Off-site construction (OSC) has been recognized as an approach to transform the construction sector from a labor-intensive to a modernized and green industry. Despite a number of advantages, the development of OSC still remains its infancy in China due to various interactive barriers. Some studies have been conducted to explore the barriers to the OSC adoption. However, very few studies attempted to investigate the complex interrelationships among these barriers. In order to fill this gap, this study adopts Interpretive Structural Model (ISM) technique to explore the interrelationships amongst barriers to the OSC adoption in China. Firstly, critical barriers were identified through literature review and semi-structured interviews with various stakeholders. Then, the overall structure amongst barriers was revealed through ISM technique. By using the Matrice d'Impacts Croise's Multiplication Appliquée a Classement (MICMAC) technique, the barriers were classified into four groups according to their driving-power and dependence power. The results indicate that specific attentions should be given to inadequate policy and regulations, lacking knowledge and expertise, dominated traditional project process as well as low standardization. The research findings provide valuable information for policy-makers on the overall structure amongst barriers. These results shed lights on effectively developing measures to facilitate the OSC adoption in the construction sector.

Purpose This study aims to investigate the influence of contractual flexibility on different types of conflict, determine if contractual flexibility is significantly correlated with project success between contracting parties, verify the mediating effect of project conflicts on the relationship between contractual flexibility and project success and examine the relationship between different types of conflicts and project success in megaprojects. Design/methodology/approach A theoretical model was developed and a structured questionnaire survey was conducted with 468 professionals. The structural equation modeling technique was used to analyze the data. Findings The results showed that both types of contractual flexibility – term and process flexibility – were correlated with and significantly positively affected project success, and term flexibility was found to have a greater influence. The introduction of project conflicts significantly weakened the relationship between contractual flexibility and project success, verifying the partial mediating effect of conflicts. All types of project conflicts play a destructive role in achieving project success; relationship conflict had the largest negative effect. Contractual flexibility affects two paths with respect to project success: the direct path (contractual flexibility → project success) and the indirect path (contractual flexibility → conflict → project success). The direct effect of contractual flexibility on project success is positive; the corresponding indirect effect is negative. The direct effect is greater than the corresponding indirect effect. Research limitations/implications Different types of conflicts may mutually transform to extent certain degree. However, this study did not address the potential influence of conflict transformation on project success. The results implied that more emphasis should be placed on contractual terms, particularly on developing flexible terms in the contractual document, when implementing megaprojects. Meanwhile, this study reveals the effects of conflicts on project success in megaprojects, which provides a useful reference for project stakeholders to avoid the negative effect of conflicts. Practical implications This study provides a better understanding of the relationship between contractual flexibility, types of conflicts in megaprojects and a reliable reference for the project manager to effectively deal with these related issues. This implies the contracting parties strengthen communication and cooperation to establish a trust mechanism, while reducing the negative influence of project conflicts and enhancing the positive effect of contractual flexibility. Originality/value Few studies have investigated the effects of contractual flexibility on conflict and project success in megaprojects; this study contributes significant theoretical and practical insights to contract management and conflict management and provides a reliable reference to achieve project success.

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