied. Therefore, this paper aims to review the state-of-the-art research on DT applications in project O&M.

The current review adopted four methodological steps, including literature search, literature selection, science mapping analysis and qualitative discussion to gain a deeper understanding of DT in project O&M. The impact and contribution of keywords and documents were examined from a total of 444 journal articles retrieved from the Scopus database.

Five mainstream research topics were identified, including (1) DT-based artificial intelligence technology for project O&M, (2) DT-enabled smart city and sustainability, (3) DT applications for project asset management, (4) Blockchain-integrated DT for project O&M and (5) DT for advanced project management. Subsequently, research gaps and future research directions were proposed.

This study intends to raise awareness of future research by summarizing the current DT development phases and their impact on DT implementation in project O&M among researchers and practitioners.