Rethinking the Paradigm and Practice of Occupational Health in a World Without Decent Work: A Perspective From East and Southern Africa.

The global political economy is generating new forms and growing shares of informal, insecure, and precarious labor, adding to histories of insecure work and an externalization of social costs. The COVID-19 pandemic has highlighted the consequences of ignoring such signals in terms of the increased risk and vulnerability of insecure labor. This paper explores how such trends are generating intersecting adverse health outcomes for workers, communities, and environments and the implications for breaking siloes and building links between the paradigms, science, practice, and tools for occupational health, public health, and eco-health. Applying the principle of controlling hazards at the source is argued in this context to call for an understanding of the upstream production and socio-political factors that are jointly affecting the nature of work and employment and their impact on the health of workers, the public, and the planet.

Female healthcare workers and the Covid-19 pandemic in Brazil: a sociological analysis of healthcare work. / Trabalhadoras da saúde face à pandemia: por uma análise sociológica do trabalho de cuidado.

The article aims to discuss the care provided by female healthcare workers in Brazil during the Covid-19 pandemic, based on a sociological analysis by authors who discuss such care as devalued and poorly paid work performed to a large extent by low-income women. The work involves social constructions of emotions and has used the body as a work instrument in care for others. In addition, the increasingly precarious nature of health work in Brazilian society, aggravated in recent decades, with an increase in temporary contracts, loss of labor rights, overload of tasks, and adverse work conditions, among others, adds to the increase in medical and hospital care in the Covid-19 pandemic. In this context, female healthcare workers experience lack of personal protective equipment, fear of coronavirus infection, concerns with their children and other family members, and illness and death of coworkers and themselves. The article highlights the need for government attention and management of healthcare work and professional societies, analyzing the work conditions female healthcare workers are experiencing in confronting the pandemic.

Este texto tem como finalidade discutir o cuidado de trabalhadoras da área da saúde em face da Covid-19, sob a análise sociológica de autoras que o vêm discutindo enquanto um trabalho que é desempenhado, na sua maioria, pelas mulheres das classes populares, é desvalorizado e sofre baixa remuneração. É uma atividade que envolve as construções sociais das emoções e tem utilizado o corpo como um instrumento de trabalho no cuidado com o outro. Além disso, a precarização do trabalho em saúde na sociedade brasileira acirrada nas últimas décadas, como o aumento de contratos temporários, perdas de direitos trabalhistas, a sobrecarga das atividades, condições de trabalho precárias, dentre outros, soma-se com o aumento dos atendimentos médico-hospitalares diante da pandemia da Covid-19. Neste contexto, as trabalhadoras em saúde vivenciam as ausências de equipamentos de proteção individual, medo de contaminação pelo vírus, preocupações com filhos e familiares, vivências diante da morte e do adoecimento de si e de colegas de profissão. Este texto aponta para a necessidade de atenção governamental, bem como para a gestão do trabalho em saúde e dos órgãos de classe profissional, analisando as condições de trabalho que as trabalhadoras em saúde estão vivendo no enfrentamento da pandemia.

Trabalhadoras da saúde face à pandemia: por uma análise sociológica do trabalho de cuidado / Female healthcare workers and the Covid-19 pandemic in Brazil: a sociological analysis of healthcare work

Resumo Este texto tem como finalidade discutir o cuidado de trabalhadoras da área da saúde em face da Covid-19, sob a análise sociológica de autoras que o vêm discutindo enquanto um trabalho que é desempenhado, na sua maioria, pelas mulheres das classes populares, é desvalorizado e sofre baixa remuneração. É uma atividade que envolve as construções sociais das emoções e tem utilizado o corpo como um instrumento de trabalho no cuidado com o outro. Além disso, a precarização do trabalho em saúde na sociedade brasileira acirrada nas últimas décadas, como o aumento de contratos temporários, perdas de direitos trabalhistas, a sobrecarga das atividades, condições de trabalho precárias, dentre outros, soma-se com o aumento dos atendimentos médico-hospitalares diante da pandemia da Covid-19. Neste contexto, as trabalhadoras em saúde vivenciam as ausências de equipamentos de proteção individual, medo de contaminação pelo vírus, preocupações com filhos e familiares, vivências diante da morte e do adoecimento de si e de colegas de profissão. Este texto aponta para a necessidade de atenção governamental, bem como para a gestão do trabalho em saúde e dos órgãos de classe profissional, analisando as condições de trabalho que as trabalhadoras em saúde estão vivendo no enfrentamento da pandemia.

Abstract The article aims to discuss the care provided by female healthcare workers in Brazil during the Covid-19 pandemic, based on a sociological analysis by authors who discuss such care as devalued and poorly paid work performed to a large extent by low-income women. The work involves social constructions of emotions and has used the body as a work instrument in care for others. In addition, the increasingly precarious nature of health work in Brazilian society, aggravated in recent decades, with an increase in temporary contracts, loss of labor rights, overload of tasks, and adverse work conditions, among others, adds to the increase in medical and hospital care in the Covid-19 pandemic. In this context, female healthcare workers experience lack of personal protective equipment, fear of coronavirus infection, concerns with their children and other family members, and illness and death of coworkers and themselves. The article highlights the need for government attention and management of healthcare work and professional societies, analyzing the work conditions female healthcare workers are experiencing in confronting the pandemic.

Midwifery students' experiences of bullying and workplace violence: A systematic review.

BACKGROUND: Workplace violence directed at registered midwives in the maternity setting has been a recognised issue since the early 1990s. More recently it has become evident that midwifery students are also victims of bullying and harassment whilst on clinical placement. Due to the short and long-term impacts this has on students, it is likely to have a detrimental effect on the future and sustainability of the midwifery profession. As a basis for designing a response, it is important to understand what is currently known about this phenomenon. AIM: To systematically review the literature to identify what is known about workplace violence and bullying experienced by midwifery students whilst on clinical placement. METHOD: Reporting of this review followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. A search was undertaken of all primary research that focussed upon workplace violence and bullying involving midwifery students whilst on clinical placement, published between January 1990 and December 2019. Pre-defined terms were used to search the following five databases: CINAHL, Web of Science, MEDLINE, Embase, supplemented with Google Scholar. Additional manual searches of reference lists were conducted. An assessment of the quality of each eligible study was then undertaken using an appropriate mixed methods appraisal tool (MMAT). Extracted data were then synthesised using thematic synthesis. FINDINGS: Nine articles met the criteria for inclusion in the review. Studies were primarily qualitative, with some reporting descriptive statistics that do not enable key issues such as prevalence to be reliably addressed. The synthesis identified four main themes that related to workplace violence and bullying of midwifery students whilst on clinical placement. Results were clustered around the role of power in bullying, prevalence and impacts, the culture of compliance, and the victim's response. CONCLUSIONS AND IMPLICATIONS FOR PRACTICE: A broader understanding of the nature of workplace violence and bullying and how it manifests itself is beginning to emerge, but more and higher quality research is required to establish an empirical base on which to design interventions. Studies suggest that bullying is common and has significant impacts at both a personal and professional level.  This strongly reinforces a need for greater policy and organisational responses to bullying in the clinical education context, in order to break the bullying cycle and ensure the midwives of the future remain in the profession and sustain the workforce.

The Rise of Shop Floor Ergonomics: A Personal Perspective.

OCCUPATIONAL APPLICATIONS Based on a 45-year career as a practitioner in industrial ergonomics, I offer in this paper a personal memoir on how ergonomics came to the shop floor in North America, involving ordinary workers in an early effort to prevent what was at the time an unknown problem - work-related Musculoskeletal Disorders. The actions included the beginning of a low-tech, practical improvement process that is still effective today. In total, the experience can provide encouragement to everybody to be confident in their ability when trying new endeavors and to remember that small initial steps can eventually lead to major change.

Perceptions of benefits and barriers to Yoga practice across rural and urban India: Implications for workplace Yoga.

BACKGROUND: Even though Yoga is useful for prevention of obesity, diabetes and hypertension it is not universally practiced. The purpose of the study was to determine the benefits and barriers confronted by the community members while incorporating Yoga into routine practice and at workplace. OBJECTIVE: This study explored the motivators and barriers to Yoga practice by estimating how these elements can be useful for development and incorporation of Yoga as a workplace activity and as a profession. METHODS: A nationwide multi-centered prospective study was conducted recruiting individuals of different age groups and geographical zones in India. Participants of Yoga intervention group were administered a questionnaire with 19 items on benefits (YBS) and 18 items on barriers for Yoga practice (BFYS). Data was analyzed using SPSS v21 software. RESULTS: Majority of the participants perceived Yoga improves "physical fitness", "relaxes mind and body", improves "stamina", across age groups. "Lifestyle", "Family commitments", "Physical over-exertion", "No Encouragement from family", "Occupational commitments" and "Few places to do Yoga" were perceived barriers across various geographical zones. Despite knowing the benefits of Yoga, these barriers prevented individuals from integrating it into their daily routine. CONCLUSIONS: The present study may be considered as a starting point for development of Yoga as a workplace activity and a profession based on the perceptions of its various benefits and barriers faced by a large study population spanning an entire nation.

Shift length and working practices in UK hospital settings: An online survey of heads of midwifery.

OBJECTIVE: There is currently a lack of data that records how midwives are expected to work in hospital settings. The aim of this study was to determine the prevalence of 12-h shifts and current working practices of hospital-based midwives. DESIGN: An online survey conducted between December 2018 and March 2019. Descriptive data are summarised regionally and nationally. SETTING: NHS Trusts providing maternity services in hospital settings in the UK PARTICIPANTS: The link to the survey was emailed to Heads of Midwifery in 155 NHS Trusts FINDINGS: Responses were received from 94 of the 155 NHS Trusts (60.65%). Some responses included data for more than one hospital, so results are summarised for 97 hospitals. 12-h shifts were the most prevalent shift length, with only 4.1% of hospitals still routinely operating shorter shifts. 55% of hospitals limit the maximum number of consecutive shifts to three, but this can be influenced by different factors. More than half of midwives (55.67%) will be rostered to start a day shift within 24-h of finishing a night shift. 70% of hospitals do not currently record the number of midwives working beyond their contracted hours but 68% report formal methods of recording missed rest breaks. Regional differences were seen in the use of other personnel to support the midwifery workforce. CONCLUSIONS: Shift schedules and the lack of formal methods to record the number of midwives working beyond their contracted hours may be a cause for concern due to the potential impact on recovery times. Further research is required to explore how working practices may affect midwives and their ability to provide care for women and their babies.

The mediating role of thriving: Mindfulness and contextual performance among Turkish nurses.

AIMS: To examine the role of thriving in the relationship between mindfulness and contextual performance. BACKGROUND: Thriving has been known as one of the most important components in the professional development of nurses. Previous studies have also shown that mindfulness and contextual performance have an effective role in workplace. Yet, we still know relatively little about the underlying mechanisms that explain the relationship among mindfulness, thriving and contextual performance in a nursing context. METHODS: Data were collected from nurses from various hospitals in Turkey (N = 398). We used the structural equation model to test the mediation model. RESULTS: Empirical results indicate that thriving mediates the link between employee mindfulness and contextual performance. CONCLUSIONS: This study contributes to the existing literature on thriving by explaining the mediating mechanisms through which mindfulness affects contextual performance and provides implications for practitioners by showing that employees with higher levels of mindfulness engage in more extra-role behaviours when their thriving is high. IMPLICATIONS FOR NURSING MANAGEMENT: Managers should pay attention to finding ways to improve mindfulness and thriving in organisations in order to increase nurses' contextual performance.

Occupational Well-Being in Sexual Assault Victims and Survivors.

Purpose: While researchers have established that sexual assault may adversely affect successful employment and academic achievement, little is known about the barriers and facilitators of occupational well-being from the perspective of sexual assault survivors. This study assessed the barriers and facilitators of occupational well-being. Design: Constructivist grounded theory. Method: Digitally recorded, semistructured interviews were used to collect data. Data were collected from 22 adult female sexual assault survivors. Analysis consisted of coding, creation of data matrices, and within and across case analysis. Findings: Theoretical saturation was achieved after interviews with 22 participants. Barriers to occupational well-being were mental health symptoms and diagnoses, substance abuse, inflexible attendance policies, and workplace bullying. Facilitators to occupational well-being were personal coping strategies, and organizational and social support. Conclusions: Sexual assault has significant effects on the occupational well-being of women. The work or academic environment can exacerbate the harms of sexual assault or facilitate healing in sexual assault survivors. To facilitate the occupational well-being of sexual assault survivors, workplaces and academic institutions can adopt a trauma-informed approach, create policies that allow for time off to deal with sequela of sexual assault, implement anti-bullying programs, and make resources for gendered violence available.

Drivers and barriers in the practice of health-specific leadership: A qualitative study in healthcare.

BACKGROUND: Managers have a significant impact on the health and well-being of employees, particularly when the managers lead in a health-specific way and intentionally foster their employees' health. However, the data on contextual and individual factors influencing the practice of health-specific leadership is at present limited. OBJECTIVE: To survey the experiences of healthcare managers with health-specific leadership skills and identify the drivers and barriers in the practice of health-specific leadership. METHODS: Semi-structured interviews were conducted with 51 managers from 18 geriatric-care facilities in Germany, between November 2014 and February 2015. The interviews were analysed through qualitative content analysis. RESULTS: In their reports, managers mentioned several drivers and barriers in the practice of health-specific leadership. These drivers and barriers were found at the leader level, the employee level, and the organizational level. The factors identified relate to the theoretical aspects of health-specific leadership: health value, health awareness, health behaviour, and role modelling. CONCLUSION: For successful practice of health-specific leadership, the findings suggest a more holistic approach for worksite health promotion. Managers should promote personal initiative that benefit employee health, encourage their employees to exhibit healthy behaviour themselves, address organizational resources and restrictions, and gain competencies in change management.

Spiritual leaders can retain nurses.

AIM: To awaken, to alert, to educate and to motivate nurse leaders towards spiritual leadership. BACKGROUND: Government restructuring has resulted in nursing layoffs, high nurse to patient ratios and reduced professional support. As a result, nurses can experience negative psychological effects which can result in nurses choosing to leave the profession. METHODS: The majority of spiritual leadership literature is reflective of Fry's Spiritual Leadership Theory; thus, available research evidence pertaining to spiritual leadership was utilized for this commentary. RESULTS: Frontline nurses desire spiritual leaders and cultures built upon altruistic love. Nurse leaders must be alerted to workplace spirituality and must be motivated to apply spiritual leadership. Spiritual nurse leaders must value the qualities of spiritual leadership to create solid visions and cultures based on altruistic love to retain nursing staff. CONCLUSION: Spiritual leadership is evidenced to increase retention while improving the psychological well-being of individual health. To rebuild the nursing culture and to retain frontline nurses, nurse leaders must feel motivated to incorporate spirituality in the workplace by implementing spiritual leadership. IMPLICATIONS FOR NURSING MANAGEMENT: Strategies are recommended to assist nurse leaders in creating a culture of altruistic love and to attain a meaningful inner life through self-assessment, self-awareness and self-compassion.

The daily routine of nurses in rural areas in the Family Health Strategy.

OBJECTIVE: to analyze the daily work of rural Family Health Strategy (FHS) nurses. METHOD: a qualitative, descriptive and exploratory research. The data were collected with eleven rural nurses of the city of Campina Grande, Paraíba State, through semi-structured interviews, between January and March of 2017, using Content Analysis. RESULTS: rural nurses have a strong relationship with the population. However, they reveal a daily work with various organizational barriers that range from the team displacement to the workplace to the operationalization of health actions, which are mediated by the characteristics of rurality. Some of these barriers can be remedied by a more proactive action from the management. FINAL CONSIDERATIONS: conditioned by the characteristics of rurality, the differentiated dynamics work reveal weaknesses in the quality of nursing care and lower effectiveness of the FHS.

The daily routine of nurses in rural areas in the Family Health Strategy / El cotidiano de enfermeros en áreas rurales en la Estrategia Salud de la Familia / O cotidiano de enfermeiros em áreas rurais na estratégia saúde da família

ABSTRACT Objective: to analyze the daily work of rural Family Health Strategy (FHS) nurses. Method: a qualitative, descriptive and exploratory research. The data were collected with eleven rural nurses of the city of Campina Grande, Paraíba State, through semi-structured interviews, between January and March of 2017, using Content Analysis. Results: rural nurses have a strong relationship with the population. However, they reveal a daily work with various organizational barriers that range from the team displacement to the workplace to the operationalization of health actions, which are mediated by the characteristics of rurality. Some of these barriers can be remedied by a more proactive action from the management. Final considerations: conditioned by the characteristics of rurality, the differentiated dynamics work reveal weaknesses in the quality of nursing care and lower effectiveness of the FHS.

RESUMEN Objetivo: analizar el cotidiano de trabajo de enfermeros de la Estrategia Salud de la Familia (ESF) que actúan en áreas rurales. Método: investigación cualitativa, descriptiva-exploratoria. Los datos fueron recolectados con once enfermeros del área rural del municipio de Campina Grande-PB, a través de entrevistas semiestructuradas, entre enero y marzo de 2017, con análisis a partir del Análisis de Contenido. Resultados: los enfermeros de las áreas rurales tienen relación de vínculo intensa con la población. Sin embargo, revelan un cotidiano de trabajo con varias barreras organizacionales que van desde el desplazamiento del equipo al lugar de trabajo a la operacionalización de las acciones de salud, siendo estas mediadas por las características de la ruralidad. Algunas de esas barreras pueden ser sanadas por la acción más propositiva de la gestión. Consideraciones finales: la dinámica de trabajo diferenciada, condicionada por las características propias de la ruralidad, revelan fragilidades en la calidad de la asistencia de enfermería y menor efectividad de la ESF.

RESUMO Objetivo: analisar o cotidiano de trabalho de enfermeiros da Estratégia Saúde da Família (ESF) que atuam em áreas rurais. Método: pesquisa qualitativa, descritiva-exploratória. Os dados foram coletados com onze enfermeiros da área rural do município de Campina Grande-PB, por meio de entrevistas semiestruturadas, entre janeiro e março de 2017, com análise a partir da técnica de Análise de Conteúdo. Resultados: os enfermeiros das áreas rurais têm relação de vínculo intensa com a população, no entanto, revelam um cotidiano de trabalho com várias barreiras organizacionais que vão desde o deslocamento da equipe ao local de trabalho à operacionalização das ações de saúde, sendo essas mediadas pelas características da ruralidade. Algumas dessas barreiras podem ser sanadas pela ação mais propositiva da gestão. Considerações finais: a dinâmica de trabalho diferenciada, condicionada pelas características próprias da ruralidade, revelam fragilidades na qualidade da assistência de enfermagem e menor efetividade da ESF.

Relationship between burnout and intention to leave amongst clinical nurses: The role of spiritual climate.

AIM: This study aims to identify the role that spiritual climate has in reducing burnout and intentions to leave amongst clinical nurses. BACKGROUND: Both shortages and the high turnover of nurses are challenging problems worldwide. Enhancing the spiritual climate amongst nurses can enhance teamwork, organisational commitment and job satisfaction and can play a role in reducing burnout and turnover intention. METHODS: A total of 207 clinical nurses working at a tertiary university hospital were included in this cross-sectional, single-site study. Independent-samples t test and ANOVA, Pearson correlation analysis and hierarchical regression analysis were used to explore the relationships amongst related factors. RESULTS: Most clinical departments showed a moderate spiritual climate (60.24 ± 0.82) with high job burnout (33.62 ± 0.28) and turnover intention (2.37 ± 0.57). A good spiritual climate was correlated with high job satisfaction (r = 0.412, p < 0.01), low burnout and turnover intention (r = -0.423, p < 0.01 and r = -0.292, p < 0.01, respectively). Spiritual climate could also indirectly influence nurses' job burnout and turnover intention (R2  = 10.31%). CONCLUSIONS: Different departments have different spiritual climates. The findings from this study indicate that spiritual climate may impact nursing burnout and turnover. IMPLICATIONS FOR NURSING MANAGEMENT: Using a spiritual climate scale provides health care decision-makers with clear information about staff spirituality well-being. Interventions to improve spiritual climate can benefit teamwork in clinical departments.

The nurse work environment in Spanish nurses following an economic recession: From 2009 to 2014.

AIM: To detect possible changes in perception of the nurse work environment, job satisfaction and burnout between the years 2009 and 2014 among nurses working in the Spanish National Health System. BACKGROUND: The global economic crisis has had a great impact on nurses in the Spanish National Health Service: tougher working conditions, lower pay and a reduction in social benefits. It is not known whether these changes affect the nurses' work environment, job satisfaction and burnout. METHOD: Comparative, cross-sectional study performed in seven hospitals in the Spanish National Health System between 2009 and 2014, through 1,454 surveys of nurses working in internal medicine, surgery and intensive care. RESULTS: Nurses participating in the second period (2012-2014) were more satisfied with their current job (p = 0.001), perceived their work environment to be more favourable (p < 0.001) and had lower levels of burnout (p < 0.01). Professional factors as 'autonomy at work,' 'opportunities for advancement,' 'professional status' and 'nursing foundations for quality care,' as well as 'collegial nurse-physician relations' and 'nurse participation in hospital affairs' were the most important variables associated with these topics. CONCLUSIONS: Professional factors may influence these changes more than labour conditions and remuneration aspects. IMPLICATIONS FOR NURSING MANAGEMENT: In times of economic recession, encouraging interpersonal relationships, autonomy and participation in decision-making may improve the work environment, satisfaction and burnout of nurses.

Demands for multidimensional information on the work environment: A methodological framework for regular studies.

BACKGROUND: Development of methodologies for making economic decisions on designing work environment studies is a theoretical challenge for researchers in occupational health sciences. There are well-defined tools available in the relevant literature for analysis of cost-efficiency associated with the assessment of an occupational exposure of interest. However, these analytical tools are not appropriate for holistic studies of the work environment as a multidimensional reality. OBJECTIVE: This article introduces an appropriate methodology for designing cross-sectional comprehensive studies of the work environment, in order to optimize the production of information on the psychosocial, ergonomic, and physical dimensions of the work environment in regular studies. METHODS: The employment of a translog cost-utility function is suggested as a suitable way to provide cost-minimized designs for regular studies which are aimed at providing or developing multidimensional information systems of the work environment. RESULTS: The translog cost-utility function is not subject to predetermined restrictions, but has a flexibility property allowing it to be transformed to any specification that is adaptable to the specific work environmental characteristics and research requirements. CONCLUSION: The translog cost-utility function is an appropriate econometric model for optimizing the production of multidimensional information on occupational exposures in regular cross-sectional workplace studies.

Effectiveness of nursing rounds in the Intensive Care Unit on workplace learning.

OBJECTIVES: To evaluate the implementation of a regular Nursing Round as an educational strategy for workplace learning in an intensive care unit with a single room environment. RESEARCH DESIGN: A multiple methods design was used. Fifty-four Nursing Rounds were observed and nurses (n = 40) completed bespoke evaluative surveys. Structured observational data and open-ended survey responses were submitted to content analysis and descriptive statistics were used to analyse survey findings. RESULTS: Nursing Rounds involved a diverse range of participants, most frequently nurses. The content most frequently discussed included empirical clinical issues where nurses decided on nursing care actions to address these issues. The most frequently observed outcome of Nursing Rounds was knowledge translation. Nursing Rounds were perceived to positively influence application of evidence in practise, identification of areas for practise improvement and ability to communicate clinical information. Two categories emerged from analysis of open-ended survey questions; (1) 'Positive learning environment', where nurses described Nursing Rounds as a social learning experience; and (2) 'Impediments to Nursing Rounds', including difficulty attending Nursing Rounds due to competing priorities. CONCLUSION: Nursing Rounds enabled evidence-based learning that enhanced inter-disciplinary collaboration. Further investigation may be required to understand how to enable nurses to attend more frequently, and generate a more holistic, evidence-based discussion.

ACD3 as a framework for design of ergonomic workplaces.

BACKGROUND: Workplace Ergonomics and Human Factors (E/HF) remains as relevant and important as ever to respond to contemporary workplace design challenges. Therefore, E/HF expertise must be involved in early and appropriate phases of the workplace design process, in order to leverage user needs and requirements to constrain the proposed design solution. In this process, design decisions are made. OBJECTIVE: The aim of this article is to describe the use of a systems-theoretical framework as a guide in collaborative workplace design, focussing on planning and documenting which decisions and activities should involve E/HF expertise. METHODS: As this is a conceptual paper, its method is to synthesise a framework from a combination of design process methodology-, general systems theory- and sociotechnical systems literature. RESULTS: The framework organises the design decisions to be made into hierarchical abstraction levels and cross-cuts them into five perspectives from which the design problem can be viewed holistically. CONCLUSIONS: The ACD3 framework is intended as an enabler of many types of design, including the design of work systems. It provides a framework that allows all stakeholders to converge around design decisions that ensure that the work system is optimised to human characteristics and the activity to be performed.