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As the number of social media users continues to rise globally, a heated debate emerges on whether social media use improves or harms mental health, as well as the bidirectional relation between social media use and mental health. Motivated by this, the authors’ study adopts the stressor–strain–outcome model and social compensation hypothesis to disentangle the effect mechanism between social media use and psychological well-being. The purpose of this paper is to address this issue.

To empirically validate the proposed research model, a large-scale two-year longitudinal questionnaire survey on social media use was administered to a valid sample of 6,093 respondents recruited from a university in China. Structural equation modeling was employed for data analysis.

A longitudinal analysis reveals that social media use positively (negatively) impacts psychological well-being through the mediator of nomophobia (perceived social support) in a short period. However, social media use triggers more psychological unease, as well as more life satisfaction from a longitudinal perspective.

This study addresses the bidirectional relation between social media use and psychological unease. The current study also draws both theoretical and practical implications by unmasking the bright–dark duality of social media use on psychological well-being.

Generic quality management system standard ISO 9001 and the automotive quality management system standard IATF 16949 both require organisations to demonstrate continual improvement in their customer satisfaction and the number of non-conformities identified during quality system audits. However, the long-term trends of these two parameters under ISO 9001 and IATF 16949 standards are not researched so far. It is expected that under continual improvement, organisations will achieve a step-function/stair-case shaped pattern. This study evaluates if this expectation is true when long-term performance of certified organisations is assessed.

A longitudinal exploration of three organisations certified to ISO 9001 standard and three certified to IATF 16949 standard is done. The observations are further substantiated using secondary data for the same ten years period about customer satisfaction of the major automobile manufacturers.

It is observed that none of the two indicators, i.e. the customer satisfaction and number of non-conformities, in any of the six organisations show step-wise/stair-case type improvement. All indicators followed random up and down patterns like ocean waves. It is paradoxical that certified organisations are claiming continual improvement and are remaining certified but there is actually no long-term improvement.

Longitudinal studies for the generic quality management standard ISO 9001 and the quality system standard for automotive sector IATF 16949 are rare. The revelation about ocean wave patterns observed in the long-term trends for customer satisfaction and the number of non-conformities in ISO 9001 and IATF 16949 certified organisations is a startling finding. It is outlandishly different from the conventional perception of a staircase-styled continual improvement pattern expected a priori in certified organisations.

The authors examine the longitudinal relationship between work satisfaction and life satisfaction, and the moderating role of work ethic.

The authors use a nationally representative sample of Dutch working adults (N = 1020; three waves over five years) and take a model comparison approach to identify the longitudinal relationship between work satisfaction and life satisfaction. To test the moderating effects of work ethic, the authors use conditional process analyses.

The authors find more evidence as to how work satisfaction and life satisfaction are positively and reciprocally linked over time using longitudinal data. More importantly, work ethic strengthens the positive effect of work satisfaction on life satisfaction, but no such moderating role is observed as to the effect from life satisfaction to work satisfaction.

The findings raise awareness that employees' overall happiness in life matters to workplace satisfaction. More importantly, one effective strategy to promote work satisfaction is to design work that nurtures strong work ethic – measures that help employees see more value in their work.

The findings regarding the role of work ethic show that the conservation of resources theory can be an informative lens to understand the work–life satisfaction relationship. For individuals with strong work ethic, work satisfaction constitutes a more salient form of psychological resources benefiting their overall life satisfaction.

Competition among seaports is rapidly increasing due to various factors such as the global recession, resurgence of COVID-19, tight environmental regulations of IMO, sharp rise in ocean freight charges, increasing global uncertainties and growth in ship sizes. It is essential to have precise knowledge of shipping companies' port selection factors to secure the competitive advantage of seaports. This study aims to empirically analyze recent changes in the importance of port selection factors.

By employing a longitudinal study, this study conducted the t-test analysis. The first survey was conducted from January 2005 to April 2005. Then, the second survey was conducted in May 2021.

First, the importance of port facilities (berth length and the number of berths, shed and terminal areas, possession of adequate equipment and maximum berth size) increased significantly. Second, while ship and cargo safety were the critical port service factors in previous studies, speed, flexibility and reliability for handling cargo and berthing schedule were found to be crucial in this study. Third, the importance of ship arrival/departure frequency, route diversity and ship arrival/departure information systems increased when shipping companies selected the port.

This study has academic significance in that it reveals the changing importance of port selection factors in the 2020s and has taken the form of a longitudinal study on the importance of port selection factors from 2005 to 2021, moving beyond the cross-sectional approach. This study can provide valuable insights into and implications for port policymakers and managers when developing and formulating port policies and strategies.

Lean management is a suitable methodology for companies that want to improve their productive performance and competitiveness. This study aims to research levels of implementation and internalisation of Lean production tools in Spanish manufacturing companies, and explores differences in behaviour between SMEs and large companies based on data gathered over three time periods. The correlation between Lean adoption and company performance is also analysed.

Company survey data for the years 2012, 2015 and 2018 collected from 354 respondents were used to conduct a longitudinal study on the level of lean tool adoption and internalisation in manufacturing companies.

Over the years, the use of Lean tools has increased, whereas levels of internalisation have remained stable. Lean tool use in SMEs and large companies show significant differences in 2012 and 2015, but this is no longer the case 2018. Results also show that higher Lean tool use helps increase return on sales (ROS), and higher levels of internalisation of tools helps reduce the number of products rejected.

To date, there are no known studies on the use and internalisation of Lean tools or their correlations with business performance indicators in Spanish manufacturing companies.

Recent construction literature has been focusing more on integrative contracting approaches such as integrated project delivery (IPD). However, conceptual studies on integration in IPD literature are scattered and fragmented, that is, most of the studies only focused on the segmented dimension of integration. A systemic understanding of the concepts of integration in IPD project-based context is still lacking. To fill this gap, this paper analyzes two aspects of integration (dimensions and directions) in IPD literature and explores their extent in construction projects.

Grounded theory review and focus group discussion approaches were employed to perform a thorough conceptual review of the literature, frame the research into the theory and increase the fundamental understanding of the concept of integration in IPD literature.

In this study, IPD integrating techniques were identified and their integration dimensions and directions were discussed. Results show that integration in the project-based environment of IPD is a multidimensional construct. Based on organizational, contractual and operational characteristics of IPD projects, twenty-four integration mechanisms were identified and framed into seven clusters. The integration directions over project life-cycle were demonstrated in three contexts: (1) an on-site construction project, delivered traditionally, (2) an on-site construction project, delivered with IPD and (3) an off-site construction project, delivered with IPD.

This paper gathers the segments of integration into a comprehensive overview, which can help researchers and practitioners explore elements of IPD project success more precisely. A theoretical framework of integration clusters is developed, based on IPD literature. The impact of IPD on on-site versus off-site construction is illustrated from an integration direction perspective. Finally, future areas of studies for researchers and practitioners about the concept of integration in an IPD context are discussed. This paper provides a point of departure for future theoretical and empirical explorations.

Lens of conservation of resources (COR) theory has been used to study how organizations can create resource passageways for their employees via managers. This has been examined in cross-cultural virtual work teams distributed across time and space within the high-resource loss context of the COVID-19 pandemic.

Longitudinal field design was used in a transnational organization involving data collection at three times over eight months. At Time 1, qualitative methodology was used to propose a conceptual model. At Time 2 and Time 3, an online survey was used to collect data for 205 virtual work teams across 10 countries in the Asia–Pacific region pre and post “manager as coach” training respectively.

Using COR theory, the study highlights that “manager as coach” training is an effective resource for managers in the high resource depletion context of the pandemic. Access to timely support increases saliency for the resource-gain spiral and has a cross-over impact on virtual work team outcomes suggesting transferability of resources from managers to subordinates. Also, managers across all nationalities view coaching training as an equally valuable resource.

The study provides evidence for investment in timely and relevant support for managers to positively and swiftly impact virtual work teams during high-resource loss contexts.

The study expands COR crossover theory across space and time dimensions using a longitudinal field research design.

Using longitudinal data, this study aims to provide a greater understanding as to how parenting factors, including the employment of various disciplinary techniques, during a young person's early adolescence may contribute to excessive Internet use (EIU) in later adolescence.

Employing “Problem Behaviour” theory (PBT) as a guiding framework, this study uses data from the Growing Up in Ireland ’98 Cohort to investigate the effect of proximal and distal parental influences, measured when children were 13 years old, on symptoms of EIU in young adults at 17 or 18 years. Multiple regression models control for other child and family factors, and separate models for males and females examine sex differentials.

Estimation did not find a statistically significant association between internet-specific mediation practices in early adolescence and EIU in later adolescence. However, regularly playing games or sports together is a protective factor. Parent-adolescent conflict and spending time home alone are estimated as risk factors. How parents deal with misbehaviour is a strong predictor of EIU, with the direction of association dependent upon the type and frequency of discipline employed.

The findings are of practical significance in informing parents of modifiable aspects of their behaviour that can lead to EIU.

The study applies a longitudinal modelling framework and considers the effect on EIU of various parental disciplinary techniques, representing a novel contribution.

The goals of this review are to identify key theories, constructs and themes in the international business travel (IBT) literature and to propose a model based on findings, theories and constructs drawn from adjacent research literature.

The authors reviewed the business travel (BT) literature to identify conceptual and empirical articles on IBT published from 1990 to 2022. Only 53 publications were suitable for review. The authors reviewed them using an open coding system.

The IBT literature is dispersed across several disciplines that use different methods, focus on different aspects of travel and emphasize different positive and negative outcomes that IBT engenders. The publications employed a diverse range of methods, including review and conceptual (11), quantitative (28) and qualitative methods (14). The samples were diverse in country, age, marital status and tenure. Many publications were descriptive and exploratory. The few that based their research on theory focused on two stress theories: Job Demands-Resources (JD-R) theory and conservation of resources (COR) theory.

Experimental and longitudinal designs are needed to reduce the causal ambiguity of this body of mostly correlational and cross-sectional research. The authors discuss the impact of emerging advances in virtual global communication technology on the future of IBT.

More research is needed on positive aspects of IBT. Human resource (HR) people should be aware of these issues and are encouraged to decrease the deleterious aspects of the international trips and increase the positive ones.

Increasing well-being of international business travelers is important for the travelers, their families and the organization.

This is the first IBT review focused on the theoretical underpinnings of research in the field. The authors offer a model for IBT and introduce adjustment and performance as important constructs in IBT research. The authors encompass crossover theory to add the reciprocal impact of travelers and spouses and label IBT a “double-edge sword” because it arouses both positive and negative outcomes.

The purpose of this study is to investigate the phonological metathesis phenomenon in the early speech of Arabic-speaking children. Based on analysis of a longitudinal data from 11 children's speech, the study mainly aims at investigating (1) the characteristics/nature of the phonological metathesis process in early child speech and (2) how it is different from adult phonological metathesis. The study explores the causes behind the metathesis phonological process in child speech.

This paper explored the phonological metathesis phenomenon based on a longitudinal study of 11 monolingual Arabic speakers of Yemeni-Ibbi Dialect (YIA) and cross-linguistic data from various languages.

The data analysis showed that metathesis phenomenon in child speech has several characteristics. It occurs at an early age, at 2 years and decreases with age. It was found that metathesis occurs mostly in disyllabic and trisyllabic words or more complex syllabic words, but metathesis rarely occurs in monosyllabic words in children's speech. The results indicated that unlike metathesis in adult speech, metathesis in children's speech occurs in undeliberate, slow, fast speech. The study explored that adjacency of sounds with similar phonological features, the ease of pronunciation, or the sonority effect are the motivations that trigger metathesis phenomenon to occur in child speech.

In the literature, the metathesis phonological process has got a little attention from researchers, and this is due to the rare cases of metathesis and the inconsistency of cases and the occurrence of metathesis. However, there is no consensus among the researchers about the causes of emergence and the occurrences behind the metathesis process. However, this study argues that the metathesis process has unique characteristics in child speech in comparison to adult speech and that there are some causes for metathesis to occur in human speech particularly in children's data such as adjacency of sounds with similar phonological features or sonority effect.