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The purpose of this study is to investigate the structural relationship model among narcissism, work centrality, employee engagement and discretionary effort.

Respecting the quantitative approach, the data were gathered by means of the survey completed by 1,190 respondents of Generation X, Y and Z working in the Thai service and manufacturing industries.

The findings of the study indicated positive associations between narcissism and work centrality, narcissism and employee engagement, work centrality and employee engagement and employee engagement and discretionary effort. It was observed that work centrality played a partially mediating role in the relationships between narcissism and employee engagement, while employee engagement fully mediated the associations between work centrality and discretionary effort, as well as between narcissism and discretionary effort. The structural model demonstrated variations across different generational cohorts, suggesting that the relationships differed among generations. However, the model did not exhibit any variations across different types of industries. Furthermore, the findings from the Thai samples indicated that generational differences had a moderating effect on the path relationships between narcissism and work centrality (with Generation Y having a stronger effect compared to Generation Z and Generation X), narcissism and employee engagement (with Generation Y having a stronger effect compared to Generation Z and Generation X) and narcissism and discretionary effort (with Generation X having a stronger effect compared to Generation Y and Generation Z), all with a significance level of 95%. Additionally, the relationship between employee engagement and discretionary effort showed a significant difference across generations, with Generation Z exhibiting a stronger effect compared to Generation Y and Generation X, at a significance level of 99%.

This study provides empirical evidence supporting the positive relationships between narcissism and work centrality, as well as narcissism and employee engagement, contrary to previous research findings. The results reveal that employee engagement fully mediates the associations between work centrality and discretionary effort, as well as between narcissism and discretionary effort, offering valuable contributions to the existing literature. Furthermore, this study expands on previous research by examining the moderating effect of industry type, specifically comparing manufacturing and service industries. The findings suggest that the model exhibits variations across different generational cohorts, highlighting the importance of considering generational differences in understanding these relationships. However, the model does not exhibit variations across different types of industries.

The purpose of this paper is to examine the structural relationship model among transformational leadership, sustainable leadership (SL), lean manufacturing practices and sustainability performance.

The data were collected from the middle and senior managers working in small and medium enterprises of Thai manufacturing industry. Regarding the quantitative approach, the data were collected by means of survey from 598 respondents from 374 companies. Qualitative data were collected from 40 participants by participant observation, non-participant observation and in-depth interview.

The model reported that lean manufacturing has a partial mediate effect on the relationship between transformational leadership and sustainability performance, and between SL and sustainability performance. The structural model is different in automotive and nonautomotive companies, and the structural model is different among the companies which implemented lean program for less than five years and above five years. The data from in-depth interview informed that lean practices are appropriate for automotive industry though with less implementation in other industries. Firms pay most attention on customer involvement with some attention on employee and supplier involvement. Managers give advices and exchange ideas with their followers rather than inspiring and giving opportunities to make decision.

The findings may also enable Thai managers to realize that lean practices are appropriate for any industry. The first thing to do before launching lean program to all process is that the company should buy-in the understanding of managers about lean concept and implementation. Willingness with well understanding and realizing importance of lean program will lead to superior results, especially operational, economic and sustainable performance.

The reliability and validity measurements confirmed that both SL and environmental and social performance are appropriate for manufacturing industries. This study provides evidence of the positive relationship between SL and lean manufacturing, lean manufacturing and sustainability performance, as well as the partial mediate effect of lean manufacturing on the relationship between SL and sustainability performance, which are the additional contributions to research in academic field. The results confirmed the positive relationship between transformational leadership and lean manufacturing. The results reported that there is difference of lean practices between automotive and nonautomotive companies, and between companies which implemented lean program less than five years and above five years. The structural relationship result reported that transformational leadership has effects on lean manufacturing whereas SL has no effect on lean manufacturing, which asserted the previous study in which one leadership model is more appropriate for success within lean implementations.