Empirical Research on Decent Work: A Literature Review

Introduction In the last two decades, economic transformations have led to changes in the labour market and the flexibilization of labour relations (Standing, 2013; ILO, 2002). The economic crisis of 2008–2009 accentuated this tendency further by increasing unemployment, long-term unemployment, informal work, underemployment, flexible contracts, and precarious employment (ILO, 2001a, 2009, 2015). If, on the one hand, globalization has created great economic opportunities, on the other hand, it has contributed to the increase of social inequalities (ILO, 2001a). In this context, the concept of decent work (DW) emerges as an institutional effort to combat the degradation of the labour market (Ferraro, Dos Santos, Pais and Mónico, 2016b). The concept of DW has evolved since the International Labour Organization (ILO) was founded in 1919, as part of the Treaty of Versailles, in order to respond to international labour policy issues (Ferraro et al., 2016b; Treaty of Versailles, 1919). It was first defined by the ILO in 1999 (ILO, 1999) as the sum of people’s ‘aspirations for opportunity and income; rights, voice and recognition; family stability and personal development; and fairness and gender equality’ (ILO, 1999: 3). The development of DW received several contributions throughout the ILO’s history and the United Nations action, being the eighth objective of the United Nations 17 Sustainable Development Goals (ILO 1944; United Nations 2000a, 2000b, 2015). The historical landmarks of DW show the high legitimacy of the concept as a research subject and as an aim to be pursued by social agents (Dos Santos, 2017). It was originally conceptualized by the more global international forum which represents the world as a whole (Ferraro et al., 2016b). The fundamental aim of the ILO is the achievement of ‘decent work and productive work for women and men in conditions of freedom, equity, security and human dignity’ (ILO, 2008a: 2). These four main values are expressed through four strategic objectives: i) the promotion of standards and fundamental principles and rights at work, to ensure that workers’ constitutionally protected rights to dignity, equality and fair labour practices are protected by appropriate legal frameworks; ii) the promotion of employment creation and income opportunities, with the goal being ‘not just the creation of jobs, but the creation of jobs of acceptable quality’; iii) the access to and improvement of social protection and social security, which is fundamental to the reduction of poverty, inequality, and the problem of care responsibilities; and (iv) the promotion of social dialogue (ILO, 1999, 2001a, 2008b). Several concepts are closely related to these objectives, such as unemployment, work-life balance, career management, worker participation and compensation systems, to name but a few. Each of these concepts has a specific contribution to decent work and, taken together, form a valuable compass to guide the actions of social, economic and political agents. However, researching each dimension per se is insufficient to take stock of labour issues because the interactions among the several ORIGINAL ARTICLE


Introduction
In the last two decades, economic transformations have led to changes in the labour market and the flexibilization of labour relations (Standing, 2013;ILO, 2002). The economic crisis of 2008-2009 accentuated this tendency further by increasing unemployment, long-term unemployment, informal work, underemployment, flexible contracts, and precarious employment (ILO, 2001a(ILO, , 2009(ILO, , 2015. If, on the one hand, globalization has created great economic opportunities, on the other hand, it has contributed to the increase of social inequalities (ILO, 2001a). In this context, the concept of decent work (DW) emerges as an institutional effort to combat the degradation of the labour market (Ferraro, Dos Santos, Pais and Mónico, 2016b).
The concept of DW has evolved since the International Labour Organization (ILO) was founded in 1919, as part of the Treaty of Versailles, in order to respond to international labour policy issues (Ferraro et al., 2016b;Treaty of Versailles, 1919). It was first defined by the ILO in 1999(ILO, 1999 as the sum of people's ' aspirations for opportunity and income; rights, voice and recognition; family stability and personal development; and fairness and gender equality' (ILO, 1999: 3). The development of DW received several contributions throughout the ILO's history and the United Nations action, being the eighth objective of the United Nations 17 Sustainable Development Goals (ILO 1944;United Nations 2000a, 2000b. The historical landmarks of DW show the high legitimacy of the concept as a research subject and as an aim to be pursued by social agents (Dos . It was originally conceptualized by the more global international forum which represents the world as a whole (Ferraro et al., 2016b).
The fundamental aim of the ILO is the achievement of ' decent work and productive work for women and men in conditions of freedom, equity, security and human dignity' (ILO, 2008a: 2). These four main values are expressed through four strategic objectives: i) the promotion of standards and fundamental principles and rights at work, to ensure that workers' constitutionally protected rights to dignity, equality and fair labour practices are protected by appropriate legal frameworks; ii) the promotion of employment creation and income opportunities, with the goal being 'not just the creation of jobs, but the creation of jobs of acceptable quality'; iii) the access to and improvement of social protection and social security, which is fundamental to the reduction of poverty, inequality, and the problem of care responsibilities; and (iv) the promotion of social dialogue (ILO, 1999(ILO, , 2001a(ILO, , 2008b. Several concepts are closely related to these objectives, such as unemployment, work-life balance, career management, worker participation and compensation systems, to name but a few. Each of these concepts has a specific contribution to decent work and, taken together, form a valuable compass to guide the actions of social, economic and political agents. However, researching each dimension per se is insufficient to take stock of labour issues because the interactions among the several the different social security systems (Ghai, 2003b); (c) the different labour markets (Godfrey, 2003); (d) the different instruments and sources of each country (Ahmed, 2003;Bescond, Châtaignier and Mehran, 2003;Bonnet, Figueiredo and Standing, 2003); (e) the diversity of working conditions; and (f) the high interdependence between countries (Ferraro, Pais and Dos Santos, 2015). These limitations negatively affect the accuracy of information, on the one hand, making cross-country comparisons difficult (Anker et al., 2002) and, on the other hand, making it difficult to create a single index of Human Development (Anker et al., 2002;Godfrey, 2003). Furthermore, the individual level of analysis is almost absent from the existing measures (Ferraro et al., 2016b). Individual-level analysis complements these measures by considering workers' perceptions about DW in their work context. The WOPP approach makes that unique contribution bringing new knowledge to the understanding of DW. Knowing that a specific DW dimension is rated as high by workers from different countries might not mean that all of them have the same objective conditions, but that they perceive their own conditions in that dimension as high. Cultural aspects and economic conditions in different countries can justify possible differences between objective measures and subjective ones. Accurate knowledge of that possible dissemblance is relevant for theoretical development and for policy makers, practitioners in human resource management and others.
Although some previous research in work, organizational, and personnel psychology has found important results for deeper understanding of the DW concept and its nomological network, the empirical research on the concept as a whole has not been subject to a literature review so far. Considering the concept as a whole allows us to see more accurately the interactions among the various dimensions of DW and relate the DW condition with other constructs that are relevant to people, as mentioned above. Furthermore, the scientific endeavour is both an analytical process that decomposes the components of the phenomena and necessary to integrate the partial findings regarding the components to reach understanding of the phenomena as a whole. The present study intends to fill this gap, producing an overview of the general findings of the empirical studies found in several databases.

Aim
The 'DW' expression was coined by the ILO, which gives it high legitimacy as the subject of research. The present study aimed to deepen our understanding of the concept through describing the state-of-the-art empirical research on DW (using the label 'DW') from a psychological perspective or related fields.

Literature search
The studies relevant to this empirical research were identified by comparing the entries from two electronic databases: B-On (Complementary Index, Academic Search Complete, ECONIS, Business Source Complete, MEDLINE, RCAAP, Supplemental Index, Scopus) and the EBSCO host (Academic Search Complete, Business Source Complete, MEDLINE, Health Business Elite, Regional Business News, ERIC, Library, Information Science & Technology Abstracts, Psychology and Behavioral Sciences Collection, MedicLatina, SPORTDiscus), to the end of December 2017. A targeted search was conducted using the keywords ' decent work' in the title AND ' decent work' in the abstract. We did not impose a time limit on the studies included since DW is a relatively new research topic. This search, limited to the English language, yielded 689 citations of which 497 were bibliographic citations from the B-On and 192 from the EBSCO. Some of the databases are clearly in the realm of psychology (for instance: Psychology and Behavioural Sciences Collection), but others are only partially within it. Since the various dimensions of DW have strong research traditions in law, management, sociology, and other related disciplines, this literature review includes databases within the wider scope of social sciences. We have chosen to include the word 'psychology' in the field ' all text' as a criterion for retrieving studies with any relationship with psychology.

Inclusion and exclusion criteria applied in the retrieval process
This review concerned studies that 1) were published as articles in academic journals and 2) reported the results of empirical studies. A citation was excluded if 1) it was a book review, 2) it was a book or chapter, or 1) no empirical data was reported.

Retrieval of the studies for the review
The retrieval process was conducted systematically in two phases. In the first phase the 689 abstracts were examined against the inclusion and exclusion criteria. Two researchers worked independently on the first phase of the review focusing on the title and abstract of the studies. The researchers discussed their independent results and together decided on those abstracts to be analysed further. Based on the abstract, a total of 132 possible studies met the inclusion/exclusion criteria and were included in the second phase of analysis. The remaining 557 were excluded from the review. In the second phase, the full texts of the retrieved 132 studies were acquired. Three researchers examined the articles independently, judging them against the inclusion and exclusion criteria. Final inclusion or exclusion was confirmed by the whole research group. During this phase, a total of 94 articles were deleted because they were not empirical studies. This left 38 eligible scientific research articles for the review.

Analysis of the studies
Information collected from each of the studies included the author(s), year and country of publication, the aim of the study, the main concepts under investigation, the method (research design, data collection, and analysis methods), the settings, and the sampling method. Additionally, information was gathered about the main results. This information was systematically collected on a worksheet, designed for this study, and used as data for this review. During data collection, the original terms used in the studies were kept and no interpretations were made.

Focus and topics
The first of the reviewed studies focusing on DW was published in 2003 (Table 1). Research into DW clearly increased in 2016. The earliest studies on the topic were concerned with DW indicators, human development, and economic growth. We have identified many topics related to DW ( Table 2). The studies focused on DW indicators, DWA, DW deficit, human development, economic growth, gender differences, gender equality, employment promotion, tourism employment, immigrants' employment situation, women's employment, self-employment, working conditions, quality of work life, precarious work, good work, national culture, career counselling, global production network, sexual minorities, and quality of working life.
The first instrument to measure DW appeared in 2015; another was published in 2016 and another in 2017. In 2017, DW appears related to very topical themes such as work motivation, psychological capital, sexual discrimination, and quality of working life.

Informants and settings
Study samples are quite diverse (see Table 2). In 10 studies the sample was gathered from statistical data bases of institutional sources. In 17 studies the sample was workers from different professional categories. The groups studied were households and individual workers, clothing industry workers, local authority staff, representatives of employers' associations and workers' unions, street vendors, tourist guides, unionized hotel workers, information and communication technology (ICT) sector employees, industries -private security, agriculture and hospitality -migrant domestic workers, automotive industry, unionized firm workers, knowledge workers, migrant construction labourers, urban workers, employed sexual minority adults, workers from the food and beverage industry, employed adults, and strippers.
Two studies use students as their sample and two studies use as a source of information the ILO, World Health Organization and World Bank data. One study   In terms of location, twenty-four studies include data from just one country. Six studies include data from a large number of countries (transnational), five studies collected data in two countries, and three operated in global institutions.

Study method
Most studies were cross-sectional and either descriptive or/and correlational. Three studies are case studies and six are based on mixed methods (see Table 2). The most common method of data collection in the reviewed studies was the interview, used in 13 studies, followed by data, used in 11 studies and the ad-hoc questionnaire used in eight studies. Data were also collected from documents (six studies), literature survey (three studies), narratives (two studies), and participant observation (two studies). Only one study used the focus group for data collection. The Decent Work Questionnaire was used in two studies, one being the instrument's development. The Decent Work Scale was also used in two studies, one being the instrument's development. One diagnostic tool of DW was developed.
The most common analysis method was content analysis, used in 13 studies, followed by statistical analysis, used in eight studies, descriptive analysis used in six studies and documental analysis used in five studies. Four studies do not give information about the data analysis method. Two studies use thematic analysis, two studies use discourse analysis, one study uses cross-cultural analysis, one study uses regression analysis and one study uses logistic regression. Two studies use a specific method of analysis (Hans Böckler Foundation method and Data Envelopment analysis).
Most studies (25) are descriptive (Table 3). In four studies DW was related with other variables (Pearson's r correlations, hierarchical regressions, regression analysis, and logistic analysis). In one study DW is an independent variable, and it is a dependent variable in another.

Main findings of the reviewed studies
The descriptive studies found in the literature review used several indicators to describe DW. Some of them refer to countries, and 55 indicators were used in those studies ( Table 4). In general, the studies indicate a DW deficit in those countries and the challenges to meet the DW goals.
Concerning sector of activity, the authors used 35 indicators to describe DW ( Table 5). In general, they highlight the need to overcome the DW deficit existent in those sectors of activity.
Concerning the studies examining discourse and policy on DW from international organizations and governments, differences were found between institutions. Bletsas and Charlesworth (2013) reported that DW is a contested concept in the sense that the commitment to DW does not always reflect the commitment to gender equality. Di Ruggiero, Cohen and Cole (2014) reported that the pursuit of DW is an important and fundamental goal to promote fair policies, and that the ILO is refining the global policy about work on United Nations agencies.
Later, Di Ruggiero, Cohen, Cole and Forman (2015) reported that DW is a contested notion and that different institutional perspectives are shaping DW in economic, social, and/or health terms. Kelkar and Yunxian (2007) reported deficits of DW and gender equality in pursuit of inclusive and fair growth and that growth opportunities for men and women depend on the integration of dignity and equality as a crucial factor of the economic environment and institutional conditions. Charlesworth and Macdonald (2015) reported that developed countries argue that the DWA is more meaningful for developing economies and that this idea may be due to the perceived lack of relevance of the DWA in Other Duffy et al., 2017;Ferraro et al., 2016d;Gil et al., 2008;Lawrence et al., 2008;Pouyaud, 2016 those developed countries. The challenge in the developed countries is to overcome the minimum standards of work and inclusion of gender for the promotion and gender equality (Charlesworth and Macdonald, 2015). Sehnbruch, Burchell, Agloni and Piasna (2015) reported that the fundamentals and theoretical development are key factors for the success of DW and human development, because they are factors that facilitate the operationalization of these concepts. Ribeiro, Silva and Figueiredo (2016) reported that urban workers in Brazil seek work with fair wages, social protection, safety, and personal development opportunities, as recommended by the ILO, but these principles, in contexts of economic vulnerability, come  from the community and not from the State, which creates different forms of DW. Simonova, Sankova, Mirzabalaeva, Shchipanova and Dorozhkind (2016) analysed existing approaches to the assessment of DW and developed a model which overcomes the DW deficit through structural and institutional changes. In general, since DW is a comprehensive and integrative construct, it allows some appropriation by the different institutions that emphasize the components of the concept (Simonova et al., 2016).
Concerning the scientific fields of research on DW, Pouyaud (2016) reported that the field of vocational psychology deals with the need for a multilevel, psychosocial perspective, taking into account both objective and subjective dimensions of DW, and four levels are highlighted in defining DW: (1) Personal Level (Life Story); (2) The Level of Activity (Work as Concrete Action); (3) Collective Level (Interaction with Peers); and (4) Social Level (Values). In this case study, the author characterizes the extent to which a professional's practices express the concept of DW.
Regarding development of psychological measures, three instruments were developed Ferraro et al., 2016d;Webster, Budlender and Orkin, 2015). Regarding DW determinants, three studies were found (Ahmed, 2003;Douglass, Velez, Conlin, Duffy and England, 2017;Pedraza, González and Llorente, 2012). Douglass et al. (2017), using the DW concept of the Psychology of Working Theory (PWT; Duffy et al., 2016), found that heterosexist discrimination and social class directly predicted DW. These results, although relevant, reveal what was expected because heterosexist and social class non-discrimination are components of the DW concept as described by the ILO.
Using the composite index of DW deficit (combining indicators of low hourly pay, excessive working hours, unemployment, non-enrolment in school, youth unemployment, male-female gap in labour force participation and old age without a pension) and the Human Development Index in 38 countries, Ahmed (2003) reported that high levels of DW can be achieved without high incomes and that high incomes do not guarantee high levels of DW. Pedraza et al. (2012) reported that, in a negative economic context, early immigrants to a country are more likely to achieve full-time DW, while those who enter later are more likely to find part-time jobs with a DW deficit.
Concerning the impact of DW, only one study refers to this (Ferraro, Pais, Moreira and Dos Santos, 2017). Using a sample of knowledge workers from Portugal and Brazil, the authors reveal that DW plays an important role in promoting a positive approach to work, and that psychological capital is an important mediating variable in the promotion of autonomous work motivation. Moreover, DW has a relevant role as a predictor of different types of work motivation through PsyCap mediation.
Finally, two studies use the DW just for contextualizing research focused on other variables (Di Fabbio and Bucci, 2016;Di Fabio and Kenny, 2016). Di Fabbio and Bucci (2016) revealed that the connection to nature, on the one hand, is not related to fluid intelligence and, on the other hand, has a moderate relation with the personality traits. Di Fabio and Kenny's (2016) study provides empirical support for the conceptualization of positive self and relational management (PS and RM) as positive lifelong life-management, positive lifelong self-management, and positive lifelong relational management. The authors seek to identify variables that will allow students to have a decent life and DW. Therefore, the relationship of these last studies reported is very distal.

Discussion
The scarcity of articles reporting empirical studies on DW published so far shows that the subject is still in its early stages of development, mainly in psychology. Furthermore, among these articles just a few address the DW concept as a whole. Most studies consider only some DW components measured by indicators or other measures ( Table 6). That is remarkable because one of the merits of this concept is its integrative and comprehensive nature. One of its strengths is its capability to join together dispersed research that has been undertaken in several fields and perspectives for many years . Approaching only part of the full concept prevents one of its strongest contributions to knowledge development and policy design and implementation. Only an approach that first considers the concept as a whole gives credence to a more detailed look at one of its dimensions. The DW concept allows us to see the big picture and, through its dimensions, to see the accurate relationships between the different dimensions of the concept. Moreover, DW enables the inclusion in the same picture of many disperse studies that separately have contributed to the field. A more comprehensive understanding of workrelated constructs became easier.
The descriptive studies apply different indicators and report mostly DW deficits. When using indicators by country, it is implicitly assumed that the country has a problem ( Table 6; Tangian, 2009). However, the huge interdependence brought about by globalization means it is not enough to consider that the country where the DW deficit occurs is the owner of the problem and solely responsible for it. That problem is the result of complex interaction between the various players in the scenario. It seems more accurate to consider that a DW deficit, whenever it occurs, is a world DW deficit and should be approached accordingly (Dos Santos, Pais and Ferraro, 2016;Ferraro et al., 2015). Therefore, policy makers, researchers, and practitioners have to approach the DW deficit as a world problem whenever it occurs, and this requires a wide understanding of the complex interactions between different players. The empirical research undertaken so far lacks an approach to DW as a concept that has to be considered within the great interdependence described. Psychological perspectives that study conditions contributing to people's understanding of that interdependence will be welcome.
The lack of empirical research is further demonstrated by the low number of measures developed ( Table 6). Three psychological instruments were developed to measure DW. While Ferraro et al. (2016d) and Webster et al. (2015) used the ILO definition of DW, Duffy et al. (2017) have a more restricted definition of DW. Future research can both verify to what extent the current instruments show adequate psychometric properties in more diverse samples and undertake validation studies in other countries.
Although there are some correlational studies, the explanatory power of the effects of different determinants on DW is also largely absent from the literature ( Table 6). The review found reports of some associations, for example, between DW and economic development and human development. The relationship between these concepts is important since the impact of countries' industrialization and income on DW has been reported (Ahmed, 2003;Bescond et al., 2003). However, the current evidence about relationships between concepts is sparse and based on reviews and descriptive and single correlation studies and can only be considered as preliminary evidence. There is also a need for closer examination of the determinants in relation to DW, as these have been found to impact employment situations and may affect the achievement of DW (Pedraza et al., 2012).
Regarding the descriptive component, the studies reviewed here were conducted in countries, using indicators that describe what happens in those countries or in specific groups. Although many different workers have already been studied, that diversity is far from covering the full diversity of the labour market. That is even truer regarding workers' perspectives on DW. Therefore, research on DW from different worker perspectives is an important topic for future research. With regard to the diversity of countries, studies were made in many different countries where the DW deficit is high.
According to the Human Development Index ranking, 40 of the countries studied show a very high human development (out of 51), 23 are in the category of high Assumption that if a country reports DW deficit that country has a problem Take into account the interdependence brought by globalization and always approach DW deficits as world problems.
DW deficit, whenever it occurs, is a world DW deficit.
The extant psychological measures of DW were applied in a small number of countries and in a narrow span of worker diversity.
Validate these instruments in diverse samples (from several countries and including worker diversity).
The psychological measurement of DW is useful for knowledge development and practical improvements in the labour field.

Absence of the effects of different determinants on DW
Examine the determinants in relation to DW namely in terms of psychological variables more closely.
The study of the nomological network of the DW concept is relevant for knowledge development and practical improvements in the labour field (DW as criterion variable).

Absence of research on different impacts of DW
Develop studies on the DW impact.
The study of the nomological network of the DW concept is relevant for knowledge development and practical improvements in the labour field (DW as predictor variable).

Countries' diversity is under-researched so far
Expand empirical research to different countries worldwide.
DW has some cultural diversity in the way it is expressed, which is relevant to study both for knowledge development and practical improvements.
human development (out of 53), 15 present a medium human development (out of 40), and the last 4 countries (out of 40) are in the category of low human development. Therefore, most countries subject to research are in the very high or high human development levels ( Table 6).
One possible explanation can be drawn: The countries in those categories are more researched because of their investment in research. Researchers who work in those countries study mainly data from their own countries. They have greater access to data, and research funding policies reinforce their focus on the countries that pay the bill. Moreover, the cultural environment where they live is better known by them than the cultural environments of low and medium human development countries, and they prefer to study what is guaranteed instead of taking risky options. This hypothesis should be tested in further studies and if confirmed should indicate a need for more investment in research in medium and low human development countries. This implication is more pertinent when considering the great interdependence regarding conditions that lead to the above-mentioned DW deficits. Moreover, in low development countries the DW deficit symptom is expected to be more prominent than in more developed countries. Confirmation of that situation should encourage both researchers and policy makers to undertake research on DW deficit in developing countries.
In addition, the DW deficit seems to be a problem that emerges regardless of the position of the country in the Human Development Index. It seems to be a worldwide symptom as a result of complex interactions between players. Tracking the chains of production and use of products and services worldwide can be relevant in identifying how the DW deficit is caused and provide crucial information for tackling the problem and inspiring paths to solve it. That endeavour should be an important task in future research and intervention.
Since the empirical studies in this review focused on only a few topics related to DW, it is not possible to draw firm conclusions about the main results (Table 6). However, there is some evidence that DW is associated with different types of work motivation through PsyCap mediation and that DW characteristics are highly motivating for workers (Ferraro et al., 2017).
Social science is still taking the first steps in approaching the DW concept as a whole. However, we can say that there is already a long tradition of research in the various components of DW, taken separately, albeit not within the DW field. Further studies should be concerned with the integration of evidence-based knowledge in explaining and managing DW.

Conclusions
In the present work we undertook a literature review of the empirical studies on DW and found that, being a recent concept, the empirical literature is not very extensive. Of the 38 studies analysed, most are descriptive, covering 82 countries and 17 sectors of activity. Most countries are high or very high in the Human Development Index, which means medium, low, and very low development countries are under-researched. There is a need to broaden the scope of occupations and contexts covered by research in line with the DW agenda.
Additionally, most studies are found not to cover the whole DW concept. Being an integrative concept, this limitation should be addressed in future research. Taking the full range of the concept into account will improve the contribution of the research on DW and its dissemination throughout the world.
Considering that DW is a concept with value per se, future study of its determinants seems to be more relevant than its consequences. These determinants are multiple and their identification will contribute to enriching the nomological network of the concept and mainly to designing interventions to promote DW.
Considering the aforementioned interdependence resulting from globalization, the need to study the roles played by the different stakeholders, whether outside or inside organizations, seems also relevant. Furthermore, only a few studies were dedicated to the DW impact, but none have considered the impact on the different spheres of workers' lives (e.g., family, friends) or on society in general. These are also aspects that should be studied in the future.
Three instruments were identified for psychological measurement of DW. Validation of this type of instrument for use in culturally diverse countries would enhance current knowledge and understanding of DW, considering both objective and subjective measures of the concept. Furthermore, despite the difficulties anticipated in applying this type of measure, it will still be relevant to develop and validate a tool focused on the organizational level of analysis. It is remarkable that no research has focused on studying possible differences between cultures or sectors of activity regarding the most relevant dimensions of DW and the least important dimensions at a specific point in time. Further studies can address this topic.
Given that the number of empirical studies on DW is very small, we decided not to consider as exclusion criterion ethical standards or quality. This decision was taken considering that all the studies were published in academic journals with peer review assessment and the assessment of quality and ethical standards was previously undertaken before being accepted for publishing. However, future literature reviews might use additional criteria regarding quality or ethical standards.
The approach presented here is a contribution, among others, that can help to strengthen understanding of the concept and its nomological network. That understanding might help people (e.g., workers, employers, policy makers) to be aware of what they are making of their working lives and, above all, what they can do differently to achieve a better quality of life for themselves and others. The differences between objective measures and subjective perceptions seem to be very important in studying the phenomena related to work and the role it represents for people currently and in the future. Work as a social institution should always be considered as DW instead of only focusing on performance and outputs, otherwise work seems to be an alienation of the subject. Human resource managers are advised that work design and human resource practices and policies have to be updated taking into account the evolving nature of the DW concept, as highlighted by Ferraro et al. (2015). Those practices and policies that are against any of the DW dimensions are not sustainable and have expected negative consequences. The definition of DW deficits, its measurement, and subsequent intervention have to take into account an appropriate time frame to detect to what extent the DW deficit is just a short and episodic moment or more long-lasting and requires corrective action, as highlighted by Dos Santos et al. (2016).
In general, DW has the potential to become a more relevant concept in research and intervention. That can be true if an effort is made to join the diverse research traditions in several disciplines, thereby contributing to deepening understanding of the concept.

Ethics and Consent
This article does not contain any studies with human participants performed by any of the authors.

Funding Information
This study was funded by SFRH/BD/130894/2017.

Competing Interests
Authors contributed equally and significantly to the study and there is no conflict of interest.