Occupational stress factors in visual display terminal (VDT) operation: a review of empirical research

A review of the literature involving empirical research (experimental and field investigations) on stressful aspects of visual display terminal (VDT) operation is presented. Studies reviewed included assessment of visual fatigue and/or performance, musculoskeletal symptoms and operator attitudes towards job demands and quality of working life. In addition, some investigation included discussions and evaluations of the physical attributes of VDT workplaces; including ergonomic factors (task lighting, glare conditions, anthropometric configuration of VDT and accompanying furniture), environmental factors (temperature, humidity, radiation) and psychosocial factors (job demand, work content, work-rest schedules).

The literature reveals that levels of visual and musculoskeletal complaints among VDT operators are high. Moreover, ergonomic field assessment of VDT workplaces indicate that the majority of those examined were suboptimal with respect to existing recommendations regarding lighting, glare control and anthropometric dimensions of screen, keyboard, desk and chair. Nevertheless, evidence of causal linkages between specific ergonomic attributes of the workplace and specific patterns of symptomatology are lacking.

Finally, work demand and task structure attributes to the VDT operation were demonstrated to have strong effects on incidences of reports of visual and postural symptoms as well as on psychosocial attitudinal indicators. Hence, it is argued that approaches toward stress reduction must include job content as well as ergonomic factors.     

The analysis of stress and strain at the videotex workplace

Analyses of work demands, stress and strain were carried out at videotex workplaces in the laboratory and in private households. The demand analysis showed that a high degree of information resolution and accuracy during information reception leads to high strain and eye fatigue. This effect is increased by a heavy flicker of the CRT screen, an inadequate choice of colour contrast, an inadequately low CRT resolution, and an inadequately small distance between the worker and the screen. High demands in the field of information processing are caused by the degree of difficulty in extracting relevant information from the videotex system using the search trees. In addition, the application of a checklist for CRT workplaces indicates more than 30 design faults. The analysis of the subjective perception of strain showed a significant decrease of the motivation levels following videotex sessions, and a significant increase of the strain level. The only individual factor to increase during videotex sessions was self-confidence. A comparison with findings of Udris and Barth (1976) showed that even videotex sessions which are much shorter than an eight-hour working day result in strain reactions similar to those occurring for eight hours of card-punching.     

The analysis of stress and strain at the videotex workplace

Abstract

Analyses of work demands, stress and strain were carried out at videotex workplaces in the laboratory and in private households. The demand analysis showed that a high degree of information resolution and accuracy during information reception leads to high strain and eye fatigue. This effect is increased by a heavy flicker of the CRT screen, an inadequate choice of colour contrast, an inadequately low CRT resolution, and an inadequately small distance between the worker and the screen. High demands in the field of information processing are caused by the degree of difficulty in extracting relevant information from the videotex system using the search trees. In addition, the application of a checklist for CRT workplaces indicates more than 30 design faults. The analysis of the subjective perception of strain showed a significant decrease of the motivation levels following videotex sessions, and a significant increase of the strain level. The only individual factor to increase during videotex sessions was self-confidence. A comparison with findings of Udris and Barth (1976) showed that even videotex sessions which are much shorter than an eight-hour working day result in strain reactions similar to those occurring for eight hours of card-punching.     

New Information Technologies,Job Profiles,and External Workload as Predictors of Subjectively Experienced Stress and Dissatisfaction at Work

Implementation cycles of information technologies in modern workplaces have become shorter, and employees have to constantly adapt to changing work situations. Presented here are preliminary results from a comprehensive research project. The 2nd Vienna Implementation Study, which investigated the effects on workers of continuous implementations, that is, the implementations of new information technologies on workplaces already equipped with computers. In a longitudinal research design, strain and dissatisfaction of 466 employees in 10 different companies are investigated. In each company, an implementation of a new information technology occurs during a specified time period. Seven measurements are taken over a 22-month period. Contextual factors postulated to moderate employee reactions to the new information technology include the following: type of implementation, implementation style (e.g., implementation management, participation) job profiles, external workload of employees, and personality factors. Preliminary analyses of the first two measurements of subjectively experienced stress and dissatisfaction (2 subscales representing strain and job satisfaction) in 9 companies are presented here. Compared to a control sample (the first 2 measurements in companies in which the implementation has not occurred), employees in the implementation sample had an increase in subjectively experienced stress and no changes in dissatisfaction shortly after the implementation. Both preimplementation values and changes in subjectively experienced stress and dissatisfaction seemed to be highly influenced by contextual factors at an organizational level. Regarding job characteristics (decision latitude) and external workload (e.g., family, children, and household responsibilities), employees with low decision latitude at their workplaces and a high external workload showed the strongest increases in subjectively experienced stress after the implementation....     

Insights about mental health aspects at intralogistics workplaces – A field study

The present field study investigated mental health aspects at intralogistics workplaces, as cognitive and social demands have largely changed in this branch. Within a cross-sectional, mixed methods study design, forty-one intralogistics employees completed a survey about their working conditions and mental states. Further, nine workers participated in a systematic, qualitative group interview to obtain intralogistics specific job resources and job demands. The results were compared to known mechanisms from a long-established psychological model (the Job-Demands and Resources model, JD-R model) to evaluate if these general assumptions still apply at modern working conditions. As expected and in line with the JD-R model, regression analyzes supported that job resources predicted work engagement (p < .05) and job demands predicted burnout symptoms (p < .001) even at modern intralogistics workplaces. However, no interaction effects (Job Demands X Job Resources) were found. The qualitative interviews highlighted several job demands and job resources, which were reported as especially relevant for modern intralogistics workplaces by the participants. Based on the findings, practical recommendations were evolved for the improvement of mental health at intralogistics workplaces. Job resources, for example process transparency or respectful and esteeming leadership behavior, can be increased in order to improve work engagement. Job demands, for example task interruptions, excessive time pressure or profuse exposure to physical stress should be controlled to reduce burnout symptoms.     

Factors affecting the appreciation generated through applying human factors/ergonomics (HFE) principles to systems of work

This retrospective study examined the levels of appreciation (applause) given by clients to Human Factors/Ergonomic (HFE) specialists after they have modified the systems of work. Thirteen non-academic projects were chosen because the HFE interventions involved changed the way workers work at their workplaces. Companies involved range from multi-national corporations and military organizations with thousands of employees to small trading companies with less than 10 employees. In 5 cases the HFE recommendations were fully adopted and well appreciated. In 4 they were largely ignored and not appreciated, with partial adoption and some appreciation in the other 4 cases.     

Continuous evaluation of participants’ perceptions of impact: Applying a boundary object in organizational‐level interventions

Workplaces across Europe experience increasing problems with work‐related strain and stress. Consequently, they are confronted with the need for stress‐preventive interventions that target the sources of stress. A matter of current debate is how to continuously evaluate an organizational‐level intervention and gain insight into progress and participants’ perceptions of its impact; however, empirical data are lacking. Therefore, we conducted a qualitative study in three workplaces—two in information technology (IT) and one in manufacturing—to explore the design, evaluation process, perceived impact, and employees’ experiences with the continuous use of a physical evaluation tool (visualization object) during an organizational‐level intervention process. We conducted observations, surveys, semi‐structured interviews and chronicle workshops across all three workplaces. Overall, the results showed that the visualization object proved successful as a tool to explicate and combine participants’ perceptions of impact. The evaluation process also clarified that participants initially had different understandings of the intervention's purpose. However, the study also showed that the visualization object facilitated a dialog among participants, converging the different understandings to create a shared understanding and compliance of purpose. Finally, the respondents reported that the evaluation tool acted as a collective reminder of the intervention and the related changes. We conclude the study by providing recommendations for future evaluations of participatory organizational‐level interventions.     

The effect of improved workplace design on the development of work-related musculo-skeletal illnesses

An earlier paper (Westgaard and Aaras, 1984) described the work environment and the health situation of production workers at a small Norwegian factory, prior to an extensive ergonomics effort which primarily aimed to reduce static muscle strain by constructing new workplaces. It was concluded that the old work situation significantly contributed to a high level it musculo-skeletal disorders, most likely because the old work situation made it necessary to work with high level of muscle load for long periods of the working day. This second paper concerns the other important query which initiated Have the extensive ergonomics and environmental efforts at this factory had any effect in terms of improved health of the workers? The factory, the old workplaces and the ergonomics adaptations were described in the preceding paper, and are therefore not included here.     

Quantitative postural load assessment for whole body manual tasks based on perceived discomfort

Many Korean workers are exposed to repetitive manual tasks or prolonged poor working postures that are closely related to back pain or symptoms of musculoskeletal disorders. Workers engage in tasks that require not only handling of heavy materials, but also assuming prolonged or repetitive non-neutral work postures. Poor work postures that have been frequently observed in the workplaces of shipbuilding shops, manufacturing plants, automobile assembly lines and farms often require prolonged squatting, repetitive arm raising and wrist flexion and simultaneous trunk flexion and lateral bending. In most manufacturing industries, workers have to assume improper work postures repetitively, several hundreds of times per day depending on daily production rate. A series of psychophysical laboratory experiments were conducted to evaluate the postural load at various joints. A postural load assessment system was then developed based on a macro-postural classification scheme. The classification scheme was constructed based on perceived discomfort for various joint motions as well as previous research outcomes. On the basis of the perceived discomfort, postural stress levels for the postures at individual joints were also defined by a ratio scale to the standing neutral posture. Laboratory experiments simulating automobile assembly tasks were carried out to investigate the relationship between body-joint and whole-body discomfort. Results showed a linear relationship between the two types of discomfort, with the shoulder and low back postures being the dominant factor in determining the whole body postural stresses. The proposed method was implemented into a computer software program in order to automate the procedure of analysing postural load and to enhance usability and practical applicability.     

Quantitative postural load assessment for whole body manual tasks based on perceived discomfort

Many Korean workers are exposed to repetitive manual tasks or prolonged poor working postures that are closely related to back pain or symptoms of musculoskeletal disorders. Workers engage in tasks that require not only handling of heavy materials, but also assuming prolonged or repetitive non-neutral work postures. Poor work postures that have been frequently observed in the workplaces of shipbuilding shops, manufacturing plants, automobile assembly lines and farms often require prolonged squatting, repetitive arm raising and wrist flexion and simultaneous trunk flexion and lateral bending. In most manufacturing industries, workers have to assume improper work postures repetitively, several hundreds of times per day depending on daily production rate. A series of psychophysical laboratory experiments were conducted to evaluate the postural load at various joints. A postural load assessment system was then developed based on a macro-postural classification scheme. The classification scheme was constructed based on perceived discomfort for various joint motions as well as previous research outcomes. On the basis of the perceived discomfort, postural stress levels for the postures at individual joints were also defined by a ratio scale to the standing neutral posture. Laboratory experiments simulating automobile assembly tasks were carried out to investigate the relationship between body-joint and whole-body discomfort. Results showed a linear relationship between the two types of discomfort, with the shoulder and low back postures being the dominant factor in determining the whole body postural stresses. The proposed method was implemented into a computer software program in order to automate the procedure of analysing postural load and to enhance usability and practical applicability.     

Visual accommodation changes in VDU-operators related to environmental lighting and screen quality

Abstract

Visual problems involved in the operation of display units have been investigated in several studies (Höller et al. 1975, Läubli et al. 1980). The results of these studies indicate mainly that visual tasks using VDU terminals may induce temporary effects in the visual accommodation system. There are, however, suggestions that visual impairment of the task depends, among other factors, particularly on workstation lighting and screen quality (Östberg 1978, Läubli et al. 1980).

In the present pilot study an attempt was made to investigate possible relations between (i) operators' accommodation changes after six hours work at a display unit and (ii) work-station lighting and screen characteristics. The measurements were carried out in two separate field studies at a Telecom Directory Enquiry Center. Operator's visual accommodation before and after work, workplace lighting, luminance contrasts and screen qualities of 29 display screen operators were measured during day and night shifts. Field laser optometry was used for determining the state of visual accommodation. Photometric and radiometric characteristics of the display screens were measured using an EG & G spectrometer-photometer.

The study revealed a low significant relationship between lighting conditions on the one side and incidence of accommodation changes on the other. More operators showed over-accommodation when working at workplaces with higher luminance contrast. The influence of screen characteristics, such as screen illuminance, luminance and irradiance upon visual accommodation were evident during the night shift.     

An overview of work analysis instruments for hybrid production workplaces

With increasing technological improvements, production processes are becoming more and more automated. Nevertheless, full automation is improbable in the medium term since human abilities cannot yet be completely replaced. Therefore, it is likely that so-called hybrid human–robot teams will assume the future production. This raises questions regarding the shaping of future production and the effects it will have on the employees, workstations, and the companies as a whole. The project “Work in the Industry of the Future” (ARIZ) addresses the entirely new cooperative relationship between man and technology in the Industry 4.0 and its impact on opportunities for the work force. To derive the requirements and effects of hybrid workplaces, an initial work analysis of existing workplaces with varying levels of technological enhancement (manual workplaces, workplaces with co-existing robots and fully automated workplaces) will be conducted. Multiple standardized work analysis instruments that vary in method, duration, level of analysis, and recorded characteristics already exist. This paper gives an overview of an assortment of these methods that can be used in production.     

Facilitating participatory steps for planning and implementing low-cost improvements in small workplaces

In this paper, practical means of facilitating participatory steps taken in workplace improvement programs in small workplaces were reviewed. The reviewed programs included those organized by partners of our Asian inter-country network for small enterprises, construction sites, home workplaces and agricultural farms. Trainers who commonly acted as facilitators were found to play multiple roles in helping managers, workers and farmers take initiative and achieve immediate improvements. The participatory steps were more successfully facilitated when the trainers supported (a) building on local good practice, (b) focusing on a range of basic ergonomics principles, and (c) stepwise progress through feedback of achievements. The use of action-oriented toolkits comprising low-cost action checklists and group work guides was commonly helpful. The locally adjusted nature of the toolkits seemed essential. Trainers could thus help people build local initiative, plan and implement low-cost ideas through serial group work steps and confirm benefits in a stepwise manner. The review of the results suggested that a local network of trainers trained in the use of locally adjusted toolkits was vital for facilitating effective improvements in different small workplaces.     

Feminism asks the “Who” questions in HCI

In this brief personal essay, I describe some of the ways that feminism has influenced my life as a researcher and practitioner in HCI and CSCW - in the creation of work to be read by others, in the critical reading of works that were created by others, and in the planning and framing of practical work in enterprise workplaces. I discuss three variations of “Who” questions that feminism helps us to ask in HCI: The “who” of the identity of the user; the “who” of the identity of organizational actors; and the “who” of the practitioner or researcher.     

A review of physical exercises recommended for VDT operators

This paper presents an evaluation of exercises that have been recommended for the prevention of musculoskeletal discomfort among VDT/office workers. 127 individual exercises were analysed for their suitability for performance in VDT workplaces. Additionally, each exercise was judged in terms of its safety and its compliance with principles of physiotherapy. Results showed that, in the majority of cases, the prepared instructions for the exercises were satisfactory and the exercises could be readily performed at the workstation. However, over a third of the exercises were conspicuous and potentially embarrassing to perform, and half would significantly disrupt the work routine. Additionally, a number of the exercises posed potential safety hazards, exacerbated biomechanical stresses common to VDT work, or were contraindicated for persons with certain health problems. These findings suggest a need for greater attention to both the practical and the therapeutic aspects of exercises promoted for VDT users.     

Information systems for sustainable remote workplaces

This review discusses the challenges associated with the sustainability of remote workplaces, which have become more prevalent due to the growing trend of work digitalization and the pandemic-induced push to remote work. These challenges are highlighted in literature across various disciplines, including information systems, but these discourses have remained isolated from each other. In this review, we consolidated and synthesized research on remote work from the perspective of individual workers by reviewing 187 articles published between 1999 and 2020 in recognized academic journals from fields including information systems, organizational studies, economics, human resources, sociology, and psychology. We identified five key themes that concern opportunities and challenges to sustainable remote workplaces: (1) key characteristics, (2) work-life boundaries; (3) health and well-being; (4) social interaction, and (5) leadership. Building on our findings we created a framework that recognizes two interrelated categories of factors influencing remote workplace sustainability – rigid base characteristics and contextual remote workplace variables – that together shape the trajectory of remote workplace sustainability in the long term. The framework also identifies the potential role of information systems in modulating the impact of the base characteristics to build continuities that encourage more sustainable remote workplaces. The paper concludes by offering a research agenda for information systems for sustainable remote workplaces based on the three IS theoretical frames: inclusion, dignity, and boundary objects.     

Relationships between job organisational factors,biomechanical and psychosocial exposures

The relationships between work organisational, biomechanical and psychosocial factors were studied using cross-sectional data from a pooled dataset of 1834 participants. The work organisational factors included: job rotation, overtime work, having second jobs and work pace. Task and job level biomechanical variables were obtained through sub-task data collected in the field or analysed in the laboratory. Psychosocial variables were collected based on responses to 10 questions. The results showed that job rotations had significant effects on all biomechanical and most psychosocial measures. Those with job rotations generally had higher job biomechanical stressors, and lower job satisfaction. Overtime work was associated with higher job biomechanical stressors, and possibly self-reported physical exhaustion. Those having second jobs reported getting along with co-workers well. Work pace had significant influences on all biomechanical stressors, but its impact on job biomechanical stressors and psychosocial effects are complicated.

Practitioner Summary: The findings are based on a large number of subjects collected by three research teams in diverse US workplaces. Job rotation practices used in many workplaces may not be effective in reducing job biomechanical stressors for work-related musculoskeletal disorders. Overtime work is also associated with higher biomechanical stressors.     

The work compatibility improvement framework: an assessment of the worker–work environment interaction in the manufacturing sector

The manufacturing sector in the US is challenged by high health care costs and shortage of qualified workers, which are largely attributed to the degree of fit between the worker and work environment. In this regard, a healthy worker–work environment interface is a necessary and sufficient condition for the containment of health care costs and the retaining/attraction of highly qualified knowledge workers and should be based on the principles of optimum physical, cognitive and emotional health for the workers. In prior research, the Work Compatibility Improvement Framework (WCIF) was introduced as a vehicle to address these issues and was defined as the identification, improvement and maintenance of the well-being characteristics of the workforce and its interaction with the work environment through the application of engineering, medicine, management and human sciences methodologies, technologies and best practices. This paper advances WCIF by examining its applications in manufacturing with regard to the evaluation of working conditions impacting musculoskeletal/stress outcome measures. A study was conducted in a machining department of a bag packaging manufacturer in the Midwest of the United States. The work tasks were planned and executed with regard to the following aims: (1) to compute work compatibility as a function of work demands and energisers; (2) to establish whether the prevalence of musculoskeletal/stress disorders increases with a decrease in the quality of worker–work environment interface in terms of work compatibility level and other work factors such as shift and job category. A major finding is that a ‘poor’ work environment (a function of all work domains) results in musculoskeletal/stress disorders that are 105% and 67% higher than those for a ‘good’ work environment. The evening shift exhibited the poorest compatibility followed by the night shift relative to the day shift. Application of the work compatibility approach demonstrated the detection of non-added value work. It is essential to evaluate the various domains of worker–work environment interface to uncover the root causes that tend to sub-optimise the physical/cognitive/emotional health of the workforce. The WCIF was used to uncover the non-value added effort in the work process. These findings will have major implications for developing and implementing customised design interventions with the aim to maximise the benefit and reduce the cost of employees in a manufacturing enterprise. The study findings suggest that the WCIF should be pursued as a potential strategic tool for optimising human performance in an enterprise to create healthy workplaces.     

The work compatibility improvement framework: an assessment of the worker-work environment interaction in the manufacturing sector

The manufacturing sector in the US is challenged by high health care costs and shortage of qualified workers, which are largely attributed to the degree of fit between the worker and work environment. In this regard, a healthy worker-work environment interface is a necessary and sufficient condition for the containment of health care costs and the retaining/attraction of highly qualified knowledge workers and should be based on the principles of optimum physical, cognitive and emotional health for the workers. In prior research, the Work Compatibility Improvement Framework (WCIF) was introduced as a vehicle to address these issues and was defined as the identification, improvement and maintenance of the well-being characteristics of the workforce and its interaction with the work environment through the application of engineering, medicine, management and human sciences methodologies, technologies and best practices. This paper advances WCIF by examining its applications in manufacturing with regard to the evaluation of working conditions impacting musculoskeletal/stress outcome measures. A study was conducted in a machining department of a bag packaging manufacturer in the Midwest of the United States. The work tasks were planned and executed with regard to the following aims: (1) to compute work compatibility as a function of work demands and energisers; (2) to establish whether the prevalence of musculoskeletal/stress disorders increases with a decrease in the quality of worker-work environment interface in terms of work compatibility level and other work factors such as shift and job category. A major finding is that a 'poor' work environment (a function of all work domains) results in musculoskeletal/stress disorders that are 105% and 67% higher than those for a 'good' work environment. The evening shift exhibited the poorest compatibility followed by the night shift relative to the day shift. Application of the work compatibility approach demonstrated the detection of non-added value work. It is essential to evaluate the various domains of worker-work environment interface to uncover the root causes that tend to sub-optimise the physical/cognitive/emotional health of the workforce. The WCIF was used to uncover the non-value added effort in the work process. These findings will have major implications for developing and implementing customised design interventions with the aim to maximise the benefit and reduce the cost of employees in a manufacturing enterprise. The study findings suggest that the WCIF should be pursued as a potential strategic tool for optimising human performance in an enterprise to create healthy workplaces.     

Coping with information overload in email communication: Evaluation of a training intervention

The present paper introduces three facets of information overload in email communication: A large amount of incoming information, inefficient workflow, and deficient communication quality. In order to cope with these facets of information overload, a training intervention was developed and evaluated. Data were collected from 90 employees on several evaluation levels within a longitudinal evaluation design (one pretest double posttest design). The results reveal that the training contributed to an increase in knowledge and media competencies. We also found evidence for a transfer of training contents to the workplace. Finally, strain diminished on several dimensions. In particular, problems with media usage and work impairment decline significantly, an effect that was stronger for those participants who face a large amount of email at their workplaces.